Patent Publication Number: US-2021169884-A1

Title: Alpha polyglutamated raltitrexed and uses thereof

Description:
BACKGROUND 
     This disclosure generally relates to alpha polyglutamated raltitrexed compositions, including delivery vehicles such as liposomes containing the alpha polyglutamated raltitrexed compositions, and methods of making and using the compositions to treat diseases including hyperproliferative diseases such as cancer, disorders of the immune system such as rheumatoid arthritis, and infectious diseases such as HIV and malaria. 
     Raltitrexed (-(5-[N-(3,4-dihydro-2-methyl-4-oxoquinazolin-6-ylmethyl)-N-methyl-amino]-2-thenoyl)-L-glutamic acid) is the anti-metabolite active ingredient in TOMUDEX® (raltitrexed injection). Raltitrexed is a quinazoline folate analogue having a molecular formula of C 21 H 22 N 4 O 6 S and a structural formula as follows: 
     
       
         
         
             
             
         
       
     
     TOMUDEX® (raltitrexed) is indicated in the treatment of advanced colorectal cancer. It has shown single agent activity in a variety of solid tumors, and may have potential use in mesothelioma, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer and gastric cancer. 
     Raltitrexed (RTX) has potent inhibitory activity against the enzyme thymidylate synthase (TS). Compared to other antimetabolites such as 5-Fluorouracil or methotrexate, raltitrexed acts as a direct and specific TS inhibitor. TS is a key enzyme in the de novo synthesis of thymidine triphosphate (TTP), a nucleotide required exclusively for deoxyribonucleic acid (DNA) synthesis. Inhibition of TS leads to DNA fragmentation and cell death. 
     Folate is an essential cofactor that mediates the transfer of one-carbon units involved in nucleotide biosynthesis and DNA repair, the remethylation of homocysteine (Hcy), and the methylation of DNA, proteins, and lipids. The only circulating forms of folates in the blood are monoglutamates and folate monoglutamates are the only form of folate that is transported across the cell membrane—likewise, the monoglutamate form of polyglutamatable antifolates such as raltitrexed, are transported across the cell membrane. Once taken up into cells, intracellular folate is converted to polyglutamates by the enzyme folylpoly-gamma-glutamate synthetase (FPGS). 
     Raltitrexed is transported into cells via a reduced folate carrier (RFC), by folate receptors (FRs) α and β and by Proton Coupled Folate Transporter (PCFT) that is generally most active in a lower pH environment. RFC is the main transporter of raltitrexed at physiologic pH and is ubiquitously expressed in both normal and diseased cells. It is then extensively polyglutamated by the enzyme folyl polyglutamate synthetase (FPGS) to polyglutamate forms that are retained in cells and are even more potent inhibitors of TS. Raltitrexed polyglutamation enhances TS inhibitory potency and increases the duration of TS inhibition in cells which may improve antitumor activity. Polyglutamation could also contribute to increased toxicity due to drug retention in normal tissues. 
     Raltitrexed is thought to exert its pharmacological effect primarily through inhibition of TS. Consequently, raltitrexed treatment often suffers from the dose-limiting toxicity that is a major obstacle in cancer chemotherapy. Once inside the cell, raltitrexed is polyglutamated by FPGS, which may add up to 6 L glutamyl groups in a L-gamma carboxyl group linkage to the raltitrexed. The L-gamma polyglutamation of raltitrexed by FPGS serves at least 2 main therapeutic purposes: (1) it greatly enhances raltitrexed affinity and inhibitory activity for TS; and (2) it facilitates the accumulation of polyglutamated raltitrexed, which unlike raltitrexed (monoglutamate), is not easily transported out of cells by cell efflux pumps. 
     While targeting folate metabolism and nucleotide biosynthesis is a well established therapeutic strategy for cancer, for RTX, clinical efficacy is limited by a lack of tumor selectivity and the presence of de novo and acquired drug resistance. Like other antifolates, raltitrexed acts during DNA and RNA synthesis, and consequently has a greater toxic effect on rapidly dividing cells such as malignant and myeloid cells. Myelosuppression and gastrointestinal toxicity is typically the dose-limiting toxicity of raltitrexed therapy and has limited the clinical applications of raltitrexed. 
     Resistance to antifolates therapies like raltitrexed is typically associated with one or more of, (a) increased cell efflux pump activity, (b) decreased transport of RTX into cells, (c) increased TS activity, (d) decreased folypolyl-gamma-glutamate synthetase (FPGS) activity, and (e) increased gamma-glutamyl hydrolase (GGH) activity, which cleaves gamma polyglutamate chains attached to folates and antifolates. 
     The challenge to the longstanding (&gt;30 years) observation that higher-level polyglutamates of various antifolates have much greater potency compared to lower-level glutamates, has been that the scientific community has relied on the intracellular FPGS mediated mechanisms to convert the lower-level glutamates to their higher-level forms. The present inventions provide the means to deliver higher-level polyglutamate forms of antifolates directly into the cell, without having to rely on the cells machinery to achieve this goal. 
     The provided alpha polyglutamated raltitrexed compositions deliver a strategy for overcoming the pharmacological challenges associated with the dose limiting toxicities and with treatment resistance associated with raltitrexed therapy. The provided methods deliver to cancer cells a novel alpha polyglutamated form of raltitrexed while (1) minimizing/reducing exposure to normal tissue cells, (2) optimizing/improving the cytotoxic effect of raltitrexed-based agents on cancer cells and (3) minimizing/reducing the impact of the efflux pumps, and other resistance mechanisms that limit the therapeutic efficacy of raltitrexed. 
     BRIEF SUMMARY 
     This disclosure generally relates to novel alpha polyglutamated raltitrexed (RTX) compositions and methods of making and using the compositions to treat diseases including hyperproliferative diseases such as cancer, disorders of the immune system such as rheumatoid arthritis, and infectious diseases such as HIV and malaria. 
     In some embodiments, the disclosure provides:
     [1] a composition comprising an alpha polyglutamated raltitrexed, wherein at least one glutamyl group has an alpha carboxyl group linkage;   [2] the composition of [1], wherein the alpha polyglutamated raltitrexed comprises 1-10 glutamyl groups having an alpha carboxyl group linkage;   [3] the composition of [1] or [2] wherein the alpha polyglutamated raltitrexed contains 4, 5, 2-10, 4-6, or greater than 5, glutamyl groups;   [4] the composition according to any of [1]-[3], which comprises alpha tetraglutamated raltitrexed;   [5] the composition according to any of [1]-[3], which comprises alpha pentaglutamated raltitrexed;   [6] the composition according to any of [1]-[3], which comprises alpha hexaglutamated raltitrexed;   [7] the composition according to any of [1] to [6], wherein
       (a) two or more glutamyl groups have an alpha carboxyl group linkage,   (b) each of the glutamyl groups other than the glutamyl group of raltitrexed has an alpha carboxyl group linkage; or   (c) two or more glutamyl groups have a gamma carboxyl group linkage,   
       [8] the composition according to any of [1]-[7], wherein at least one glutamyl group has both an alpha carboxyl group linkage and a gamma carboxyl group linkage;   [9] the composition according to any of [1]-[8], wherein:
       (a) at least 2 of the glutamyl groups of the alpha polyglutamated raltitrexed are in the L-form,   (b) each of the glutamyl groups of the alpha polyglutamated raltitrexed is in the L-form,   (c) at least 1 of the glutamyl groups of the alpha polyglutamated raltitrexed is in the D-form,   (d) each of the glutamyl groups of the alpha polyglutamated raltitrexed other than the glutamyl group of raltitrexed is in the D-form, or   (e) at least 2 of the glutamyl groups of the alpha polyglutamated raltitrexed are in the L-form and at least 1 of the glutamyl groups is in the D-form;   
       [10] the composition according to any of [1]-[9], wherein the polyglutamate is linear;   [11] the composition according to any of [1]-[9], wherein the polyglutamate is branched;   [12] a liposomal composition comprising the alpha polyglutamated raltitrexed according to any of [1]-[11] (Lp-αPRTX);   [13] the LαPP composition according to [12], wherein the alpha polyglutamated raltitrexed comprises glutamyl groups in the L-form having alpha carboxyl group linkages;   [14] the Lp-αPRTX composition according to [12] or [13], wherein each of the glutamyl groups of the alpha polyglutamated raltitrexed is in the L-form;   [15] the Lp-αPRTX composition of [12] or [13], wherein at least one of the glutamyl groups of the alpha polyglutamated raltitrexed is in the D-form;   [16] the Lp-αPRTX composition according to any of [12]-[15], wherein the liposome comprises an alpha polyglutamated raltitrexed containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups;   [17] the Lp-αPRTX composition according to any of [12]-[16], wherein at least one of the glutamyl groups of the alpha polyglutamated raltitrexed has a gamma carboxyl group linkage;   [18] the composition according to any of [12]-[17], wherein at least one glutamyl group has both an alpha carboxyl group linkage and a gamma carboxyl group linkage;   [19] the composition according to any of [12]-[18], which contains 2, 3, 4, 5, 2-10, 4-6, or more than 5, glutamyl groups that have both an alpha carboxyl group linkage and a gamma carboxyl group linkage;   [20] the Lp-αPRTX composition according to any of [12]-[19], wherein the liposome comprises an alpha polyglutamated raltitrexed containing alpha tetraglutamated raltitrexed, alpha pentaglutamated raltitrexed, or alpha hexaglutamated raltitrexed;   [21] the Lp-αPRTX composition according to any of [12]-[19], wherein the liposome comprises an alpha polyglutamated raltitrexed containing alpha tetraglutamated raltitrexed, alpha pentaglutamated raltitrexed, or alpha hexaglutamated raltitrexed;   [22] the Lp-αPRTX composition according to any of [12]-[21], wherein the polyglutamate is linear or branched;   [23] the Lp-αPRTX composition according to any of [12]-[22], wherein the liposome is pegylated (PαLp-αPRTX);   [24] the Lp-αPRTX composition according to any of [12]-[23], wherein the liposomes comprise at least 1% weight by weight (w/w) of the alpha polyglutamated raltitrexed or wherein during the process of preparing the Lp-αPRTX, at least 1% of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the αPRTX;   [25] the Lp-αPRTX composition according to any of [12]-[24], wherein the liposome has a diameter in the range of 20 nm to 500 nm or 20 nm to 200 nm;   [26] the Lp-αPRTX composition according to any of [12]-[25], wherein the liposome has a diameter in the range of 80 nm to 120 nm;   [27] the Lp-αPRTX composition according to any of [12]-[26], wherein the liposome is formed from liposomal components;   [28] the Lp-αPRTX composition according to [27], wherein the liposomal components comprise at least one of an anionic lipid and a neutral lipid;   [29] the Lp-αPRTX composition according to [27] or [28], wherein the liposomal components comprise at least one selected from the group consisting of: DSPE; DSPE-PEG; DSPE-PEG-maleimide; HSPC; HSPC-PEG; cholesterol; cholesterol-PEG; and cholesterol-maleimide;   [30] the Lp-αPRTX composition according to any of [27]-[29], wherein the liposomal components comprise at least one selected from the group consisting of: DSPE; DSPE-PEG; DSPE-PEG-FITC; DSPE-PEG-maleimide; cholesterol; and HSPC;   [31] the Lp-αPRTX composition according to any of [27]-[30], wherein one or more liposomal components further comprises a steric stabilizer;   [32] the Lp-αPRTX composition according to [31], wherein the steric stabilizer is at least one selected from the group consisting of polyethylene glycol (PEG); poly-L-lysine (PLL); monosialoganglioside (GM1); poly(vinyl pyrrolidone) (PVP); poly(acrylamide) (PAA); poly(2-methyl-2-oxazoline); poly(2-ethyl-2-oxazoline); phosphatidyl polyglycerol; poly[N-(2-hydroxypropyl) methacrylamide]; amphiphilic poly-N-vinylpyrrolidones; L-amino-acid-based polymer; oligoglycerol, copolymer containing polyethylene glycol and polypropylene oxide, Poloxamer 188, and polyvinyl alcohol;   [33] the Lp-αPRTX composition according to [32], wherein the steric stabilizer is PEG and the PEG has a number average molecular weight (Mn) of 200 to 5000 daltons;   [34] the Lp-αPRTX composition according to any of [12]-[33], wherein the liposome is anionic or neutral;   [35] the Lp-αPRTX composition according to any of [12]-[33], wherein the liposome has a zeta potential that is less than or equal to zero;   [36] the Lp-αPRTX composition according to any of [12]-[33], wherein the liposome has a zeta potential that is between 0 to −150 mV;   [37] the Lp-αPRTX composition according to any of [12]-[33], wherein the liposome has a zeta potential that is between −30 to −50 mV;   [38] the Lp-αPRTX composition according to any of [12]-[33], wherein the liposome is cationic;   [39] the Lp-αPRTX composition according to any of [12]-[38], wherein the liposome has an interior space comprising the alpha polyglutamated raltitrexed and an aqueous pharmaceutically acceptable carrier;   [40] the Lp-αPRTX composition of [39], wherein the pharmaceutically acceptable carrier comprises a tonicity agent such as dextrose, mannitol, glycerine, potassium chloride, sodium chloride, at a concentration of greater than 1%;   [41] the Lp-αPRTX composition of [39], wherein the aqueous pharmaceutically acceptable carrier is trehalose;   [42] the Lp-αPRTX composition of [41], wherein the pharmaceutically acceptable carrier comprises 5% to 20% weight of trehalose;   [43] the Lp-αPRTX composition according to any of [39]-[42], wherein the pharmaceutically acceptable carrier comprises 1% to 15 weight of dextrose;   [44] the Lp-αPRTX composition according to any of [39]-[43], wherein the interior space of the liposome comprises 5% dextrose suspended in an HEPES buffered solution;   [45] the Lp-αPRTX composition according to any of [39]-[44], wherein the pharmaceutically acceptable carrier comprises a buffer such as HEPES Buffered Saline (HBS) or similar, at a concentration of between 1 to 200 mM and a pH of between 2 to 8; [46] the Lp-αPRTX composition according to any of [39]-[45], wherein the pharmaceutically acceptable carrier comprises a total concentration of sodium acetate and calcium acetate of between 50 mM to 500 mM;   [47] the Lp-αPRTX composition according to any of [12]-[46], wherein the interior space of the liposome has a pH of 5-8 or a pH of 6-7, or any range therein between;   [48] the Lp-αPRTX composition according to any of [12]-[47], wherein the liposome comprises less than 500,000 or less than 200,000 molecules of the alpha polyglutamated raltitrexed;   [49] the Lp-αPRTX composition according to any of [12]-[48], wherein the liposome comprises between 10 to 100,000 molecules of the alpha polyglutamated raltitrexed, or any range therein between;   [50] the Lp-αPRTX composition according to any of [12]-[49], which further comprises a targeting moiety and wherein the targeting moiety has a specific affinity for a surface antigen on a target cell of interest;   [51] the Lp-αPRTX composition according to [50], wherein the targeting moiety is attached to one or both of a PEG and the exterior of the liposome, optionally wherein targeting moiety is attached to one or both of the PEG and the exterior of the liposome by a covalent bond;   [52] the Lp-αPRTX composition of [50] or [51], wherein the targeting moiety is a polypeptide;   [53] the Lp-αPRTX composition according to any of [50]-[52], wherein the targeting moiety is an antibody or an antigen binding fragment of an antibody;   [54] the Lp-αPRTX composition according to any of [50]-[53], wherein the targeting moiety binds the surface antigen with an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  as determined using BIACORE® analysis;   [55] the Lp-αPRTX composition according to any of [50]-[55], wherein the targeting moiety specifically binds one or more folate receptors selected from the group consisting of: folate receptor alpha (FR-α), folate receptor beta (FR-β), and folate receptor delta (FR-δ);   [56] the Lp-αPRTX composition according to any of [50]-[56], wherein the targeting moiety comprises one or more selected from the group consisting of: an antibody, a humanized antibody, an antigen binding fragment of an antibody, a single chain antibody, a single-domain antibody, a bi-specific antibody, a synthetic antibody, a pegylated antibody, and a multimeric antibody;   [57] the Lp-αPRTX composition according to any of [50]-[56], wherein each pegylated liposome comprises from 1 to 1000 or 30-200 targeting moieties;   [58] the Lp-αPRTX composition according to any of [39]-[57], further comprising one or more of an immunostimulatory agent, a detectable marker and a maleimide, wherein the immunostimulatory agent, the detectable marker or the maleimide is attached to said PEG or the exterior of the liposome;   [59] the Lp-αPRTX composition of [58], wherein the immunostimulating agent is at least one selected from the group consisting of: a protein immunostimulating agent; a nucleic acid immunostimulating agent; a chemical immunostimulating agent; a hapten; and an adjuvant;   [60] the Lp-αPRTX composition of [58] or [59], wherein the immunostimulating agent is at least one selected from the group consisting of: a fluorescein; a fluorescein isothiocyanate (FITC); a DNP; a beta glucan; a beta-1,3-glucan; a beta-1,6-glucan; a resolvin (e.g., a Resolvin D such as D n-6DPA  or D n-3DPA , a Resolvin E, or a T series resolvin); and a Toll-like receptor (TLR) modulating agent such as, an oxidized low-density lipoprotein (e.g., OXPAC, PGPC), and an eritoran lipid (e.g., E556);   [61] the Lp-αPRTX composition according to any of [58]-[60], wherein the immunostimulatory agent and the detectable marker is the same;   [62] the Lp-αPRTX composition according to any of [58]-[61], further comprising a hapten;   [63] the Lp-αPRTX composition of [62], wherein the hapten comprises one or more of fluorescein or Beta 1, 6-glucan;   [64] the Lp-αPRTX composition according to any of [12]-[63], which further comprises at least one cryoprotectant selected from the group consisting of mannitol; trehalose; sorbitol; and sucrose;   [65] a targeted composition comprising the composition according to any of [1]-[64];   [66] An non-targeted composition comprising the composition according to any of [1]-[49];   [67] the Lp-αPRTX composition according to any of [12]-[66], which further comprises carboplatin and/or pembroluzumab   [68] a pharmaceutical composition comprising the liposomal alpha polyglutamated raltitrexed composition according to any of [12]-[67];   [69] a pharmaceutical composition comprising alpha polyglutamated raltitrexed composition according to any of [1]-[7];   [70] the composition of any of [1]-[69], for use in the treatment of disease;   [71] Use of the composition of any of [1]-[70], in the manufacture of a medicament for the treatment of disease;   [72] a method for treating or preventing disease in a subject needing such treatment or prevention, the method comprising administering the composition of any of [1]-[70] to the subject;   [73] a method for treating or preventing disease in a subject needing such treatment or prevention, the method comprising administering the liposomal alpha polyglutamated raltitrexed composition of any of [12]-[69] to the subject;   [74] a method of killing a hyperproliferative cell that comprises contacting a hyperproliferative cell with the composition of any of [1]-[69];   [75] a method of killing a hyperproliferative cell that comprises contacting a hyperproliferative cell with the liposomal alpha polyglutamated raltitrexed composition of any of [12]-[69];   [76] the method of [74] or [75], wherein the hyperproliferative cell is a cancer cell, a mammalian cell, and/or a human cell;   [77] a method for treating cancer that comprises administering an effective amount of the composition of any of [1]-[69] to a subject having or at risk of having cancer;   [78] a method for treating cancer that comprises administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [12]-[68] to a subject having or at risk of having cancer;   [79] the method of [77] or [78], wherein the cancer is selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dyscrasias;   [80] the method of [77] or [78], wherein the cancer is a member selected from the group consisting of: lung cancer, breast cancer, colon cancer, pancreatic cancer, gastric cancer, bladder cancer, head and neck cancer, ovarian cancer, and cervical cancer;   [81] the method of [77] or [78], wherein the cancer is a member selected from the group consisting of: colorectal cancer, lung cancer, breast cancer, head and neck cancer, and pancreatic cancer;   [82] the method of [77] or [78], wherein the cancer selected from the group consisting of: colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma;   [83] a method for treating cancer that comprises administering an effective amount of the Lp-αPRTX composition of any of [50]-[66] to a subject having or at risk of having a cancer cell that expresses on its surface a folate receptor bound by the targeting moiety;   [84] a maintenance therapy for subjects that are undergoing or have undergone cancer therapy that comprise administering an effective amount of the composition of any of [1]-[69] to a subject that is undergoing or has undergone cancer therapy;   [85] a maintenance therapy for subjects that are undergoing or have undergone cancer therapy that comprise administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [12]-[69] to a subject that is undergoing or has undergone cancer therapy;   [86] a method for treating a disorder of the immune system that comprises administering an effective amount of the composition of any of [1]-[69] to a subject having or at risk of having a disorder of the immune system;   [87] a method for treating a disorder of the immune system that comprises administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [8]-[69] to a subject having or at risk of having a disorder of the immune system;   [88] a method for treating an infectious disease that comprises administering an effective amount of the composition of any of [1]-[69] to a subject having or at risk of having an infectious disease;   [89] a method for treating an infectious disease that comprises administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [12]-[69] to a subject having or at risk of having an infectious disease;   [90] a method of delivering alpha polyglutamated raltitrexed to a tumor expressing a folate receptor on its surface, the method comprising: administering the Lp-αPRTX composition of any of [1]-[69] to a subject having the tumor in an amount to deliver a therapeutically effective dose of the alpha polyglutamated raltitrexed to the tumor;   [91] a method of preparing an alpha polyglutamated raltitrexed composition comprising the liposomal alpha polyglutamated raltitrexed composition of any of [12]-[69], the method comprising: forming a mixture comprising: liposomal components and alpha polyglutamated antifolate in solution; homogenizing the mixture to form liposomes in the solution; and processing the mixture to form liposomes containing alpha polyglutamated raltitrexed;   [92] a method of preparing the composition of any of [12]-[69] comprising the steps of: forming a mixture comprising: liposomal components and alpha polyglutamated raltitrexed in a solution; homogenizing the mixture to form liposomes in the solution; processing the mixture to form liposomes entrapping and/or encapsulating alpha polyglutamated raltitrexed; and providing a targeting moiety on a surface of the liposomes, the targeting moiety having specific affinity for at least one of folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-δ);   [93] the method according to [92], wherein the processing step includes one or more steps of: thin film hydration, extrusion, in-line mixing, ethanol injection technique, freezing-and-thawing technique, reverse-phase evaporation, dynamic high pressure microfluidization, microfluidic mixing, double emulsion, freeze-dried double emulsion, 3D printing, membrane contactor method, and stirring; and/or   [94] the method according to [92], wherein said processing step includes one or more steps of modifying the size of the liposomes by one or more of steps of extrusion, high-pressure microfluidization, and/or sonication.   

     In some embodiments, the disclosure provides an alpha polyglutamated raltitrexed (αPRTX) composition wherein at least one of the glutamyl residues of the alpha polyglutamated raltitrexed is linked by its alpha carboxyl group. In some embodiments, the αPRTX contains 2-20, 2-15, 2-10, 2-5, or more than 5, glutamyl groups (including the glutamyl group in raltitrexed). In some embodiments, the αPRTX comprises two or more glutamyl groups in the L-form. In other embodiments, the αPRTX comprises a glutamyl group in the D-form. In further embodiments, the αPRTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the αPRTX comprises two or more glutamyl groups that have a gamma linkage. In some embodiments, at least one glutamyl group has both an alpha linkage and a gamma linkage. 
     In one embodiment, the αPRTX composition contains a chain of 3 glutamyl groups attached to the glutamyl group of raltitrexed (i.e., a tetraglutamated raltitrexed). In some embodiments, the tetraglutamated RTX comprises two or more glutamyl groups in the L-form. In other embodiments, the tetraglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, the tetraglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the tetraglutamated RTX comprises two or more glutamyl groups that have a gamma linkage. 
     In one embodiment, the αPRTX composition contains a chain of 4 glutamyl groups attached to the glutamyl group of raltitrexed (i.e., a pentaglutamated raltitrexed). In some embodiments, the pentaglutamated RTX comprises two or more glutamyl groups in the L-form. In other embodiments, the pentaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, the pentaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the pentaglutamated RTX comprises two or more glutamyl groups that have a gamma linkage. 
     In one embodiment, the αPRTX composition contains a chain of 5 glutamyl groups attached to the glutamyl group of raltitrexed (i.e., a hexaglutamated raltitrexed). In some embodiments, the hexaglutamated RTX comprises two or more glutamyl groups in the L-form. In other embodiments, the hexaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, the hexaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the hexaglutamated RTX comprises two or more glutamyl groups that have a gamma linkage. 
     In additional embodiments, the disclosure provides compositions containing delivery vehicles such as liposomes filled with (i.e., encapsulating) and/or otherwise associated with alpha polyglutamated raltitrexed, and methods of making and using the αPRTX filled/associated delivery vehicle compositions to deliver alpha polyglutamated raltitrexed to diseased (e.g., cancerous) and/or targeted cells. These compositions have uses that include but are not limited to treating diseases that include for example, hyperproliferative diseases such as cancer, disorders of the immune system such as rheumatoid arthritis, and infectious diseases such as HIV and malaria. The αPRTX filled/associated delivery vehicle compositions provide improvements to the efficacy and safety of delivering raltitrexed to cancer cells by providing the preferential delivery of a more cytotoxic payload (e.g., polyglutamated raltitrexed) compared to the cytotoxicity of raltitrexed administered in its monoglutamate state (RTX). 
     In additional embodiments, the disclosure provides a composition comprising a liposome encapsulating (filled with) alpha polyglutamated raltitrexed (Lp-αPRTX). In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX contains 2-20, 2-15, 2-10, 2-5, or more than 20, glutamyl groups (including the glutamyl group in raltitrexed). In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups in the L-form. In other embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form. In further embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups that have a gamma linkage. In additional embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises one or more glutamyl groups that have both an alpha linkage and a gamma linkage. In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises 2-10 glutamyl groups that have both an alpha linkage and a gamma linkage, or any range therein between. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is linear. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is branched. 
     In one embodiment, the Lp-αPRTX composition comprises an alpha polyglutamated RTX that contains a chain of 3 glutamyl groups attached to the glutamyl group of raltitrexed (i.e., tetraglutamated raltitrexed). In some embodiments, the tetraglutamated RTX comprises two or more glutamyl groups in the L-form. In other embodiments, the tetraglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, the tetraglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the tetraglutamated RTX comprises two or more glutamyl groups that have a gamma linkage. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is linear. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is branched. 
     In one embodiment, the Lp-αPRTX composition comprises an alpha polyglutamated RTX that contains a chain of 4 glutamyl groups attached to the glutamyl group of raltitrexed (i.e., pentaglutamated raltitrexed). In some embodiments, the pentaglutamated RTX comprises two or more glutamyl groups in the L-form. In other embodiments, the pentaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, the pentaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the pentaglutamated RTX comprises two or more glutamyl groups that have a gamma linkage. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is linear. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is branched. 
     In one embodiment, the Lp-αPRTX composition comprises an alpha polyglutamated RTX that contains a chain of 5 glutamyl groups attached to the glutamyl group of raltitrexed (i.e., hexaglutamated raltitrexed). In some embodiments, the hexaglutamated RTX comprises two or more glutamyl groups in the L-form. In other embodiments, the hexaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, the hexaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the hexaglutamated RTX comprises two or more glutamyl groups that have a gamma linkage. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is linear. In some embodiments, the polyglutamate chain of the alpha polyglutamated raltitrexed is branched. 
     In some embodiments, the Lp-αPRTX composition is cationic. In some embodiments, the Lp-αPRTX liposome is cationic and has a diameter in the range of 20 nm to 500 nm, 20 nm to 200 nm, 30 nm to 175 nm, or 50 nm to 150 nm, or any range therein between. In further embodiments, the Lp-αPRTX liposome is cationic and the composition has a diameter in the range of 80 nm to 120 nm, or any range therein between. In some embodiments, the cationic Lp-αPRTX composition comprises at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha polyglutamated RTX. In some embodiments, during the process of preparing the Lp-αPRTX, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the cationic Lp-αPRTX. In additional embodiments, the alpha polyglutamated raltitrexed encapsulated by the liposome is in a HEPES buffered solution within the liposome. 
     In other embodiments, Lp-αPRTX composition is anionic or neutral. In some embodiments, the Lp-αPRTX composition is cationic. In some embodiments, the Lp-αPRTX liposome is anionic or neutral and has a diameter in the range of 20 nm to 500 nm, 20 nm to 200 nm, 30 nm to 175 nm, or 50 nm to 150 nm, or any range therein between. In further embodiments, the Lp-αPRTX liposome is anionic or neutral and the composition has a diameter in the range of 80 nm to 120 nm, or any range therein between. In some embodiments, the Lp-αPRTX liposome is anionic and has a diameter in the range of 20 nm to 500 nm, 20 nm to 200 nm, 30 nm to 175 nm, or 50 nm to 150 nm, or any range therein between. In further embodiments, the Lp-αPRTX liposome is anionic and the composition has a diameter in the range of 80 nm to 120 nm, or any range therein between. In some embodiments, the Lp-αPRTX liposome is neutral and has a diameter in the range of 20 nm to 500 nm, 20 nm to 200 nm, 30 nm to 175 nm, or 50 nm to 150 nm, or any range therein between. In further embodiments, the Lp-αPRTX liposome is neutral and the composition has a diameter in the range of 80 nm to 120 nm, or any range therein between. In some embodiments, the anionic or neutral Lp-αPRTX composition comprises at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha polyglutamated RTX. In some embodiments, during the process of preparing the Lp-αPRTX, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the anionic or neutral Lp-αPRTX. In some embodiments, the anionic or neutral Lp-αPRTX composition comprises at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha tetraglutamated RTX. In some embodiments, the anionic or neutral Lp-αPRTX composition comprises at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha pentaglutamated RTX. In some embodiments, the anionic or neutral Lp-αPRTX composition comprises at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha hexaglutamated RTX. In additional embodiments, the alpha polyglutamated raltitrexed encapsulated by the liposome is in a HEPES buffered solution within the liposome. 
     In additional embodiments, the liposomal alpha polyglutamated raltitrexed composition is pegylated (PLp-αPRTX). 
     In some embodiments, the liposomal alpha polyglutamated raltitrexed composition is non-targeted (NTLp-αPRTX). That is, the NTLp-αPRTX composition does not have specific affinity towards an epitope (e.g., an epitope on a surface antigen) expressed on the surface of a target cell of interest. In further embodiments, the non-targeted liposomal alpha polyglutamated raltitrexed composition is pegylated (NTPLp-αPRTX). 
     In other embodiments, the liposomal alpha polyglutamated raltitrexed composition is targeted (TLp-αPRTX). That is, the TLp-αPRTX composition contains a targeting moiety that has specific affinity for an epitope (surface antigen) on a target cell of interest. In some embodiments, the targeting moiety of the TLp-αPRTX or TPLp-αPRTX is not attached to the liposome through a covalent bond. In other embodiments, the targeting moiety of the TLp-αPRTX or TPLp-αPRTX is attached to one or both of a PEG and the exterior of the liposome. Targeted liposomal alpha polyglutamated raltitrexed compositions (TLp-αPRTX and TPLp-αPRTX) provide further improvements over the efficacy and safety profile of raltitrexed, by specifically delivering alpha polyglutamated (e.g., tetraglutamated, pentaglutamated and hexaglutamated) raltitrexed to target cells such as cancer cells. In further embodiments, the targeted liposomal alpha polyglutamated raltitrexed composition is pegylated (TPLp-αPRTX). Function of the targeting moiety of the TLp-αPRTX and/or TPLp-αPRTX compositions include but are not limited to, targeting the liposome to the target cell of interest in vivo or in vitro; interacting with the surface antigen for which the targeting moiety has specific affinity, and delivering the liposome payload (αPRTX) into the cell. 
     Suitable targeting moieties are known in the art and include, but are not limited to, antibodies, antigen-binding antibody fragments, scaffold proteins, polypeptides, and peptides. In some embodiments, the targeting moiety is a polypeptide. In further embodiments, the targeting moiety is a polypeptide that comprises at least 3, 5, 10, 15, 20, 30, 40, 50, or 100, amino acid residues. In some embodiments, the targeting moiety is an antibody or an antigen-binding antibody fragment. In further embodiments, the targeting moiety comprises one or more of an antibody, a humanized antibody, an antigen binding fragment of an antibody, a single chain antibody, a single-domain antibody, a bi-specific antibody, a synthetic antibody, a pegylated antibody, and a multimeric antibody. In some embodiments, the targeting moiety has specific affinity for an epitope that is preferentially expressed on a target cell such as a tumor cell, compared to normal or non-tumor cells. In some embodiments, the targeting moiety has specific affinity for an epitope on a tumor cell surface antigen that is present on a tumor cell but absent or inaccessible on a non-tumor cell. In some embodiments, the targeting moiety binds an epitope of interest with an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  as determined using BIACORE® analysis. 
     In particular embodiments, the targeting moiety comprises a polypeptide that specifically binds a folate receptor. In some embodiments, the targeting moiety is an antibody or an antigen-binding antibody fragment. In some embodiments, the folate receptor bound by the targeting moiety is one or more folate receptors selected from the group consisting of: folate receptor alpha (FR-α, FOLR1), folate receptor beta (FR-β, FOLR2), and folate receptor delta (FR-δ, FOLR4). In some embodiments, the folate receptor bound by the targeting moiety is folate receptor alpha (FR-α). In some embodiments, the folate receptor bound by the targeting moiety is folate receptor beta (FR-β). In some embodiments, the targeting moiety specifically binds FR-α and FR-β. 
     In additional embodiments, the liposome αPRTX composition comprises one or more of an immunostimulatory agent, a detectable marker, and a maleimide, disposed on at least one of the PEG and the exterior of the liposome. In some embodiments, the liposome αPRTX composition (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX) is cationic. In other embodiments, the liposome αPRTX composition (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX) is anionic or neutral. In additional embodiments, the liposome of the liposome αPRTX composition (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX) has a diameter in the range of 20 nm to 500 nm, or any range therein between. In further embodiments, the liposome of the liposome αPRTX composition has a diameter in the range of 80 nm to 120 nm, or any range therein between. In some embodiments, the liposome αPRTX composition is pegylated (e.g., PLp-αPRTX, NTPLp-αPRTX, or TPLp-αPRTX). In some embodiments, the liposome αPRTX composition is targeted (e.g., TLp-αPRTX or TPLp-αPRTX). In further embodiments, the liposome αPRTX composition is pegylated and targeted (e.g., TPLp-αPRTX). In some embodiments, the liposome αPRTX composition comprises alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome αPRTX composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposome αPRTX composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposome αPRTX composition comprises alpha hexaglutamated raltitrexed. 
     In some embodiments, the liposome compositions comprise of alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups and at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha polyglutamated RTX. In some embodiments, the Lp-αPRTX composition comprises alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups and 1%-98.5% w/w of the alpha polyglutamated RTX. In some embodiments, the liposomes comprise alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups and wherein during the process of preparing the Lp-αPRTX, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75% of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the Lp-αPRTX. 
     In some embodiments, the liposome compositions comprise of alpha tetraglutamated raltitrexed and at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha tetraglutamated RTX. In some embodiments, the Lp-αPRTX composition comprises alpha tetraglutamated raltitrexed and 1%-98.5% w/w of the alpha tetraglutamated RTX. In some embodiments, the liposomes comprise alpha tetraglutamated raltitrexed and wherein during the process of preparing the Lp-αPRTX, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75% of the starting material of alpha tetraglutamated RTX is encapsulated (entrapped) in the Lp-αPRTX. 
     In some embodiments, the liposome compositions comprise of alpha pentaglutamated raltitrexed and at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha pentaglutamated RTX. In some embodiments, the Lp-αPRTX composition comprises alpha pentaglutamated raltitrexed and 1%-98.5% w/w of the alpha pentaglutamated RTX. In some embodiments, the liposomes comprise alpha pentaglutamated raltitrexed and wherein during the process of preparing the Lp-αPRTX, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75% of the starting material of alpha pentaglutamated RTX is encapsulated (entrapped) in the Lp-αPRTX. In some embodiments, the liposome compositions comprise of alphahexaglutamated raltitrexed and at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha hexaglutamated RTX. In some embodiments, the Lp-αPRTX composition comprises alpha hexaglutamated raltitrexed and 1%-98.5% w/w of the alpha hexaglutamated RTX. In some embodiments, the liposomes comprise alpha hexaglutamated raltitrexed and wherein during the process of preparing the Lp-αPRTX, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75% of the starting material of alpha pentaglutamated RTX is encapsulated (entrapped) in the Lp-αPRTX. 
     Liposomal compositions comprising liposomes encapsulating αPRTX are also provided. In some embodiments, the liposomal composition comprises a pegylated αPRTX composition. In some embodiments, the liposomal composition comprises a αPRTX composition that is linked to or otherwise associated with a targeting moiety. In further embodiments, the liposomal composition comprises a αPRTX composition that is pegylated and linked to or otherwise associated with a targeting moiety. In some embodiments, the liposomal composition comprises αPRTX that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposomal composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposomal composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposomal composition comprises alpha hexaglutamated raltitrexed. 
     In some embodiments, the liposomal composition comprises a liposome αPRTX (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, and TPLp-αPRTX). In some embodiments, the liposome αPRTX is pegylated (e.g., NTPLp-αPRTX, and TPLp-αPRTX). In some embodiments, the liposome αPRTX comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a target cell of interest such as a cancer cell (e.g., TLp-αPRTX or TPLp-αPRTX)). In further embodiments, the liposomal composition comprises a liposome αPRTX that is pegylated and further comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a target cell of interest such as a cancer cell (e.g., TPLp-αPRTX). In some embodiments, the liposomal composition comprises a liposome αPRTX that is cationic. In other embodiments, the liposomal composition comprises a liposome αPRTX that is anionic or neutral. In additional embodiments, the liposomal composition comprises a liposome αPRTX that has a diameter in the range of 20 nm to 500 nm, 20 nm to 200 nm, or any range therein between. In further embodiments, the liposome αPRTX has a diameter in the range of 80 nm to 120 nm, or any range therein between. 
     Pharmaceutical compositions comprising alpha polyglutamated raltitrexed (αPRTX) including delivery vehicles such as liposome αPRTX are also provided. In some embodiments, the pharmaceutical composition comprises a pegylated αPRTX composition. In some embodiments, the pharmaceutical composition comprise a αPRTX composition that is linked to or otherwise associated with a targeting moiety. In further embodiments, the pharmaceutical composition comprise a αPRTX composition that is pegylated and linked to or otherwise associated with a targeting moiety. In some embodiments, the pharmaceutical composition comprises αPRTX that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the pharmaceutical composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the pharmaceutical composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the pharmaceutical composition comprises alpha hexaglutamated raltitrexed. 
     In some embodiments, the pharmaceutical compositions comprise a liposome αPRTX (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, and TPLp-αPRTX). In some embodiments, the liposome αPRTX composition is pegylated (e.g., NTPLp-αPRTX, and TPLp-αPRTX). In some embodiments, the liposome αPRTX comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a target cell of interest such as a cancer cell (e.g., TLp-αPRTX or TPLp-αPRTX)). In further embodiments, the pharmaceutical composition comprises a liposome αPRTX composition that is pegylated and further comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a target cell of interest such as a cancer cell (e.g., TPLp-αPRTX). In some embodiments, the pharmaceutical composition comprises a liposome αPRTX that is cationic. In other embodiments, the pharmaceutical composition comprises a liposome αPRTX that is anionic or neutral. In additional embodiments, the pharmaceutical composition comprises a liposome αPRTX that has a diameter in the range of 20 nm to 500 nm or 20 nm to 500 nm, or any range therein between. In further embodiments, the liposome αPRTX composition has a diameter in the range of 80 nm to 120 nm, or any range therein between. 
     In additional embodiments, the disclosure provides a method of killing a cell that comprises contacting the cell with a composition comprising an alpha polyglutamated raltitrexed (αPRTX) composition. In some embodiments, the contacted cell is a mammalian cell. In further embodiments, the contacted cell is a human cell. In some embodiments, the contacted cell is a hyperproliferative cell. In further embodiments, the hyperproliferative cell is a cancer cell. In further embodiments, the contacted cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In yet further embodiments, the cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma. In some embodiments, the method is performed in vivo. In other embodiments, the method is performed in vitro. In some embodiments, the αPRTX contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the αPRTX composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the αPRTX composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the αPRTX composition comprises alpha hexaglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method of killing a cell that comprises contacting the cell with a liposome containing alpha polyglutamated raltitrexed (i.e., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX). In some embodiments, the contacted cell is a mammalian cell. In further embodiments, the contacted cell is a human cell. In some embodiments, the contacted cell is a hyperproliferative cell. In further embodiments, the contacted hyperproliferative cell is a cancer cell. In further embodiments, the cancer cell is a primary cell or a cell from a cell line obtained/obtained/derived from a cancer selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In yet further embodiments, the cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma. In some embodiments, the method is performed in vivo. In other embodiments, the method is performed in vitro. In some embodiments, the liposome contains a αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome contains alpha tetraglutamated raltitrexed. In some embodiments, the liposome contains alpha pentaglutamated raltitrexed. In other embodiments, the liposome contains alpha hexaglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a delivery vehicle (e.g., an immunoconjugate or liposome) comprising alpha polyglutamated raltitrexed to a subject having or at risk of having cancer. In some embodiments, the delivery vehicle is an antibody-containing immunoconjugate (comprising e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the administered delivery vehicle comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a cancer cell. In additional embodiments, the delivery vehicle comprises a targeting moiety that specifically binds a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA1, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle comprises a targeting moiety that specifically binds a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the targeting moiety specifically binds a cell surface antigen(s) derived from or determined to be expressed on a specific subject&#39;s tumor such as a neoantigen. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha tetraglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In further embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the cancer is selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In yet further embodiments, the cancer cell is selected from colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma. 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposome comprising alpha polyglutamated raltitrexed (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX) to a subject having or at risk of having cancer. In some embodiments, the liposome is pegylated. In some embodiments, the liposome is not pegylated. In additional embodiments, the liposome comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a cancer cell. In additional embodiments, the liposome comprises a targeting moiety that specifically binds a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. This also includes the use of cancer stem cell targeting moieties such as those targeting CD34, CD133 and CD44, CD138, and CD15. In some embodiments, the liposome comprises a targeting moiety that specifically binds a cell surface antigen(s) derived from or determined to be expressed on a specific subject&#39;s tumor such as a neoantigen. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the liposome comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposome comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposome comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposome comprises L alpha polyglutamated raltitrexed. In some embodiments, liposome comprises D alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the cancer is selected from the group consisting of: lung (e.g., non-small lung cancer), pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, and a hematologic malignancy (e.g., a leukemia or lymphoma). 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering to a subject having or at risk of having cancer, an effective amount of a liposomal composition comprising a liposome that comprises alpha polyglutamated raltitrexed and a targeting moiety that has a specific affinity for an epitope of antigen on the surface of the cancer. In some embodiments, the liposome comprises a targeting moiety that specifically binds a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the administered liposome comprises a targeting moiety that specifically binds a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s tumor such as a neoantigen. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are not pegylated. In some embodiments, liposomes of the administered liposomal composition comprise a αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprise alpha hexaglutamated raltitrexed. In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: lung cancer (e.g., non-small cell), pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, leukemia, lymphoma, and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In yet further embodiments, the cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma. 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposomal composition to a subject having or at risk of having a cancer that expresses folate receptor on its cell surface, wherein the liposomal composition comprises liposomes that comprise (a) alpha polyglutamated raltitrexed (αPRTX) and (b) a targeting moiety that has specific binding affinity for a folate receptor. In some embodiments, the targeting moiety has specific binding affinity for folate receptor alpha (FR-α), folate receptor beta (FR-β), and/or folate receptor delta (FR-δ). In some embodiments, the targeting moiety has a specific binding affinity for folate receptor alpha (FR-α) and folate receptor beta (FR-β). In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are not pegylated. In some embodiments, liposomes of the administered liposomal composition comprises an αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In yet further embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma. 
     In additional embodiments, the disclosure provides a method for cancer maintenance therapy that comprises administering an effective amount of a liposomal composition comprising liposomes that contain alpha polyglutamated raltitrexed (Lp-αPRTX) to a subject that is undergoing or has undergone cancer therapy. In some embodiments, the administered liposomal composition is a PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., PLp-αPRTX, NTPLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises targeted liposomes (e.g., TLp-αPRTX or TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are pegylated and targeted (e.g., TPLp-αPRTX). In some embodiments, liposomes of the administered liposomal composition comprises alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprise alpha hexaglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method for treating a disorder of the immune system that comprises administering an effective amount of a liposomal composition comprising liposomes that contain alpha polyglutamated raltitrexed (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX) to a subject having or at risk of having a disorder of the immune system. In some embodiments, the liposomal composition is administered to treat an autoimmune disease. In a further embodiment, the liposomal composition is administered to treat rheumatoid arthritis. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., PLp-αPRTX, NTPLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises targeted liposomes (e.g., TLp-αPRTX or TPLp-αPRTX) that contain a targeting moiety having a specific affinity for a surface antigen on a target cell of interest (e.g., an immune cell). In further embodiments, the administered liposomal composition comprises liposomes that are pegylated and targeted (e.g., TPLp-αPRTX)). In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprise alpha hexaglutamated raltitrexed. 
     The disclosure also provides a method of delivering alpha polyglutamated raltitrexed to a tumor cancer cell that comprises: administering to a subject having the tumor, a composition comprising alpha polyglutamated raltitrexed (L-αPRTX) and a targeting moiety that has a specific binding affinity for an epitope on a surface antigen on the tumor cell or cancer cell. In some embodiments, the administered targeting moiety is associated with a delivery vehicle. In some embodiments, the delivery vehicle is an antibody or an antigen binding fragment of an antibody. In further embodiments, the delivery vehicle is a liposome. In further embodiments, the antibody, antigen-binding antibody fragment, or liposome is pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, the administered composition comprises alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the administered composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered composition comprises alpha hexaglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method of preparing a liposomal composition that comprises a liposomal alpha polyglutamated raltitrexed (αPRTX) composition, the method comprising: forming a mixture comprising: liposomal components and a polyglutamated raltitrexed in solution; homogenizing the mixture to form liposomes in the solution; and processing the mixture to form liposomes containing polyglutamated raltitrexed. In some embodiments, the alpha polyglutamated raltitrexed contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the polyglutamated raltitrexed composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the polyglutamated raltitrexed composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the polyglutamated raltitrexed composition comprises alpha hexaglutamated raltitrexed. 
     In one embodiment, the disclosure provides a kit comprising an alpha polyglutamated raltitrexed composition or and/or αPRTX delivery vehicles such as liposomes containing αPRTX and αPRTX immunoconjugates (e.g., ADCs) described herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS/FIGURES 
         FIGS. 1A-1L  show chemical formulas of raltitrexed ( FIG. 1A ), exemplary alpha raltitrexed alpha polyglutamates, raltitrexed diglutamate ( FIG. 1B ), raltitrexed triglutamate ( FIGS. 1C and 1D ), raltitrexed tetraglutamate ( FIGS. 1E and 1F ), raltitrexed pentaglutamates ( FIGS. 1G and 1H ), raltitrexed hexaglutamates ( FIGS. 1I and 1J ), raltitrexed heptaglutamate ( FIGS. 1K and 1L ), raltitrexed octaglutamates ( FIGS. 1M and 1N ), exemplary alpha raltitrexed polyglutamates ( FIG. 1O ), and exemplary raltitrexed analogs ( FIGS. 1P and 1Q ).  FIGS. 1R-1U  present depictions of exemplary branched raltitrexed polyglutamate structures, including a branched polyglutamate having a gamma glutamyl backbone and alpha glutamyl branches ( FIG. 1S ) and a branched polyglutamate having a alpha glutamyl backbone and gamma glutamyl branches ( FIG. 1T ). 
         FIG. 2  presents the relative potency of liposomal pemetrexed alpha-L hexaglutamate (liposomal aG6) and its mirror image, liposomal alpha-D hexaglutamate (liposomal aDG6) relative to pemetrexed following exposure of the cancer cell lines SW620 (CRC), HT-29 (colon cancer), H1806 (triple negative breast cancer), OAW28 (ovarian cancer), H292 (NSCLC, adenocarcinoma subtype), and H2342 (NSCLC, adenocarcinoma subtype), over 48 hours. 
         FIG. 3  presents an example dose response relationship of free pemetrexed L-gamma hexaglutamate (gG6), liposomal pemetrexed L-gamma hexaglutamate (liposomal gG6), pemetrexed, and folate receptor alpha targeting antibody (FR1Ab) liposomal pemetrexed L-gammahexaglutamate (liposomal gG6-FR1Ab) in the NCI H2342 non-small cell lung cancer (NSCLC), adenocarcinoma subtype depicted as the percentage of viable cells after 48 hours of treatment. Folate receptor alpha targeted liposomes containing alpha polyglutamated pemetrexed are expected to also be successful in targeting and reducing the viability of NCI H2342 non-small cell lung cancer cells. 
         FIG. 4  presents an example dose response relationship of free pemetrexed L-gamma hexaglutamate (gG6), liposomal pemetrexed L-gamma hexaglutamate (liposomal gG6), pemetrexed, and folate receptor alpha targeting antibody (FR1Ab) liposomal pemetrexed L-gamma hexaglutamate (liposomal gG6-FR1Ab) in the HT-29 (colon cancer) at 48 hours. Folate receptor alpha targeted liposomes containing alpha polyglutamated pemetrexed are expected to also be successful in targeting and reducing the viability of HT-29 (colon cancer) cells. 
         FIG. 5  presents the treatment effect on HCC1806 triple negative breast cancer cells following exposure of liposomal pemetrexed alpha-L hexaglutamate (Lps Hexa aG6), liposomal pemetrexed alpha-D hexaglutamate (Lps Hexa aDG6), and to pemetrexed over 48 hours. 
         FIG. 6  presents the treatment effect on OAW28 ovarian cancer cells following exposure of liposomal pemetrexed alpha-L hexaglutamate (Lps Hexa aG6), liposomal pemetrexed alpha-D hexaglutamate (Lps Hexa aDG6), and to pemetrexed over 48 hours. 
         FIG. 7  presents the treatment effect on H292 non-small cell lung cancer cells following exposure of liposomal pemetrexed alpha-L hexaglutamate (Lps Hexa aG6), liposomal pemetrexed alpha-D hexaglutamate (Lps Hexa aDG6), as compared to pemetrexed over 48 hours. 
         FIG. 8  presents the treatment effect on H292 non-small cell lung cancer cells following exposure of various dose levels ranging from 16 to 128 nM of liposomal pemetrexed alpha-L hexaglutamate (Liposomal aG6), liposomal pemetrexed alpha-D hexaglutamate (Liposomal aDG6), and pemetrexed over 48 hours. At each of the tested dose ranges, the liposomal pemetrexed aG6 formulation is superior to inhibiting H292 non-small cell lung cancer cells compared to pemetrexed. 
         FIG. 9  presents the treatment effect on HCC1806 triple negative breast cancer cells following exposure of various dose levels ranging from 16 to 128 nM of liposomal pemetrexed alpha-L hexaglutamate (Liposomal aG6), liposomal pemetrexed alpha-D hexaglutamate (Liposomal aDG6), and pemetrexed over 48 hours. At each of the tested doses, the liposomal pemetrexed aG6 formulation is superior to pemetrexed in inhibiting HCC1806 triple negative breast cancer cells. 
         FIG. 10  presents the treatment effect on OAW28 ovarian cancer cells of liposomal pemetrexed alpha-L hexaglutamate (Liposomal aG6), liposomal alpha-D hexaglutamate (Liposomal aDG6), and pemetrexed following exposure over 48 hours following exposure over a range of concentrations. At the dose of 128 nM, pemetrexed appears to more effective than the Liposomal pemetrexed aG6 liposomal formulation, whereas the liposomal formulation at the dose of 32 nM and 64 nM has a better treatment effect than pemetrexed; at 16 nM the Liposomal pemetrexed aG6 treatment effect is similar in to pemetrexed. 
         FIG. 11  shows the toxicity of liposomal pemetrexed alpha-L hexaglutamate (Liposomal aG6), liposomal pemetrexed alpha-D hexaglutamate (Liposomal aDG6), and pemetrexed on differentiating human neutrophils at 64 nM, 128 nM, and 264 nM. The figure demonstrates that liposomal pemetrexed aG6 is significantly less toxic to differentiating human neutrophils than pemetrexed. 
         FIG. 12  shows the effect of liposomal pemetrexed alpha-L hexaglutamate (liposomal aG6), liposomal alpha-D hexaglutamate (liposomal aDG6), and pemetrexed on neutrophils (differentiated from CD34+ cells) following exposure of various dose levels ranging from 16 to 128 nM of the corresponding agent over 48 hours. 
         FIG. 13  shows the effect of liposomal pemetrexed alpha-L hexaglutamate (liposomal aG6), liposomal pemetrexed alpha-D hexaglutamate (liposomal aDG6), and pemetrexed on AML12 liver cells following exposure over 48 hours at 16 nM, 32 nM, and 64 nM, and 128 nM of the corresponding agent. Strikingly, there does not appear to be any toxicity to the AML12 liver cells following treatment with a liposomal pemetrexed aG6 at any of the liposomal agents at the dose levels tested. In contrast, pemetrexed treatment results in a reduction in the AML12 liver cell counts of approximately 40% at all doses studied. 
         FIG. 14  shows the effect of liposomal pemetrexed alpha-L hexaglutamate (liposomal aG6), liposomal pemetrexed alpha-D hexaglutamate (liposomal aDG6), and pemetrexed on CCD841 colon epithelium cells following exposure over 48 hours at 16 nM, 32 nM, and 64 nM, and 128 nM, of the corresponding agent. At all of the concentrations tested, pemetrexed leads to approximately a ≥50% decrease in the number of CCD841 colon epithelium cells compared to approximately a 20% or less decrease in cell number after treatment with each of the liposome compositions tested. 
         FIG. 15  depicts the structure of polyglutamate antifolate, Cisplatin (CDDP) and two potential aG6-Cisplatin complexes. The pH dependent formation of the interstrand and/or instrastrand coordination between the carboxyl groups of the polyglutamated antifolate and cisplatin is likely to disassemble into individual molecules of aG6 and cisplatin upon encountering acidic pH of lysosomes (pH 4-5) and presence of chloride ions inside the cells. 
         FIG. 16  presents the effects of liposomal aG6 treatment of mice with 40 mg/kg and 80 mg/kg given once weekly for 4 weeks upon the hematologic parameters: white blood cell (WBC) counts, neutrophil counts and as platelet counts. No appreciable decrease in mean neutrophil, mean white blood cell or mean platelet counts was observed. 
         FIG. 17  presents the effects of liposomal aG6 treatment of mice with 40 mg/kg and 80 mg/kg given once weekly for 4 weeks upon hemoglobin and reticulocyte indices. There is a minimal decrease in mean hemoglobin concentrations at the higher dose level. In parallel there is a slight increase in mean reticulocytosis indices 
         FIG. 18  presents the effects of liposomal aG6 treatment of mice with 40 mg/kg and 80 mg/kg given once weekly for 4 weeks upon hepatic markers including serum aspartate transaminase (AST) and serum alanine transaminase (ALT) along with serum albumin. There was no appreciable increases in liver transaminases mean AST or mean ALT levels and there was no observed change in mean albumin levels. 
         FIG. 19  presents the relative tumor volume of immunodeficient female Nu/J mice (6-8 weeks old) inoculated with NCI-H292 (Non-Small Cell Lung Cancer) cells and administered control, pemetrexed, and Liposomal aG6 intravenously at 167 mg/kg once every three weeks. As can be seen from these preliminary data, liposomal aG6 provides reduced tumor control compared to pemetrexed. 
         FIGS. 20A-F  present the dose response relationship of liposomal pemetrexed alpha-L triglutamate (Liposomal aG3), liposomal pemetrexed alpha-L pentaglutamate (Liposomal aG5), liposomal pemetrexed alpha-L octaglutamate (Liposomal aG7), and a combination of liposomal pemetrexed alpha-L hexaglutamate (aG6) and alpha-L dodecaglutamate (aG12) (Liposomal aG6 and aG12), over 48 hours on H2342 (NSCLC, adenocarcinoma subtype)( FIG. 20A ), H292 (NSCLC, adenocarcinoma subtype)( FIG. 20B ), HT-29 (colon cancer)( FIG. 20C ), HCC1806 (triple negative breast cancer)( FIG. 20D ), MCF7 (ER+ breast cancer)( FIG. 20E ), and OAW28 (ovarian cancer)( FIG. 20F ). Cell viability was determined by CellTiter-Glo® (CTG) luminescent cell viability assay essentially as described in Example 1. As shown in all cell lines, the potency of each of the polyglutamated pemetrexed liposomal compositions well exceeded that of the liposomal vehicle and empty liposome controls. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosure generally relates to novel alpha polyglutamated raltitrexed compositions. The compositions provide advances over prior treatments of hyperproliferative diseases such as cancer. Methods of making, delivering and using the alpha polyglutamated raltitrexed compositions are also provided. The alpha polyglutamated compositions have uses that include but are not limited to treating or preventing hyperproliferative diseases such as cancer, disorders of the immune system such as rheumatoid arthritis, and infectious diseases such as HIV and malaria. 
     I. Definitions 
     Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure pertains. 
     It is understood that wherever embodiments, are described herein with the language “comprising” otherwise analogous embodiments, described in terms of “containing” “consisting of” and/or “consisting essentially of” are also provided. However, when used in the claims as transitional phrases, each should be interpreted separately and in the appropriate legal and factual context (e.g., in claims, the transitional phrase “comprising” is considered more of an open-ended phrase while “consisting of” is more exclusive and “consisting essentially of” achieves a middle ground). 
     As used herein, the singular form “a”, “an”, and “the”, includes plural references unless it is expressly stated or is unambiguously clear from the context that such is not intended. 
     The term “and/or” as used in a phrase such as “A and/or B” herein is intended to include both A and B; A or B; A (alone); and B (alone). Likewise, the term “and/or” as used in a phrase such as “A, B, and/or C” is intended to encompass each of the following embodiments: A, B, and C; A, B, or C; A or C; A or B; B or C; A and C; A and B; B and C; A (alone); B (alone); and C (alone). 
     Headings and subheadings are used for convenience and/or formal compliance only, do not limit the subject technology, and are not referred to in connection with the interpretation of the description of the subject technology. Features described under one heading or one subheading of the subject disclosure may be combined, in various embodiments, with features described under other headings or subheadings. Further it is not necessarily the case that all features under a single heading or a single subheading are used together in embodiments. 
     Unless indicated otherwise, the terms “raltitrexed” and “RTX” are used interchangeably to include a salt, acid and and/or free base form of raltitrexed (e.g., raltitrexed disodium). Compositions containing a RTX salt may further contain any of a variety of cations, such as Na + , Mg 2+ , K + , NH 4   + , and/or Ca 2+ . In particular embodiments, the salts are pharmaceutically acceptable salts. In additional particular embodiments, the RTX salt contains Na + . Raltitrexed contains one L-gamma glutamyl group, and is therefore considered to be monoglutamated for the purpose of this disclosure. 
     The terms “polyglutamate”, polyglutamated”, or variations thereof, refer to a composition comprising at least one chain of 2 or more linked glutamyl groups. Polyglutamate chains can be linear or branched. Linear polyglutamate chains can contain for example, glutamyl groups containing either an alpha carboxyl group or a gamma carboxyl group linkage. Branched polyglutamate chains can comprise for example, one or more glutamyl groups that contain both an alpha carboxyl group and a gamma carboxyl group linkage to other glutamyl groups, thereby providing a branch point of the polyglutamate. Exemplary branched polyglutamates are depicted in  FIGS. 1R-1U . Polyglutamate chains comprise an N-terminal glutamyl group and one or more C-terminal glutamyl groups. The N-terminal glutamyl group of a polyglutamate chain is not linked to another glutamyl group via its amine group, but is linked to one or more glutamyl group via its carboxylic acid group. In some embodiments, the N-terminal glutamyl group of a polyglutamated-raltitrexed is the glutamyl group of raltitrexed. The C-terminal glutamyl group or groups of a polyglutamate chain are linked to another glutamyl group via their amine group, but are not linked to another glutamyl group via their carboxylic acid group. 
     The terms “polyglutamated-raltitrexed”, “polyglutamated-RTX”, “RTX-PG”, “PRTX” and iterations thereof, are used interchangeably herein to refer to a raltitrexed composition that comprises at least one glutamyl group in addition to the glutamyl group of raltitrexed (i.e., RTX-PG n , wherein n≥1). Reference to the number of glutamyl groups in an αPRTX (RTX-PG) herein takes into account the glutamyl group of raltitrexed. For example, a RTX-PG composition containing 5 glutamyl residues in addition to the glutamyl group of RTX is referred to herein as hexaglutamated raltitrexed or raltitrexed hexaglutamate. 
     The terms “alpha glutamyl group”, “alpha glutamate”, and “alpha linkage” as they relate to the linkage of a glutamyl group, refers to a glutamyl group that contains an alpha carboxyl group linkage. In some embodiments, the alpha linkage is an amide bond between the alpha carboxyl group of one glutamyl group and a second glutamyl group. The alpha linkage can be between a glutamyl group and the glutamyl group of raltitrexed, or between the glutamyl group and a second glutamyl group that is not present in raltitrexed, such as a glutamyl group within a polyglutamate chain attached to raltitrexed. 
     The terms “gamma glutamyl group”, “gamma glutamate”, and “gamma linkage”, as they relate to the linkage of a glutamyl group, refers to a glutamyl group that contains a gamma carboxyl group linkage. As discussed herein, once Raltitrexed enters the cell, it is polyglutamated by the enzyme folylpoly-gamma-glutamate synthetase (FPGS), which adds L glutamyl groups serially to the gamma carboxyl group of the glutamate within raltitrexed. Consequently, alpha polyglutamated raltitrexed compositions are not formed within cells during raltitrexed therapy. In some embodiments, the gamma linkage is an amide bond between the gamma carboxyl group of one glutamyl group and a second glutamyl group. The gamma linkage can be between a glutamyl group and the glutamyl group of raltitrexed, or between the glutamyl group and a second glutamyl group that is not present in raltitrexed, such as a glutamyl group within a polyglutamate chain attached to raltitrexed. In some embodiments, the gamma linkage refers to the amide bond of the glutamyl group in raltitrexed. Reference to gamma linkages are inclusive of gamma linkage of the glutamyl group in raltitrexed unless it is expressly stated or is unambiguously clear from the context that such is not intended. 
     Unless indicated otherwise, the terms “alpha polyglutamated raltitrexed”, αPRTX”, “alpha-RTX-PG”, and iterations thereof, are used interchangeably herein to refer to a polyglutamated-raltitrexed composition that comprises at least one glutamyl group that contains an alpha linkage. For example, a pentaglutamated-RTX composition wherein the 2 nd  glutamyl group has an alpha linkage, but each of the other glutamyl groups has a gamma linkage, is considered to be an alpha-RTX-PG for the purposes of this disclosure. In some embodiments, each of the glutamyl groups of the RTX-PG other than the glutamyl group of RTX, have an alpha linkage (e.g., RTX-PG n , wherein n=5 and wherein each of G 1 , G 2 , G 3 , G 4 , and G 5 , have an alpha linkage). In some embodiments, each of the glutamyl groups of the RTX-PG other than the C-terminal glutamyl group or groups and the glutamyl group of RTX, have an alpha linkage (e.g., RTX-PG n , wherein n=5 and wherein each of G 1 , G 2 , G 3 , and G 4 , have an alpha linkage). In some embodiments, each of the glutamyl groups of the RTX-PG other than the C-terminal glutamyl group or groups, have an alpha linkage (e.g., RTX-PG n , wherein n=5 and wherein each of the glutamyl group of RTX and G 1 , G 2 , G 3 , and G 4 , have an alpha linkage) 
     As use herein, the term “isolated” refers to a composition which is in a form not found in nature. Isolated alpha polyglutamated compositions include those which have been purified to a degree that they are no longer in a form in which they are found in nature. In some embodiments, an alpha polyglutamated raltitrexed which is isolated is substantially pure. Isolated compositions will be free or substantially free of material with which they are naturally associated such as other cellular components such as proteins and nucleic acids with which they may potentially be found in nature, or the environment in which they are prepared (e.g., cell culture). The alpha polyglutamated compositions may be formulated with diluents or adjuvants and still for practical purposes be isolated—for example, the alpha polyglutamated compositions will normally be mixed with pharmaceutically acceptable carriers or diluents when used in diagnosis or therapy. In some embodiments, the isolated alpha polyglutamated compositions (e.g., alpha polyglutamates and delivery vehicles such as liposomes containing the alpha polyglutamate contain less than 1% or less than 0.1% undesired DNA or protein content. In some embodiments, the alpha polyglutamate compositions (e.g., alpha polyglutamate and delivery vehicles such as liposomes containing the alpha polyglutamate) are “isolated.” 
     The term “targeting moiety” is used herein to refer to a molecule that provides an enhanced affinity for a selected target, e.g., a cell, cell type, tissue, organ, region of the body, or a compartment, e.g., a cellular, tissue or organ compartment. The targeting moiety can comprise a wide variety of entities. Targeting moieties can include naturally occurring molecules, or recombinant or synthetic molecules. In some embodiments, the targeting moiety is an antibody, antigen-binding antibody fragment, bispecific antibody or other antibody-based molecule or compound. In some embodiments, the targeting moiety is an aptamer, avimer, a receptor-binding ligand, a nucleic acid, a biotin-avidin binding pair, a peptide, protein, carbohydrate, lipid, vitamin, toxin, a component of a microorganism, a hormone, a receptor ligand or any derivative thereof. Other targeting moieties are known in the art and are encompassed by the disclosure. 
     The terms “specific affinity” or “specifically binds” mean that a targeting moiety such as an antibody or antigen binding antibody fragment, reacts or associates more frequently, more rapidly, with greater duration, with greater affinity, or with some combination of the above to the epitope, protein, or target molecule than with alternative substances, including proteins unrelated to the target epitope. Because of the sequence identity between homologous proteins in different species, specific affinity can, in several embodiments, include a binding agent that recognizes a protein or target in more than one species. Likewise, because of homology within certain regions of polypeptide sequences of different proteins, the term “specific affinity” or “specifically binds” can include a binding agent that recognizes more than one protein or target. It is understood that, in certain embodiments, a targeting moiety that specifically binds a first target may or may not specifically bind a second target. As such, “specific affinity” does not necessarily require (although it can include) exclusive binding, e.g., binding to a single target. Thus, a targeting moiety may, in certain embodiments, specifically bind more than one target. In certain embodiments, multiple targets may be bound by the same targeting moiety. 
     The term “epitope” refers to that portion of an antigen capable of being recognized and specifically bound by a targeting moiety (i.e., binding moiety) such as an antibody. When the antigen is a polypeptide, epitopes can be formed both from contiguous amino acids and noncontiguous amino acids juxtaposed by tertiary folding of a protein. Epitopes formed from contiguous amino acids are typically retained upon protein denaturing, whereas epitopes formed by tertiary folding are typically lost upon protein denaturing. An epitope typically includes at least 3, and more usually, at least 5 or 8-10 amino acids in a unique spatial conformation. 
     Expressions like “binding affinity for a target”, “binding to a target” and analogous expressions known in the art refer to a property of a targeting moiety which may be directly measured through the determination of the affinity constants, e.g., the amount of targeting moiety that associates and dissociates at a given antigen concentration. Different methods can be used to characterize the molecular interaction, such as, but not limited to, competition analysis, equilibrium analysis and microcalorimetric analysis, and real-time interaction analysis based on surface plasmon resonance interaction (for example using a BIACORE® instrument). These methods are well-known to the skilled person and are described, for example, in Neri et al., Tibtech 14:465-470 (1996), and Jansson et al., J. Biol. Chem. 272:8189-8197 (1997). 
     The term “delivery vehicle” refers generally to any compositions that acts to assist, promote or facilitate entry of alpha polyglutamated raltitrexed into a cell. Such delivery vehicles are known in the art and include, but are not limited to, liposomes, lipospheres, polymers (e.g., polymer-conjugates), peptides, proteins such as antibodies (e.g., immunoconjugates, such as Antibody Drug Conjugates (ADCs)) and antigen binding antibody fragments and derivatives thereof), cellular components, cyclic oligosaccharides (e.g., cyclodextrins), micelles, microparticles (e.g., microspheres), nanoparticles (e.g., lipid nanoparticles, biodegradable nanoparticles, and core-shell nanoparticles), hydrogels, lipoprotein particles, viral sequences, viral material, or lipid or liposome formulations, and combinations thereof. The delivery vehicle can be linked directly or indirectly to a targeting moiety. In some examples, the targeting moiety is selected from among a macromolecule, a protein, a peptide, a monoclonal antibody or a fatty acid lipid. 
     A “subject” refers to a human or vertebrate mammal including but not limited to a dog, cat, horse, goat and primate, e.g., monkey. Thus, the invention can also be used to treat diseases or conditions in non-human subjects. For instance, cancer is one of the leading causes of death in companion animals (i.e., cats and dogs). In some embodiments, of the invention, the subject is a human. In this disclosure, the term “subject” and “patient” is used interchangeably and has the same meaning. It is preferred generally that a maximum dose be used, that is, the highest safe dose according to sound medical judgment. 
     As used herein an “effective amount” refers to a dosage of an agent sufficient to provide a medically desirable result. The effective amount will vary with the desired outcome, the particular condition being treated or prevented, the age and physical condition of the subject being treated, the severity of the condition, the duration of the treatment, the nature of the concurrent or combination therapy (if any), the specific route of administration and like factors within the knowledge and expertise of the health practitioner. An “effective amount” can be determined empirically and in a routine manner, in relation to the stated purpose. In the case of cancer, the effective amount of an agent may reduce the number of cancer cells; reduce the tumor size; inhibit (i.e., slow to some extent and preferably stop) cancer cell infiltration into peripheral organs; inhibit (i.e., slow to some extent and preferably stop) tumor metastasis; inhibit, to some extent, tumor growth; and/or relieve to some extent one or more of the symptoms associated with the disorder. To the extent the drug may prevent growth and/or kill existing cancer cells, it may be cytostatic and/or cytotoxic. For cancer therapy, efficacy in vivo can, for example, be measured by assessing the duration of survival, duration of progression free survival (PFS), the response rates (RR), duration of response, and/or quality of life. 
     The terms “hyperproliferative disorder”, “proliferative disease”, and “proliferative disorder”, are used interchangeably herein to pertain to an unwanted or uncontrolled cellular proliferation of excessive or abnormal cells which is undesired, such as, neoplastic or hyperplastic growth, whether in vitro or in vivo. In some embodiments, the proliferative disease is cancer or tumor disease (including benign or cancerous) and/or any metastases, wherever the cancer, tumor and/or the metastasis is located. In some embodiments, the proliferative disease is a benign or malignant tumor. In some embodiments, the proliferative disease is a non-cancerous disease. In some embodiments, the proliferative disease is a hyperproliferative condition such as hyperplasias, fibrosis (especially pulmonary, but also other types of fibrosis, such as renal fibrosis), angiogenesis, psoriasis, atherosclerosis and smooth muscle proliferation in the blood vessels, such as stenosis or restenosis following angioplasty. 
     “Cancer,” “tumor,” or “malignancy” are used as synonymous terms and refer to any of a number of diseases that are characterized by uncontrolled, abnormal proliferation of cells, the ability of affected cells to spread locally or through the bloodstream and lymphatic system to other parts of the body (metastasize) as well as any of a number of characteristic structural and/or molecular features. “Tumor,” as used herein refers to all neoplastic cell growth and proliferation, whether malignant or benign, and all pre-cancerous and cancerous cells and tissues. A “cancerous tumor,” or “malignant cell” is understood as a cell having specific structural properties, lacking differentiation and being capable of invasion and metastasis. A cancer that can be treated using an αPRTX composition provided herein includes without limitation, a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. Other types of cancer and tumors that may be treated using an αPRTX composition are described herein or otherwise known in the art. The terms “cancer,” “cancerous,” “cell proliferative disorder,” “proliferative disorder,” and “tumor” are not mutually exclusive as referred to herein. 
     Terms such as “treating,” or “treatment,” or “to treat” refer to both (a) therapeutic measures that cure, slow down, lessen symptoms of, and/or halt progression of a diagnosed pathologic condition or disorder and (b) prophylactic or preventative measures that prevent and/or slow the development of a targeted disease or condition. Thus, subjects in need of treatment include those already with the cancer, disorder or disease; those at risk of having the cancer or condition; and those in whom the infection or condition is to be prevented. Subjects are identified as “having or at risk of having” cancer, an infectious disease, a disorder of the immune system, a hyperproliferative disease, or another disease or disorder referred to herein using well-known medical and diagnostic techniques. In certain embodiments, a subject is successfully “treated” according to the methods provided herein if the subject shows, e.g., total, partial, or transient amelioration or elimination of a symptom associated with the disease or condition (e.g., cancer, rheumatoid arthritis). In specific embodiments, the terms treating,” or “treatment,” or “to treat” refer to the amelioration of at least one measurable physical parameter of a proliferative disorder, such as growth of a tumor, not necessarily discernible by the patient. In other embodiments, the terms treating,” or “treatment,” or “to treat” refer to the inhibition of the progression of a proliferative disorder, either physically by, e.g., stabilization of a discernible symptom, physiologically by, e.g., stabilization of a physical parameter, or both. In other embodiments, the terms treating,” or “treatment,” or “to treat” refer to the reduction or stabilization of tumor size, tumor cell proliferation or survival, or cancerous cell count. Treatment can be with an α-PRTX composition, alone or in combination with an additional therapeutic agent. 
     “Subject” and “patient,” and “animal” are used interchangeably and refer to mammals such as human patients and non-human primates, as well as experimental animals such as rabbits, rats, and mice, and other animals. Animals include all vertebrates, e.g., mammals and non-mammals, such as chickens, amphibians, and reptiles. “Mammal” as used herein refers to any member of the class Mammalia, including, without limitation, humans and nonhuman primates such as chimpanzees and other apes and monkey species; farm animals such as cattle, sheep, pigs, goats and horses; domestic mammals such as dogs and cats; laboratory animals including rodents such as mice, rats and guinea pigs, and other members of the class Mammalia known in the art. In a particular embodiment, the patient is a human. 
     “Treatment of a proliferative disorder” is used herein to include maintaining or decreasing tumor size, inducing tumor regression (either partial or complete), inhibiting tumor growth, and/or increasing the life span of a subject having the proliferative disorder. In one embodiment, the proliferative disorder is a solid tumor. Such tumors include, for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma. In one embodiment, the proliferative disorder is a hematologic malignancy. Such hematologic malignancies include for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In some embodiments, the cancer is selected from the group consisting of: colorectal cancer, lung cancer, breast cancer, head and neck cancer, and pancreatic cancer. 
     The term “autoimmune disease” as used herein is defined as a disorder that results from an autoimmune response. An autoimmune disease is the result of an inappropriate and excessive response to a self-antigen. Examples of autoimmune diseases include but are not limited to, Addison&#39;s disease, alopecia areata, ankylosing spondylitis, autoimmune hepatitis, autoimmune parotitis, Crohn&#39;s disease, diabetes (Type I), dystrophic epidermolysis bullosa, epididymitis, glomerulonephritis, Graves&#39; disease, Guillain-Barr syndrome, Hashimoto&#39;s disease, hemolytic anemia, systemic lupus erythematosus, multiple sclerosis, myasthenia gravis, pemphigus vulgaris, psoriasis, rheumatic fever, rheumatoid arthritis, sarcoidosis, scleroderma, Sjogren&#39;s syndrome, spondyloarthropathies, thyroiditis, vasculitis, vitiligo, myxedema, pernicious anemia, ulcerative colitis, among others. 
     The term “therapeutic agent” is used herein to refer to an agent or a derivative thereof that can interact with a hyperproliferative cell such as a cancer cell or an immune cell, thereby reducing the proliferative status of the cell and/or killing the cell. Examples of therapeutic agents include, but are not limited to, chemotherapeutic agents, cytotoxic agents, platinum-based agents (e.g., cisplatin, carboplatin, oxaliplatin), taxanes (e.g., Taxol), etoposide, alkylating agents (e.g., cyclophosphamide, ifosamide), metabolic antagonists (e.g., methotrexate (MTX), 5-fluorouracil gemcitabine, or derivatives thereof), antitumor antibiotics (e.g., mitomycin, doxorubicin), plant-derived antitumor agents (e.g., vincristine, vindesine, Taxol). Such agents may further include, but are not limited to, the anticancer agents trimetrexate, TEMOZOLOMIDE™, RALTRITREXED™, S-(4-Nitrobenzyl)-6-thioinosine (NBMPR), 6-benzyguanidine (6-BG), bis-chloronitrosourea (BCNU) and CAMPTOTHECIN™, or a therapeutic derivative of any thereof. Additional examples of therapeutic agents that may be suitable for use in accordance with the disclosed methods include, without limitation, anti-restenosis, pro- or anti-proliferative, anti-inflammatory, anti-neoplastic, antimitotic, anti-platelet, anticoagulant, antifibrin, antithrombin, cytostatic, antibiotic and other anti-infective agents, anti-enzymatic, anti-metabolic, angiogenic, cytoprotective, angiotensin converting enzyme (ACE) inhibiting, angiotensin II receptor antagonizing and/or cardioprotective agents. “Therapeutic agents” also refer to salts, acids, and free based forms of the above agents. 
     As used herein, the term “chemotherapeutic agent” when used in relation to cancer therapy, refers to any agent that results in the death of cancer cells or inhibits the growth or spread of cancer cells. Examples of such chemotherapeutic agents include alkylating agents, antibiotics, antimetabolitic agents, plant-derived agents, and hormones. In some embodiments, the chemotherapeutic agent is cisplatin. In some embodiments, the chemotherapeutic agent is carboplatin. In some embodiments, the chemotherapeutic agent is oxaliplatin. In other embodiments, the chemotherapeutic agent is gemcitabine. In other embodiments, the chemotherapeutic agent is doxorubicin. 
     The term “antimetabolite” is used herein to refer to a therapeutic agent that inhibits the utilization of a metabolite or a prodrug thereof. Examples of antimetabolites include methotrexate, raltitrexed, 5-fluorouracil, 5-fluorouracil prodrugs such as capecitabine, 5-fluorodeoxyuridine monophosphate, cytarabine, cytarabine prodrugs such as nelarabine, 5-azacytidine, gemcitabine, mercaptopurine, thioguanine, azathioprine, adenosine, pentostatin, erythrohydroxynonyladenine, and cladribine. Anti-metabolites useful for practicing the disclosed methods include nucleoside analogs, including a purine or pyrimidine analogs. In some embodiments, the alpha polyglutamated raltitrexed compositions are used in combination with an antimetabolite selection from the group consisting of fluoropyrimidine 5-fluorouracil, 5-fluoro-2′-deoxycytidine, cytarabine, gemcitabine, troxacitabine, decitabine, Azacytidine, pseudoisocytidine, Zebularine, Ancitabine, Fazarabine, 6-azacytidine, capecitabine, N 4 -octadecyl-cytarabine, elaidic acid cytarabine, fludarabine, cladribine, clofarabine, nelarabine, forodesine, and pentostatin, or a derivative thereof. In one example, the nucleoside analog is a substrate for a nucleoside deaminase that is adenosine deaminase or cytidine deaminase. In some examples, the nucleoside analog is selected from among fludarabine, cytarabine, gemcitabine, decitabine and azacytidine or derivatives thereof. In certain embodiments, the antimetabolite is 5-fluorouracil. 
     As used herein, a “taxane” is an anti-cancer agent that interferes with or disrupts microtubule stability, formation and/or function. Taxane agents include paclitaxel and docetaxel as well as derivatives thereof, wherein the derivatives function against microtubules by the same mode of action as the taxane from which they are derived. In certain embodiments, the taxane is paclitaxel or docetaxel, or a pharmaceutically acceptable salt, acid, or derivative of paclitaxel or docetaxel. In certain embodiments, the taxane is paclitaxel (TAXOL®), docetaxel (TAXOTERE®), albumin-bound paclitaxel (nab-paclitaxel; ABRAXANE®), DHA-paclitaxel, or PG-paclitaxel. 
     The term “pharmaceutically-acceptable carrier” and “pharmaceutically acceptable carrier” refers to an ingredient in a pharmaceutical formulation, other than an active ingredient, which is nontoxic to a subject. A pharmaceutically acceptable carrier includes, but is not limited to, a buffer, carrier, excipient, stabilizer, diluent, or preservative. Pharmaceutically-acceptable carriers can include for example, one or more compatible solid or liquid filler, diluents or encapsulating substances which are suitable for administration to a human or other subject. 
     This disclosure generally relates novel alpha polyglutamated raltitrexed (RTX) compositions and methods of making and using the compositions to treat diseases including hyperproliferative diseases such as cancer, disorders of the immune system such as rheumatoid arthritis, and infectious diseases such as HIV and malaria. 
     In some embodiments, the disclosure provides:
     [1] a composition comprising an alpha polyglutamated raltitrexed, wherein at least one glutamyl group has an alpha carboxyl group linkage;   [2] the composition of [1], wherein the alpha polyglutamated raltitrexed comprises 1-10 glutamyl groups having an alpha carboxyl group linkage;   [3] the composition according to any of [1]-[2], wherein the alpha polyglutamated raltitrexed contains 4, 5, 6, 2-10, 4-6, or greater than 5, glutamyl groups;   [4] the composition according to any of [1]-[3], which comprises alpha tetraglutamated raltitrexed;   [5] the composition according to any of [1]-[3], which comprises alpha pentaglutamated raltitrexed;   [6] the composition according to any of [1]-[3], which comprises alpha hexaglutamated raltitrexed;   [7] the composition according to any of [1]-[6], wherein
       (a) two or more glutamyl groups have an alpha carboxyl group linkage,   (b) each of the glutamyl groups other than the glutamyl group of raltitrexed has an alpha carboxyl group linkage; or   (c) two or more glutamyl groups have a gamma carboxyl group linkage,   
       [8] the composition according to any of claims  1  to  6 , wherein
       (a) each of the glutamyl groups other than the C-terminal glutamyl group or groups and the glutamyl group of raltitrexed has an alpha carboxyl group linkage; or   (b) each of the glutamyl groups other than the C-terminal glutamyl group or groups has an alpha carboxyl group linkage;   
       [9] the composition according to any of [1]-[8], wherein at least one glutamyl group has both an alpha carboxyl group linkage and a gamma carboxyl group linkage;   [10] the composition according to any of [1]-[9], wherein:
       (a) at least 2 of the glutamyl groups of the alpha polyglutamated raltitrexed are in the L-form,   (b) each of the glutamyl groups of the alpha polyglutamated raltitrexed is in the L-form,   (c) at least 1 of the glutamyl groups of the alpha polyglutamated raltitrexed is in the D-form,   (d) each of the glutamyl groups of the alpha polyglutamated raltitrexed other than the glutamyl group of raltitrexed is in the D-form, or   (e) at least 2 of the glutamyl groups of the alpha polyglutamated raltitrexed are in the L-form and at least 1 of the glutamyl groups is in the D-form;   
       [11] the composition according to any of [1]-[10], wherein the polyglutamate is linear;   [12] the composition according to any of [1]-[10], wherein the polyglutamate is branched;   [13] a liposomal composition comprising the alpha polyglutamated raltitrexed according to any of [1]-[12] (Lp-αPRTX);   [14] the LαPP composition according to [13], wherein the alpha polyglutamated raltitrexed comprises glutamyl groups in the L-form having alpha carboxyl group linkages;   [15] the Lp-αPRTX composition according to [13] or [14], wherein each of the glutamyl groups of the alpha polyglutamated raltitrexed is in the L-form;   [16] the Lp-αPRTX composition of [13] or [14], wherein at least one of the glutamyl groups of the alpha polyglutamated raltitrexed is in the D-form;   [17] the Lp-αPRTX composition according to any of [13]-[16], wherein the liposome comprises an alpha polyglutamated raltitrexed containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups;   [18] the Lp-αPRTX composition according to any of [13]-[17], wherein at least one of the glutamyl groups of the alpha polyglutamated raltitrexed has a gamma carboxyl group linkage;   [19] the composition according to any of [13]-[18], wherein at least one glutamyl group has both an alpha carboxyl group linkage and a gamma carboxyl group linkage;   [20] the composition according to any of [13]-[19], which contains 2, 3, 4, 5, 2-10, 4-6, or more than 5, glutamyl groups that have both an alpha carboxyl group linkage and a gamma carboxyl group linkage;   [21] the Lp-αPRTX composition according to any of [13]-[20], wherein the liposome comprises an alpha polyglutamated raltitrexed containing alpha tetraglutamated raltitrexed, alpha pentaglutamated raltitrexed, or alpha hexaglutamated raltitrexed;   [22] the Lp-αPRTX composition according to any of [13]-[21], wherein the polyglutamate is linear or branched;   [23] the Lp-αPRTX composition according to any of [13]-[22], wherein the liposome is pegylated (PαLp-αPRTX);   [24] the Lp-αPRTX composition according to any of [13]-[23], wherein the liposomes comprise at least 1% weight by weight (w/w) of the alpha polyglutamated raltitrexed or wherein during the process of preparing the Lp-αPRTX, at least 1% of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the αPRTX;   [25] the Lp-αPRTX composition according to any of [13]-[24], wherein the liposome has a diameter in the range of 20 nm to 500 nm or 20 nm to 200 nm;   [26] the Lp-αPRTX composition according to any of [13]-[25], wherein the liposome has a diameter in the range of 80 nm to 120 nm;   [27] the Lp-αPRTX composition according to any of [13]-[26], wherein the liposome is formed from liposomal components;   [28] the Lp-αPRTX composition according to [27], wherein the liposomal components comprise at least one of an anionic lipid and a neutral lipid;   [29] the Lp-αPRTX composition according to [27] or [28], wherein the liposomal components comprise at least one selected from the group consisting of: DSPE; DSPE-PEG; DSPE-PEG-maleimide; HSPC; HSPC-PEG; cholesterol; cholesterol-PEG; and cholesterol-maleimide;   [30] the Lp-αPRTX composition according to any of [27]-[29], wherein the liposomal components comprise at least one selected from the group consisting of: DSPE; DSPE-PEG; DSPE-PEG-FITC; DSPE-PEG-maleimide; cholesterol; and HSPC;   [31] the Lp-αPRTX composition according to any of [27]-[30], wherein one or more liposomal components further comprises a steric stabilizer;   [32] the Lp-αPRTX composition according to [31], wherein the steric stabilizer is at least one selected from the group consisting of polyethylene glycol (PEG); poly-L-lysine (PLL); monosialoganglioside (GM1); poly(vinyl pyrrolidone) (PVP); poly(acrylamide) (PAA); poly(2-methyl-2-oxazoline); poly(2-ethyl-2-oxazoline); phosphatidyl polyglycerol; poly[N-(2-hydroxypropyl) methacrylamide]; amphiphilic poly-N-vinylpyrrolidones; L-amino-acid-based polymer; oligoglycerol, copolymer containing polyethylene glycol and polypropylene oxide, Poloxamer 188, and polyvinyl alcohol;   [33] the Lp-αPRTX composition according to [32], wherein the steric stabilizer is PEG and the PEG has a number average molecular weight (Mn) of 200 to 5000 daltons;   [34] the Lp-αPRTX composition according to any of [13]-[33], wherein the liposome is anionic or neutral;   [35] the Lp-αPRTX composition according to any of [13]-[33], wherein the liposome has a zeta potential that is less than or equal to zero;   [36] the Lp-αPRTX composition according to any of [13]-[33], wherein the liposome has a zeta potential that is between 0 to −150 mV;   [37] the Lp-αPRTX composition according to any of [13]-[33], wherein the liposome has a zeta potential that is between −30 to −50 mV;   [38] the Lp-αPRTX composition according to any of [13]-[33], wherein the liposome is cationic;   [39] the Lp-αPRTX composition according to any of [13]-[38], wherein the liposome has an interior space comprising the alpha polyglutamated raltitrexed and an aqueous pharmaceutically acceptable carrier;   [40] the Lp-αPRTX composition of [39], wherein the pharmaceutically acceptable carrier comprises a tonicity agent such as dextrose, mannitol, glycerine, potassium chloride, sodium chloride, at a concentration of greater than 1%;   [41] the Lp-αPRTX composition of [39], wherein the aqueous pharmaceutically acceptable carrier is trehalose;   [42] the Lp-αPRTX composition of [41], wherein the pharmaceutically acceptable carrier comprises 5% to 20% weight of trehalose;   [43] the Lp-αPRTX composition according to any of [39]-[42], wherein the pharmaceutically acceptable carrier comprises 1% to 15 weight of dextrose;   [44] the Lp-αPRTX composition according to any of [39]-[43], wherein the interior space of the liposome comprises 5% dextrose suspended in an HEPES buffered solution;   [45] the Lp-αPRTX composition according to any of [39]-[44], wherein the pharmaceutically acceptable carrier comprises a buffer such as HEPES Buffered Saline (HBS) or similar, at a concentration of between 1 to 200 mM and a pH of between 2 to 8;   [46] the Lp-αPRTX composition according to any of [39]-[45], wherein the pharmaceutically acceptable carrier comprises a total concentration of sodium acetate and calcium acetate of between 50 mM to 500 mM;   [47] the Lp-αPRTX composition according to any of [13]-[46], wherein the interior space of the liposome has a pH of 5-8 or a pH of 6-7, or any range therein between;   [48] the Lp-αPRTX composition according to any of [13]-[47], wherein the liposome comprises less than 500,000 or less than 200,000 molecules of the alpha polyglutamated raltitrexed;   [49] the Lp-αPRTX composition according to any of [13]-[48], wherein the liposome comprises between 10 to 100,000 molecules of the alpha polyglutamated raltitrexed, or any range therein between;   [50] the Lp-αPRTX composition according to any of [13]-[49], which further comprises a targeting moiety and wherein the targeting moiety has a specific affinity for a surface antigen on a target cell of interest;   [51] the Lp-αPRTX composition according to [50], wherein the targeting moiety is attached to one or both of a PEG and the exterior of the liposome, optionally wherein targeting moiety is attached to one or both of the PEG and the exterior of the liposome by a covalent bond;   [52] the Lp-αPRTX composition of [50] or [51], wherein the targeting moiety is a polypeptide;   [53] the Lp-αPRTX composition according to any of [50]-[52], wherein the targeting moiety is an antibody or an antigen binding fragment of an antibody;   [54] the Lp-αPRTX composition according to any of [50]-[53], wherein the targeting moiety binds the surface antigen with an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  as determined using BIACORE® analysis;   [55] the Lp-αPRTX composition according to any of [50]-[55], wherein the targeting moiety specifically binds one or more folate receptors selected from the group consisting of: folate receptor alpha (FR-α), folate receptor beta (FR-β), and folate receptor delta (FR-δ);   [56] the Lp-αPRTX composition according to any of [50]-[56], wherein the targeting moiety comprises one or more selected from the group consisting of: an antibody, a humanized antibody, an antigen binding fragment of an antibody, a single chain antibody, a single-domain antibody, a bi-specific antibody, a synthetic antibody, a pegylated antibody, and a multimeric antibody;   [57] the Lp-αPRTX composition according to any of [50]-[56], wherein each pegylated liposome comprises from 1 to 1000 or 30-200 targeting moieties;   [58] the Lp-αPRTX composition according to any of [39]-[57], further comprising one or more of an immunostimulatory agent, a detectable marker and a maleimide, wherein the immunostimulatory agent, the detectable marker or the maleimide is attached to said PEG or the exterior of the liposome;   [59] the Lp-αPRTX composition of [58], wherein immunostimulating agent is at least one selected from the group consisting of: a protein immunostimulating agent; a nucleic acid immunostimulating agent; a chemical immunostimulating agent; a hapten; and an adjuvant;   [60] the Lp-αPRTX composition of [58] or [59], wherein the immunostimulating agent is at least one selected from the group consisting of: a fluorescein; a fluorescein isothiocyanate (FITC); a DNP; a beta glucan; a beta-1,3-glucan; a beta-1,6-glucan; a resolvin (e.g., a Resolvin D such as D n-6DPA  or D n-3DPA , a Resolvin E, or a T series resolvin); and a Toll-like receptor (TLR) modulating agent such as, an oxidized low-density lipoprotein (e.g., OXPAC, PGPC), and an eritoran lipid (e.g., E556);   [61] the Lp-αPRTX composition according to any of [58]-[60], wherein the immunostimulatory agent and the detectable marker is the same;   [62] the Lp-αPRTX composition according to any of [58]-[61], further comprising a hapten;   [63] the Lp-αPRTX composition of [62], wherein the hapten comprises one or more of fluorescein or Beta 1, 6-glucan;   [64] the Lp-αPRTX composition according to any of [13]-[63], which further comprises in the interior space, the exterior space, or both the interior space at least one cryoprotectant selected from the group consisting of mannitol; trehalose; sorbitol; and sucroseat least one cryoprotectant selected from the group consisting of mannitol; trehalose; sorbitol; and sucrose;   [65] a targeted composition comprising the composition according to any of [1]-[64];   [66] An non-targeted composition comprising the composition according to any of [1]-[49];   [67] the Lp-αPRTX composition according to any of [13]-[66], which further comprises carboplatin and/or pembroluzumab;   [68] a pharmaceutical composition comprising the liposomal alpha polyglutamated raltitrexed composition according to any of [13]-[67];   [69] a pharmaceutical composition comprising alpha polyglutamated raltitrexed composition according to any of [1]-[8];   [70] the composition of any of [1]-[69], for use in the treatment of disease;   [71] use of the composition of any of [1]-[70], in the manufacture of a medicament for the treatment of disease;   [72] a method for treating or preventing disease in a subject needing such treatment or prevention, the method comprising administering the composition of any of [1]-[70] to the subject;   [73] a method for treating or preventing disease in a subject needing such treatment or prevention, the method comprising administering the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[69] to the subject;   [74] a method of killing a hyperproliferative cell that comprises contacting a hyperproliferative cell with the composition of any of [1]-[69];   [75] a method of killing a hyperproliferative cell that comprises contacting a hyperproliferative cell with the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[69];   [76] the method of [74] or [75], wherein the hyperproliferative cell is a cancer cell, a mammalian cell, and/or a human cell;   [77] a method for treating cancer that comprises administering an effective amount of the composition of any of [1]-[69] to a subject having or at risk of having cancer;   [78] a method for treating cancer that comprises administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[68] to a subject having or at risk of having cancer;   [79] the method of [77] or [78], wherein the cancer is selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dyscrasias;   [80] the method of [77] or [78], wherein the cancer is a member selected from the group consisting of: lung cancer, breast cancer, colon cancer, pancreatic cancer, gastric cancer, bladder cancer, head and neck cancer, ovarian cancer, and cervical cancer;   [81] the method of [77] or [78], wherein the cancer is wherein the cancer is mesothelioma or non-small cell lung carcinoma (NSCLC);   [82] the method of [77] or [78], wherein the cancer selected from the group consisting of colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma;   [83] a method for treating cancer that comprises administering an effective amount of the Lp-αPRTX composition of any of [50]-[66] to a subject having or at risk of having a cancer cell that expresses on its surface a folate receptor bound by the targeting moiety;   [84] a maintenance therapy for subjects that are undergoing or have undergone cancer therapy that comprise administering an effective amount of the composition of any of [1]-[69] to a subject that is undergoing or has undergone cancer therapy;   [85] a maintenance therapy comprising administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[69] to a subject that is undergoing or has undergone cancer therapy;   [86] a method for treating a disorder of the immune system that comprises administering an effective amount of the composition of any of [1]-[69] to a subject having or at risk of having a disorder of the immune system;   [87] a method for treating a disorder of the immune system that comprises administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [8]-[69] to a subject having or at risk of having a disorder of the immune system;   [88] a method for treating an infectious disease that comprises administering an effective amount of the composition of any of [1]-[69] to a subject having or at risk of having an infectious disease;   [89] a method for treating an infectious disease that comprises administering an effective amount of the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[69] to a subject having or at risk of having an infectious disease;   [90] a method of delivering alpha polyglutamated raltitrexed to a tumor expressing a folate receptor on its surface, the method comprising: administering the Lp-αPRTX composition of any of [1]-[69] to a subject having the tumor in an amount to deliver a therapeutically effective dose of the alpha polyglutamated raltitrexed to the tumor;   [91] a method of preparing an alpha polyglutamated raltitrexed composition comprising the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[69], the method comprising: forming a mixture comprising: liposomal components and alpha polyglutamated antifolate in solution; homogenizing the mixture to form liposomes in the solution; and processing the mixture to form liposomes containing alpha polyglutamated raltitrexed;   [92] a method of preparing an alpha polyglutamated raltitrexed composition comprising the liposomal alpha polyglutamated raltitrexed composition of any of [13]-[69], the method comprising: forming a mixture comprising: liposomal components and alpha polyglutamated raltitrexed in solution; and processing the mixture to form liposomes containing alpha polyglutamated raltitrexed;   [93] the method of [92], wherein the processing the mixture comprises homogenizing the mixture to form liposomes in the solution;   [94] a method of preparing the composition of any of [50]-[69] comprising the steps of: forming a mixture comprising: liposomal components and alpha polyglutamated raltitrexed in a solution; homogenizing the mixture to form liposomes in the solution; processing the mixture to form liposomes entrapping and/or encapsulating alpha polyglutamated raltitrexed; and providing a targeting moiety on a surface of the liposomes, the targeting moiety having specific affinity for at least one of folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-δ);   [95] a method of preparing the composition of any of [50]-[69], comprising the steps of: forming a mixture comprising: liposomal components and alpha polyglutamated raltitrexed in a solution; processing the mixture to form liposomes entrapping and/or encapsulating alpha polyglutamated raltitrexed; and providing a targeting moiety on a surface of the liposomes, the targeting moiety having specific affinity for at least one of folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-δ);   [96] the method of [95], wherein the processing step comprises homogenizing the mixture to form liposomes in the solution;   [97] the method according to [92], wherein the processing step includes one or more steps of: thin film hydration, extrusion, in-line mixing, ethanol injection technique, freezing-and-thawing technique, reverse-phase evaporation, dynamic high pressure microfluidization, microfluidic mixing, double emulsion, freeze-dried double emulsion, 3D printing, membrane contactor method, and stirring; and/or   [98] the method according to any of [95] to [97], wherein said processing step includes one or more steps of modifying the size of the liposomes by one or more of steps of extrusion, high-pressure microfluidization, and/or sonication; and/or   [99] The method of any of [91] to [98], wherein at least 1% of the starting material of alpha polyglutamated raltitrexed is encapsulated or entrapped in the liposomes.   

     II. Alpha Polyglutamated Raltitrexed (αPRTX) 
     The disclosure generally relates alpha polyglutamated raltitrexed (αPRTX) compositions. The αPRTX compositions comprise at least one glutamyl group having an alpha linkage. These compositions are structurally distinct from the L-gamma polyglutamated forms of raltitrexed (LαPRTX) that are produced by the enzyme folylpoly-gamma-glutamate synthetase (FPGS) in cells during raltitrexed therapy. 
     In some embodiments, the αPRTX composition contains 2-20, 2-15, 2-10, 2-5, 2-6, or more than 5, glutamyl groups (including the glutamyl group in raltitrexed). In some embodiments, each of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed, have an alpha linkage. In some embodiments, each of the glutamyl groups in the αPRTX other than the C-terminal glutamyl group or groups and the glutamyl group of raltitrexed, have an alpha linkage. In some embodiments, each of the glutamyl groups in the αPRTX other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 2 or more of the glutamyl groups in the αPRTX have a gamma linkage. In some embodiments, at least one glutamyl group of the alpha polyglutamated raltitrexed has both an alpha carboxyl group linkage and a gamma carboxyl group linkage. In some embodiments, each of the glutamyl groups in the αPRTX is in the L-form. In some embodiments, each of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed, is in the D-form. In some embodiments, the αPRTX comprises two or more glutamyl groups in the L-form and one or more glutamyl groups in the D-form. In some embodiments, the polyglutamate chain of the αPRTX is linear (not branched). In some embodiments, the polyglutamate chain of the αPRTX is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is diglutamated. That is, the alpha polyglutamated raltitrexed contains 1 additional glutamyl group in addition to the glutamyl group of raltitrexed (αRTX-PG 1 ), and the additional glutamyl group is linked to the glutamyl group in raltitrexed through an alpha linkage. In some embodiments, each of the glutamyl groups of the alpha diglutamated raltitrexed is in the L-form. In other embodiments, the alpha diglutamated RTX comprises a glutamyl group in the D-form. 
     In some embodiments, the alpha polyglutamated raltitrexed is triglutamated. That is, the alpha polyglutamated raltitrexed contains 2 additional glutamyl groups in addition to the glutamyl group of raltitrexed (αRTX-PG 2 ). In some embodiments, each of the 2 additional glutamyl groups have an alpha linkage. In other embodiments, one of the 2 additional glutamyl groups have an alpha linkage and the other glutamyl group has a gamma linkage. In some embodiments, one of the 2 additional glutamyl groups has an alpha linkage. In some embodiments, one of the 2 additional glutamyl groups has a gamma linkage. In some embodiments, two of the three glutamyl groups have an alpha linkage. In other embodiments, one of the three glutamyl groups has an alpha linkage and another glutamyl group has a gamma linkage. In some embodiments, one glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, each of the glutamyl groups of the alpha triglutamated raltitrexed is in the L-form. In other embodiments, the alpha triglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha triglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the triglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is tetraglutamated and thus contains 3 additional glutamyl groups in addition to the glutamyl group in raltitrexed (αRTX-PG 3 ). In some embodiments, each of the 3 additional glutamyl groups have an alpha linkage. In other embodiments, 1 or 2 of the 3 additional glutamyl groups have an alpha linkage and the remaining 2 or 1 glutamyl groups, respectively, have a gamma linkage. In some embodiments, 2 of the 3 additional glutamyl groups have an alpha linkage. In other embodiments, one of the 3 additional glutamyl groups has an alpha linkage and another additional glutamyl group has a gamma linkage. In other embodiments, one of the 3 additional glutamyl groups has an alpha linkage and a gamma linkage. In other embodiments, three of the four glutamyl groups have an alpha linkage. In some embodiments, at least one glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, the alpha tetraglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha tetraglutamated raltitrexed is in the L-form. In other embodiments, the alpha tetraglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha tetraglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the tetraglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is pentaglutamated (αRTX-PG 4 ) and contains a chain of 4 additional glutamyl groups attached to the glutamyl group of raltitrexed. In some embodiments, each of the 4 additional glutamyl groups in the chain have an alpha linkage. In some embodiments, each of the 4 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In other embodiments, 1, 2, or 3, of the 4 additional glutamyl groups have an alpha linkage and the remaining 3, 2, or 1, glutamyl groups, respectively, are linked to a glutamyl group of the molecule through a gamma linkage. In other embodiments, 1 or 2 of the 4 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 5 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 5 glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, the alpha pentaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha pentaglutamated raltitrexed is in the L-form. In other embodiments, the alpha pentaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha pentaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the pentaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is hexaglutamated (αRTX-PG 5 ) and contains a chain of 5 additional glutamyl groups attached to the glutamyl group of raltitrexed. In some embodiments, each of the 5 additional glutamyl groups in the chain have an alpha linkage. In some embodiments, each of the 5 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 4 of the 5 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, or 4, of the 5 additional glutamyl groups are linked to a glutamyl group of the molecule through an alpha linkage and the remaining 4, 3, 2, or 1, glutamyl groups, respectively, are linked to a glutamyl group of the molecule through a gamma linkage. In other embodiments, 1, 2, 3, or 4 of the 5 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 6 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 6 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 5 of the 6 glutamyl groups have an alpha linkage. In some embodiments, the alpha hexaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha hexaglutamated raltitrexed is in the L-form. In other embodiments, the alpha hexaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha hexaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the hexaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is heptaglutamated (αRTX-PG 6 ) and thus contains a chain of 6 additional glutamyl groups attached to the glutamyl group of raltitrexed. In some embodiments, each of the 6 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 6 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 5 of the 6 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, or 5, of the 6 additional glutamyl groups have an alpha linkage and the remaining 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, or 5 of the 6 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 7 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 7 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 6 of the 7 glutamyl groups have an alpha linkage. In some embodiments, the alpha heptaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha heptaglutamated raltitrexed is in the L-form. In other embodiments, the alpha heptaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha heptaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the heptaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is octaglutamated (αRTX-PG) and thus contains a chain of 7 additional glutamyl groups attached to the glutamyl group of raltitrexed. In some embodiments, each of the 7 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 6 of the 7 additional glutamyl groups in the chain have an alpha linkage. In some embodiments, each of the 7 additional glutamyl groups have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, or 6, of the 7 additional glutamyl groups have an alpha linkage and the remaining 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, or 6 of the 7 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 8 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 8 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 7 of the 8 glutamyl groups have an alpha linkage. In some embodiments, the alpha octaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha octaglutamated raltitrexed is in the L-form. In other embodiments, the alpha octaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha octaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the octaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is nonaglutamated (αRTX-PG 8 ) and contains a chain of 8 additional glutamyl groups attached to the glutamyl group of raltitrexed. In some embodiments, each of the 8 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 7 of the 8 additional glutamyl groups in the chain have an alpha linkage. In some embodiments, each of the 8 additional glutamyl groups have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, or 7, of the 8 additional glutamyl groups have an alpha linkage and the remaining 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, or 7 of the 8 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 9 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 9 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 8 of the 9 glutamyl groups have an alpha linkage. In some embodiments, the alpha nonaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha nonaglutamated raltitrexed is in the L-form. In other embodiments, the alpha nonaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha nonaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the nonaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is decaglutamated (αRTX-PG 9 ) (i.e., contains a chain of 9 additional glutamyl groups attached to the glutamyl group of raltitrexed). In some embodiments, each of the 9 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 9 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 8 of the 9 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, or 8, of the 9 additional glutamyl groups have an alpha linkage and the remaining 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, or 8 of the 9 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 10 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 10 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 9 of the 10 glutamyl groups have an alpha linkage. In some embodiments, the alpha decaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha decaglutamated raltitrexed is in the L-form. In other embodiments, the alpha decaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha decaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the decaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is undecaglutamated (αRTX-PG 10 ). In some embodiments, each of the 10 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 10 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 9 of the 10 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, or 9, of the 10 additional glutamyl groups have an alpha linkage and the remaining 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, or 9 of the 10 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 11 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 11 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 10 of the 11 glutamyl groups have an alpha linkage. In some embodiments, the alpha undecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha undecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha undecaglutamated RTX comprises a D glutamyl group. In further embodiments, each of the glutamyl groups of the alpha undecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the undecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is dodecaglutamated (αRTX-PG 11 ). In some embodiments, each of the 11 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 11 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 10 of the 11 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, of the 11, additional glutamyl groups have an alpha linkage and the remaining 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 of the 11 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 12 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 12 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 11 of the 12 glutamyl groups have an alpha linkage. In some embodiments, the alpha dodecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha dodecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha dodecaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha dodecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the dodecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is triskaidecaglutamated (αRTX-PG 12 ). In some embodiments, each of the 12 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 12 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 11 of the 12 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, of the 12 additional glutamyl groups have an alpha linkage and the remaining 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11 of the 12 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 13 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 13 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 12 of the 13 glutamyl groups have an alpha linkage. In some embodiments, the alpha triskaidecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha triskaidecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha triskaidecaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha triskaidecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the triskaidecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is tetradecaglutamated (αRTX-PG 13 ). In some embodiments, each of the 13 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 13 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 12 of the 13 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12, of the 13 additional glutamyl groups have an alpha linkage and the remaining 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 of the 13 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 14 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 14 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 13 of the 14 glutamyl groups have an alpha linkage. In some embodiments, the alpha tetradecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha tetradecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha tetradecaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha tetradecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the tetradecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is pentadecaglutamated (αRTX-PG 14 ). In some embodiments, each of the 14 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 14 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 13 of the 14 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13, of the 14 additional glutamyl groups have an alpha linkage and the remaining 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13 of the 14 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 15 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 15 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 14 of the 15 glutamyl groups have an alpha linkage. In some embodiments, the alpha pentadecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha pentadecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha pentadecaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha pentadecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the pentadecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is hexadecaglutamated (αRTX-PG 15 ). In some embodiments, each of the 15 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 15 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 14 of the 15 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, of the 15 additional glutamyl groups have an alpha linkage and the remaining 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 of the 15 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 16 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 16 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 15 of the 16 glutamyl groups have an alpha linkage. In some embodiments, the alpha hexadecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha hexadecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha hexadecaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha hexadecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the hexadecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In other embodiments, the alpha polyglutamated raltitrexed is heptadecaglutamated (αRTX-PG 16 ). In some embodiments, each of the 16 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 16 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 15 of the 16 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, of the 16, additional glutamyl groups have an alpha linkage and the remaining 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 of the 16 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 17 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 17 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 16 of the 17 glutamyl groups have an alpha linkage. In some embodiments, the alpha heptadecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha heptadecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha heptadecaglutamated RTX comprises a D glutamyl group. In further embodiments, each of the glutamyl groups of the alpha heptadecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the heptadecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is octadecaglutamated (αRTX-PG 17 ). In some embodiments, each of the 17 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 17 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 16 of the 17 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16, of the 17 additional glutamyl groups have an alpha linkage and the remaining 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16 of the 17 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 18 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 18 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 17 of the 18 glutamyl groups have an alpha linkage. In some embodiments, the alpha octadecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha octadecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha octadecaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha octadecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the octadecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is enneadecaglutamated (αRTX-PG 18 ). In some embodiments, each of the 18 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 18 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 17 of the 18 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17, of the 18 additional glutamyl groups have an alpha linkage and the remaining 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, or 17 of the 18 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 19 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 19 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 18 of the 19 glutamyl groups have an alpha linkage. In some embodiments, the alpha enneadecaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha enneadecaglutamated raltitrexed is in the L-form. In other embodiments, the alpha enneadecaglutamated RTX comprises a D glutamyl group. In further embodiments, each of the glutamyl groups of the alpha enneadecaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the enneadecaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is icosiglutamated (αRTX-PG 19 ). In some embodiments, each of the 19 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 19 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 18 of the 19 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18, of the 19 additional glutamyl groups have an alpha linkage and the remaining 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18 of the 19 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 20 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 20 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 19 of the 20 glutamyl groups have an alpha linkage. In some embodiments, the alpha icosiglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha icosiglutamated raltitrexed is in the L-form. In other embodiments, the alpha icosiglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha icosiglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the icosiglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed is icosikaihenaglutamated (αRTX-PG 20 ). In some embodiments, each of the 20 additional glutamyl groups have an alpha linkage. In some embodiments, each of the 20 additional glutamyl groups in the chain other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 19 of the 20 additional glutamyl groups in the chain have an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19, of the 20 additional glutamyl groups have an alpha linkage and the remaining 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, glutamyl groups, respectively, have a gamma linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 of the 20 additional glutamyl groups have an alpha linkage and the remaining non-C-terminal glutamyl groups are linked to a glutamyl group of the molecule through a gamma linkage. In some embodiments, at least one additional glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, at least one of the 21 glutamyl groups has both an alpha linkage and a gamma linkage. In some embodiments, each of the 21 glutamyl groups other than the C-terminal glutamyl group or groups have an alpha linkage. In some embodiments, 20 of the 21 glutamyl groups have an alpha linkage. In some embodiments, the alpha icosikaihenaglutamated RTX comprises two or more glutamyl groups in the L-form. In further embodiments, each of the glutamyl groups of the alpha icosikaihenaglutamated raltitrexed is in the L-form. In other embodiments, the alpha icosikaihenaglutamated RTX comprises a glutamyl group in the D-form. In further embodiments, each of the glutamyl groups of the alpha icosikaihenaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In additional embodiments, the icosikaihenaglutamated RTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed contains a chain of 4-7 glutamyl groups attached to raltitrexed (i.e., αRTX-PGn, wherein n=4-7) and each of the 4-7 attached glutamyl groups have an alpha linkage. In some embodiments, the alpha polyglutamated raltitrexed contains a chain of 4-7 glutamyl groups attached to raltitrexed (i.e., αRTX-PGn, wherein n=4-7) and each of the 4-7 attached glutamyl groups other than the C-terminal glutamyl group or groups has an alpha linkage. In some embodiments, each of the 4-7 attached glutamyl groups is in the L-form. In other embodiments, each of the 4-7 attached glutamyl groups is in the D-form. In other embodiments, the 4-7 attached glutamyl groups are in the L-form and the D-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In one embodiment, the alpha polyglutamated raltitrexed is tetraglutamated and each of the 3 glutamyl groups in the polyglutamate chain attached to the raltitrexed contains an alpha linkage. In one embodiment, the alpha polyglutamated raltitrexed is tetraglutamated and each of the 3 glutamyl groups in the polyglutamate chain attached to the raltitrexed other than the C-terminal glutamyl group or groups contains an alpha linkage. In some embodiments, each of the 4 glutamyl groups is in the L-form. In some embodiments, each of the glutamyl groups in the alpha tetraglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In other embodiments, at least two glutamyl groups in the alpha tetraglutamate raltitrexed are in the L-form and at least one glutamyl group is in the D-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In one embodiment, the alpha polyglutamated raltitrexed is pentaglutamated and each of the 4 glutamyl groups in the polyglutamate chain attached to the raltitrexed contains an alpha linkage. In one embodiment, the alpha polyglutamated raltitrexed is pentaglutamated and each of the 4 glutamyl groups in the polyglutamate chain attached to the raltitrexed other than the C-terminal glutamyl group or groups contains an alpha linkage. In some embodiments, each of the 4 glutamyl groups is in the L-form. In some embodiments, each of the glutamyl groups in the alpha pentaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In other embodiments, at least two glutamyl groups in the alpha pentaglutamated raltitrexed are in the L-form and at least one glutamyl group is in the D-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In one embodiment, the alpha polyglutamated raltitrexed is hexaglutamated and each of the 5 glutamyl groups in the polyglutamate chain attached to the raltitrexed contains an alpha linkage. In one embodiment, the alpha polyglutamated raltitrexed is hexaglutamated and each of the 5 glutamyl groups in the polyglutamate chain attached to the raltitrexed other than the C-terminal glutamyl group or groups contains an alpha linkage. In some embodiments, each of the 5 glutamyl groups is in the L-form. In some embodiments, each of the glutamyl groups in the alpha hexaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In other embodiments, at least two glutamyl groups in the alpha hexaglutamated raltitrexed are in the L-form and at least one glutamyl group is in the D-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In another embodiment, the alpha polyglutamated raltitrexed is heptaglutamated and each of the 6 glutamyl groups in the polyglutamate chain attached to the raltitrexed contains an alpha linkage. In another embodiment, the alpha polyglutamated raltitrexed is heptaglutamated and each of the 6 glutamyl groups in the polyglutamate chain attached to the raltitrexed other than the C-terminal glutamyl group or groups contains an alpha linkage. In some embodiments, each of the 6 glutamyl groups is in the L-form. In some embodiments, each of the glutamyl groups in the alpha heptaglutamated raltitrexed other than the glutamyl group of raltitrexed, is in the D-form. In other embodiments, at least two glutamyl groups in the alpha heptaglutamated raltitrexed are in the L-form and at least one glutamyl group is in the D-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed (αPRTX) contains a total of 1-15, 1-10, 2-15, 2-10, 3-15, 3-10, 3-6, 3-5, 4-10, 4-7, or 4-6, glutamyl groups including the glutamyl group in raltitrexed, or any range therein between. In some embodiments, each of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed have an alpha linkage. In some embodiments, each of the glutamyl groups in the αPRTX other than the C-terminal glutamyl group or groups and the glutamyl group of raltitrexed has an alpha linkage. In some embodiments, each of the glutamyl groups in the αPRTX other than the C-terminal glutamyl group or groups has an alpha linkage. In some embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, of the glutamyl groups in the αPRTX have an alpha linkage. In some embodiments, the αPRTX comprises glutamyl groups in the L-form and the D-form. In further embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, of the glutamyl groups in the αPRTX have an alpha linkage and 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, or none, of the glutamyl groups, respectively, has a gamma linkage. In some embodiments, each of the glutamyl groups in the polyglutamate structure of the polyglutamated raltitrexed is in the L-form. In some embodiments, each of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed is in the D-form. In one embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, of the glutamyl groups in the αPRTX is in the L-form. In another embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, of the glutamyl groups in the αPRTX is in the D-form. In some embodiments, the polyglutamate chain is linear. In other embodiments, the polyglutamate chain is branched. 
     In some embodiments, the alpha polyglutamated raltitrexed (αPRTX) contains a total of 2-20, 2-15, 2-10, 2-5, glutamyl groups including the glutamyl group in raltitrexed, or any range therein between. In some embodiments, each of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed, have an alpha linkage. In some embodiments, each of the glutamyl groups in the αPRTX other than the C-terminal glutamyl group or groups and the glutamyl group of raltitrexed has an alpha linkage. In some embodiments, each of the glutamyl groups in the αPRTX other than the C-terminal glutamyl group or groups has an alpha linkage. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19, of the glutamyl groups have an alpha linkage. In some embodiments, the αPRTX contains two or more glutamyl groups having a gamma linkage. In further embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19, of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed have an alpha linkage and 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, or none, of the glutamyl groups, respectively, has a gamma linkage. In some embodiments, each of the glutamyl groups in the αPRTX is in the L-form. In some embodiments, each of the glutamyl groups in the αPRTX other than the glutamyl group of raltitrexed is in the D-form. In one embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20, of the glutamyl groups in the αPRTX are in the L-form. In another embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19, glutamyl groups in the αPRTX is in the D-form. 
     In some embodiments, the alpha polyglutamated raltitrexed contains a total of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, glutamyl groups in addition to the glutamyl group in raltitrexed). In further embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, of the additional glutamyl groups have an alpha linkage. In additional embodiments, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1, of the glutamyl groups in the alpha polyglutamated raltitrexed have a gamma linkage. In some embodiments, at least one glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, the glutamyl group in raltitrexed has an alpha linkage. In some embodiments, the glutamyl group in raltitrexed has both an alpha linkage and a gamma linkage. 
     In some embodiments, a total of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, glutamyl groups in the alpha polyglutamated raltitrexed are in the L-form, the D-form, or in the L-form and the D-form. In some embodiments, each of the glutamyl groups of the alpha polyglutamated raltitrexed is in the L-form. In other embodiments, each of the glutamyl groups of the alpha polyglutamated raltitrexed other than the glutamyl group of raltitrexed is in the D-form. In alternative embodiments, at least two of the glutamyl groups in the alpha polyglutamated raltitrexed are in the L-form and at least one of the glutamyl groups in the alpha polyglutamated raltitrexed is in the D-form. In some embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16, glutamyl groups in the alpha polyglutamated raltitrexed are in the L-form. In other embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, glutamyl groups in the alpha polyglutamated raltitrexed are in the D-form. 
     In additional embodiments, the alpha polyglutamated raltitrexed contains 20-100, 20-75, 20-50, 20-40, 20-30, 20-25, or more than 100, alpha glutamyl groups, or any range therein between. In some embodiments, each of the glutamyl groups of the alpha polyglutamated raltitrexed is in the L-form. In other embodiments, each of the glutamyl groups of the alpha polyglutamated raltitrexed other than the glutamyl group of raltitrexed is in the D-form. In alternative embodiments, at least two of the glutamyl groups in the alpha polyglutamated raltitrexed are in the L-form and at least one of the glutamyl groups in the alpha polyglutamated raltitrexed is in the D-form 
     In additional embodiments, the provided compositions comprise an alpha polyglutamated raltitrexed that contains 1, 2, 3, 4, 5, 6, 7, 8, 9, 1-10, or 1-20, glutamyl groups that have alpha linkages. In some embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, 1-10, or 1-20, glutamyl groups in the L-form. In some embodiments, the alpha polyglutamated raltitrexed contains 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1-10, or 1-20, glutamyl groups in the D-form. In some embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, 1-10, or 1-20, glutamyl groups in the L-form and 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10 or 1-20, glutamyl groups in the D-form. In other embodiments, the alpha polyglutamated raltitrexed contains at least 1 glutamyl group that has both an alpha linkage and a gamma linkage. In some embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, 1-10, or more than 10 glutamyl groups that have both an alpha linkage and a gamma linkage. 
     In some embodiments, the alpha-polyglutamated raltitrexed contains a least 1 glutamyl group having an alpha linkage and contains 2, 3, 4, 5, 6, 7, 8, 9, 1-10, 1-20, or more, glutamyl groups having a gamma linkage. For example, in some embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, L-alpha glutamyl group linkages and further contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, L-gamma glutamyl group linkages. In some further embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, L-alpha glutamyl group linkages and further contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, D-gamma glutamyl group linkages. In additional further embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, D-alpha glutamyl group linkages and further contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, D-gamma glutamyl group linkages. In other further embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, or 1-10, D-gamma glutamyl group linkages and further contains 1, 2, 3, 4, 5, 6, or 1-10, L-gamma glutamyl group linkages. In other embodiments, the alpha polyglutamated raltitrexed contains at least 1 glutamyl group that has both an alpha linkage and a gamma linkage. In some embodiments, the alpha polyglutamated raltitrexed contains 1, 2, 3, 4, 5, 6, 7, 8, 9, 1-10, or more than 10, glutamyl groups that have both an alpha linkage and a gamma linkage. 
     In some embodiments, the alpha polyglutamated raltitrexed composition provided herein is capable of accepting one or more additional glutamyl groups that, is the composition is able to act as a substrate for by FPGS (folylpolyglutamate synthetase). Reagents and assays and reagents for determining the ability of an alpha polyglutamated raltitrexed composition to act as a substrate for FPGS (e.g., human FPGS, or rat liver FPGS) are readily available and can routinely be performed. 
     In some embodiments, the rate of uptake of naked alpha PPMX compositions disclosed herein (e.g, alpha PRTX that is not associated with a delivery vehicle) are taken up by hepatic cells at a significantly reduced rated compared to the uptake rate of raltitrexed under the same physiological conditions. In some embodiments, the rate of hepatic cell uptake of the naked alpha PRTX composition is less than 30%, 20%, 15%, or 10% compared to the rate of raltitrexed. In further embodiments, the rate of the efflux (transport out) of alpha PRTX compositions disclosed herein from hepatic-cells occurs at a rate that is significantly reduced compared to raltitrexed (e.g., less than 30%, 20%, 15%, or 10%) compared to the rate of raltitrexed (RTX). 
     In some embodiments, an alpha polyglutamated raltitrexed composition provided herein is more cytotoxic to hyperproliferative cells than raltitrexed. In some embodiments the hyperproliferative cells are cancer cells. In some embodiments, the hyperproliferative cells a colorectal carcinoma cells, colon cancer cells, breast cancer cells, or ovarian cancer cells. In some embodiments, the cancer cells are mesothelioma cells or non-small cell lung carcinoma cells. In some embodiments, cytotoxicity is measured in an in vitro assay. In some embodiments, the alpha polyglutamated raltitrexed is a hexaglutamated raltitrexed. 
     In some embodiments, an alpha polyglutamated raltitrexed composition provided herein has lower toxic side effects than raltitrexed. In some embodiments, the alpha polyglutamated raltitrexed composition provided herein is less toxic to non-hyperproliferative cells than raltitrexed. In some embodiments, the alpha polyglutamated raltitrexed composition provided herein is less toxic to neutrophils, liver cells, or to colon epithelium cells than raltitrexed. In some embodiments, the neutrophils human neutrophils, differentiating human neutrophils, or neutrophils differentiated from CD34+ cells. In some embodiments, the liver cells are AML12 liver cells. In some embodiments, the colon epithelium cells are CCD841 colon epithelium cells. In some embodiments, the toxicity is measured in an in vitro assay. In some embodiments, the alpha polyglutamated raltitrexed is a hexaglutamated raltitrexed. 
     In some embodiments, an alpha polyglutamated raltitrexed composition provided herein has lower toxic side effects than to raltitrexed. In some embodiments, an alpha polyglutamated raltitrexed composition provided herein causes fewer or less severe toxic side effects in an vivo assay than raltitrexed. In some embodiments, the in vivo assay is an in vivo murine model. In some embodiments, an alpha polyglutamated raltitrexed composition provided herein causes fewer or less severe hematological or hepatic toxic side effects than raltitrexed. In some embodiments, hematological side effects are assessed by measuring mean neutrophil, mean white blood cell or mean platelet counts. In some embodiments, hepatic toxic side effects are assessed by measuring serum aspartate transaminase (AST), serum alanine transaminase (ALT), and/or serum albumin levels. In some embodiments, the in vivo assay comprises administering 40 mg/kg or 80 mg/kg of the alpha polyglutamated raltitrexed composition once weekly for 4 weeks. In some embodiments, the alpha polyglutamated raltitrexed is a hexaglutamated raltitrexed. 
     In some embodiments, treatment with an alpha polyglutamated raltitrexed composition provided herein does not induce significant hematological or hepatic toxic side effects in an in vivo murine model. In some embodiments, hematological side effects are assessed by measuring mean neutrophil, mean white blood cell or mean platelet counts. In some embodiments, hepatic toxic side effects are assessed by measuring serum aspartate transaminase (AST), serum alanine transaminase (ALT), and/or serum albumin levels. In some embodiments, an alpha polyglutamated raltitrexed composition provided herein does not significantly decrease mean neutrophil, mean white blood cell or mean platelet counts. In some embodiments, an alpha polyglutamated raltitrexed composition provided herein does not significantly increase serum aspartate transaminase (AST) and serum alanine transaminase (ALT) levels. In some embodiments, an alpha polyglutamated raltitrexed composition provided herein does not significantly decrease serum albumin levels. In some embodiments, the in vivo assay comprises administering 40 mg/kg or 80 mg/kg of the alpha polyglutamated raltitrexed composition once weekly for 4 weeks. In some embodiments, the alpha polyglutamated raltitrexed is a hexaglutamated raltitrexed. 
     In some embodiments, the alpha polyglutamated raltitrexed compositions do not contain a fluorine atom. In some embodiments, the alpha polyglutamated raltitrexed compositions do not contain a 4-fluoroglutamyl group 
     Alpha polyglutamated raltitrexed (α PRTX) compositions and their uses are further described in each of U.S. Appl. Nos. 62/374,458, and Intl. Appl. Nos. PCT/US2017/046666 and PCT/US2017/046667, the contents of each of which is herein incorporated by reference in its entirety. 
     A. Polyglutamated Raltitrexed Analogs and Derivatives 
     The disclosure also encompasses alpha polyglutamated raltitrexed derivatives and analogs. The compositions and methods disclosed herein are envisioned to apply to any and every known derivative or analog of raltitrexed that is polyglutamated. 
     In some embodiments the polyglutamated raltitrexed analog or derivative composition prepared and used according to the disclosed compositions and methods is depicted in  FIGS. 1I-1J . In some embodiments the analog corresponds to a modified form of raltitrexed wherein the glutamyl group of raltitrexed is not linked to the remainder of raltitrexed molecule through a gamma peptide linkage. In some embodiments, the analog is a variant form of raltitrexed wherein the glutamyl group of raltitrexed in in the D-form. In some embodiments, the polyglutamated form of raltitrexed, or polyglutamated raltitrexed analog or derivative is not fluorine. 
     In additional embodiments, the alpha polyglutamated raltitrexed derivative or analog has a variant polyglutamate chain. In some embodiments the polyglutamate chain contains one or more natural or synthetic residues other than glutamate. In some embodiments the polyglutamate chain contains one or more glutamyl groups that do not contain an amide linkage. In other embodiments, one or more of the glutamyl groups of the polyglutamate chain is derivatized. 
     B. RTX-PG Synthesis 
     The raltitrexed polyglutamate compositions provided herein may be obtained by following synthetic procedures using reagents and chemical intermediates known in the art. The addition of glutamyl residues to the glutamyl residues of raltitrexed can be accomplished using synthetic procedures known in the art. In some embodiments, glutamyl residues are added serially to the glutamyl residue of raltitrexed. In additional embodiments, polyglutamates are added to the glutamyl reside of raltitrexed using “click chemistry” methods or other bioconjugate chemistries known to those in the art. Alternatively a peptide of glutamyl residues can be generated of the desired length and added to a precursor of raltitrexed which does not have a glutamyl residue. The peptide can be produced using synthetic procedures known in the art. In some embodiments, an initial glutamyl residue is bonded to wang resin and additional glutamyl residues are added serially via solid phase peptide synthesis using F-moc chemistry. After the final glutamyl residue is added the raltitrexed precursor is coupled to the peptide and the molecule is cleaved from the resin. 
     C. Raltitrexed-PG Complexes 
     The inventors have surprisingly found that polyglutamated antifolates such as raltitrexed (αPRTX) are able to form complexes with other compositions including therapeutic agents, including cytotoxic compounds such as platinum-based compounds. Accordingly, in some embodiments, the disclosure provides a complex of a αPRTX (e.g., a αPRTX disclosed herein) and a therapeutic agent or a salt or acid thereof. 
     In some embodiments, the αPRTX/complex comprise αPRTX and a therapeutic agent. In some embodiments, the therapeutic agent is a cytotoxic compound such as a chemotherapeutic agent. In further embodiments, the αPRTX/complex contains a platinum-based drug such as platinum-based chemotherapeutic agent (e.g., cisplatin, carboplatin and oxaliplatin). In other embodiments, the αPRTX/complex contains a taxane-based chemotherapeutic agent (e.g., paclitaxel and docetaxel). In other embodiments, the αPRTX/complex contains a cyclodextrin. In further embodiments, the αPRTX/complex is encapsulated in a liposome 
     In some embodiments, the disclosure provides a composition comprising a complex of a αPRTX and a therapeutic agent or a salt or acid thereof. In further embodiments, the αPRTX/therapeutic agent complex comprises one or more αPRTX containing 2-150, 2-100, 2-75, 2-50, 2-24, 2-30, 2-20, 2-19, 2-15, 2-10, or 2-5, glutamyl groups. In some embodiments, the αPRTX/therapeutic agent complex comprises one or more αPRTX containing 3-10, 3-9, 3-8, or 3-7, glutamyl groups, or any range therein between. In other embodiments, the αPRTX/therapeutic agent complex comprises one or more αPRTX containing 4-10, 4-9, 4-8, 4-7, 4-6, or 4-5, glutamyl groups, or any range therein between. In one particular embodiment, the complex comprises one or more αPRTX containing 3-10 glutamyl groups. In further embodiments, the αPRTX/therapeutic agent complex comprises one or more αPRTX containing 3-7 glutamyl groups. In another embodiment, the αPRTX/therapeutic agent complex comprises one or more αPRTX containing 5 glutamyl groups. In another embodiment, the αPRTX/therapeutic agent complex comprises one or more αPRTX containing 6 glutamyl groups. In some embodiments, the therapeutic agent is a cytotoxic compound or a salt or acid thereof. In a further embodiment, the therapeutic agent is a chemotherapeutic agent or a salt or acid thereof. In another embodiment, the therapeutic agent is a platinum-based drug. In another embodiment, the therapeutic agent is a taxane-based drug. In additional embodiments, the molar ratio of αPRTX/therapeutic agent in the complex is in the range 1-10:1. In some embodiments, the molar ratio of αPRTX/therapeutic agent in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/therapeutic agent in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the αPRTX/therapeutic agent complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In an alternative embodiment, the αPRTX complex comprises αPRTX and cyclodextrin. In some embodiments, the molar ratio of αPRTX (e.g., αPRTX salt)/cyclodextrin in the complex is in the range 1-20:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/cyclodextrin in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/cyclodextrin in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/cyclodextrin in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In other embodiments, the molar ratio of αPRTX/cyclodextrin in the complex is in the range 1:1-20, 1:1-10, or 1:2-8, or any range therein between. In some embodiments, the molar ratio of αPRTX/cyclodextrin in the complex is: 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the αPRTX/cyclodextrin complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In some embodiments, the disclosure provides a composition comprising a αPRTX/platinum-based chemotherapeutic agent complex. In some embodiments, the platinum-based chemotherapeutic agent is selected from the group consisting of: cisplatin, carboplatin, and oxaliplatin, or a salt or acid thereof. In other embodiments, the αPRTX/platinum-based chemotherapeutic agent complex comprises an analog of a cisplatin, carboplatin, oxaliplatin, or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is in the range 1-20:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In other embodiments, the molar ratio of αPRTX/platinum-based chemotherapeutic agent in the complex is in the range 1:1-20, 1:1-10, or 1:2-8, or any range therein between. In some embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/platinum-based agent complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the αPRTX/platinum-based chemotherapeutic agent complex comprises an analog of a cisplatin, carboplatin, oxaliplatin, or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/platinum-based analog in the complex is in the range 1-20:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/platinum-based analog in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/platinum-based analog in the complex is 11:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/platinum-based analog complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In further embodiments, the disclosure provides a complex containing αPRTX and cisplatin or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/cisplatin (or cisplatin salt or acid) in the complex is in the range 1-20:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/cisplatin (or cisplatin salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/cisplatin (or cisplatin salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/cisplatin (or cisplatin salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/cisplatin (or cisplatin salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/cisplatin (or cisplatin salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In another embodiment, the disclosure provides a complex containing αPRTX and carboplatin or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/carboplatin (or carboplatin salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/carboplatin (or carboplatin salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/carboplatin (or carboplatin salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/carboplatin (or carboplatin salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/cyclodextrin in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/carboplatin (or carboplatin salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In another embodiment, the disclosure provides a complex containing αPRTX and oxaliplatin, or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/oxaliplatin (or oxaliplatin salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/oxaliplatin (or oxaliplatin salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/oxaliplatin (or oxaliplatin salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/oxaliplatin (or oxaliplatin salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/oxaliplatin (or oxaliplatin salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/oxaliplatin (or oxaliplatin salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising αPRTX and a platinum-based chemotherapeutic agent (platinum) selected from the group consisting of: nedaplatin, heptaplatin, lobaplatin, stratoplatin, paraplatin, platinol, cycloplatin, dexormaplatin, spiroplatin, picoplatin, triplatin, tetraplatin, iproplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM216, NK121, CI973, DWA 2114R, NDDP, and dedaplatin, or a salt or acid thereof. In other embodiments, the αPRTX/platinum-based chemotherapeutic agent complex comprises an analog of nedaplatin, heptaplatin, lobaplatin, stratoplatin, paraplatin, platinol, cycloplatin, dexormaplatin, spiroplatin, picoplatin, triplatin, tetraplatin, iproplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM216, NK121, CI973, DWA 2114R, NDDP, or dedaplatin, or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/platinum (or platinum salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/platinum (or platinum salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/platinum (or platinum salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/platinum (or platinum salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/platinum (or platinum salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/platinum (or salt or acid or analog thereof) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In some embodiments, the disclosure provides a composition comprising a αPRTX/taxane-based chemotherapeutic agent (taxane) complex. In some embodiments, the taxane-based chemotherapeutic agent is selected from the group consisting of: paclitaxel (PTX), docetaxel (DTX), larotaxel (LTX), and cabazitaxel (CTX), or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/taxane-based agent in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/taxane (or taxane salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/taxane (or taxane salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/taxane (or taxane salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/taxane (or taxane salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/taxane-based agent complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising αPRTX and paclitaxel (PTX), or a salt or acid thereof. In other embodiments, the αPRTX/taxane-based chemotherapeutic agent complex comprises an analog of paclitaxel (PTX), or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/paclitaxel (or paclitaxel salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/paclitaxel (or paclitaxel salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/paclitaxel (or paclitaxel salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/paclitaxel (or paclitaxel salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/paclitaxel (or paclitaxel salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/paclitaxel (or paclitaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising αPRTX and docetaxel (DTX), or a salt or acid thereof. In other embodiments, the αPRTX/taxane-based chemotherapeutic agent complex comprises an analog of docetaxel (DTX), or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/docetaxel (or docetaxel salt or acid) in the complex is in the range 1-20:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/docetaxel (or docetaxel salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/docetaxel (or docetaxel salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/docetaxel (or docetaxel salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/docetaxel (or docetaxel salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/docetaxel (or docetaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising αPRTX and larotaxel (LTX), or a salt or acid thereof. In other embodiments, the αPRTX/taxane-based chemotherapeutic agent complex comprises an analog of larotaxel (LTX), or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/larotaxel (or larotaxel salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/larotaxel (or larotaxel salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/larotaxel (or larotaxel salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/larotaxel (or larotaxel salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/larotaxel (or larotaxel salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/larotaxel (or larotaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising αPRTX and cabazitaxel (CTX), or a salt or acid thereof. In other embodiments, the αPRTX/taxane-based chemotherapeutic agent complex comprises an analog of cabazitaxel (CTX), or a salt or acid thereof. In some embodiments, the molar ratio of αPRTX/cabazitaxel (or cabazitaxel salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/cabazitaxel (or cabazitaxel salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/cabazitaxel (or cabazitaxel salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/cabazitaxel (or cabazitaxel salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/cabazitaxel (or cabazitaxel salt or acid) in the complex is: 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/cabazitaxel (or cabazitaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising αPRTX and another anti-metabolite, or a salt or acid thereof. An anti-metabolite is a chemical with a structure that is similar to a metabolite required for normal biochemical reactions, yet different enough to interfere with one or more normal functions of cells, such as cell division. In some embodiments, the disclosure provides a complex comprising αPRTX and raltitrexed (RTX), or a salt or acid thereof. In some embodiments, the disclosure provides a complex comprising αPRTX and an anti-metabolite selected from the group consisting of, gemcitabine, fluorouracil, capecitabine, an antifolate (e.g., methotrexate, raltitrexed), tegafur, cytosine arabinoside, thioguanine, 5-azacytidine, 6-mercaptopurine, azathioprine, 6-thioguanine, pentostatin, fludarabine phosphate, and cladribine, as well as pharmaceutically acceptable salt or acids, acids, or derivatives of any of these. In some embodiments, the molar ratio of αPRTX/anti-metabolite (or anti-metabolite salt or acid) in the complex is in the range 1-20:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/anti-metabolite (or anti-metabolite salt or acid) in the complex is in the range 1-10:1, or any range therein between. In further embodiments, the molar ratio of αPRTX/anti-metabolite (or anti-metabolite salt or acid) in the complex is in the range 2-8:1, or any range therein between. In some embodiments, the molar ratio of αPRTX/anti-metabolite (or anti-metabolite salt or acid) in the complex is 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In some embodiments, the molar ratio of αPRTX/anti-metabolite (or anti-metabolite salt or acid) in the complex is 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In additional embodiments, the αPRTX/anti-metabolite (or anti-metabolite salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex of αPRTX (e.g., an αPRTX disclosed herein) and a cyclodextrin. Cyclodextrins (CDs) are groups of cyclic oligosaccharides which have been shown to improve physicochemical properties of many drugs through formation of complexes. CDs are cyclic oligosaccharides composed of several D-glucose units linked by α-(1,4) bonds. This cyclic configuration provides a hydrophobic internal cavity and gives the CDs a truncated cone shape. Many hydroxyl groups are situated on the edges of the ring which make the CDs both lipophilic and soluble in water. As a result, CDs are able to form complexes with a wide variety of hydrophobic agents, and thus change the physical-chemical properties of these complexed agents. 
     The terms “cyclodextrin” or “CD” unless otherwise specified herein, refer generally to a parent or derivatized cyclic oligosaccharide containing a variable number of (α-1,4)-linked D-glucopyranoside units that is able to form a complex with a raltitrexed-PG. Each cyclodextrin glucopyranoside subunit has secondary hydroxyl groups at the 2 and 3 positions and a primary hydroxyl group at the 6-position. The terms “parent,” “underivatized,” or “inert,” cyclodextrin refer to a cyclodextrin containing D-glucopyranoside units having the basic formula C 6 H 12 O 6  and a glucose structure without any additional chemical substitutions (e.g., α-cyclodextrin consisting of 6 D-glucopyranoside units, a β-cyclodextrin cyclodextrin consisting of 7 D-glucopyranoside units, and a γ-cyclodextrin cyclodextrin consisting of 8 D-glucopyranoside units). The physical and chemical properties of a parent cyclodextrin can be modified by derivatizing the hydroxyl groups with other functional groups. Any substance located within the cyclodextrin internal phase is said to be “complexed” with the cyclodextrin, or to have formed a complex (inclusion complex) with the cyclodextrin. 
     As used herein, there are no particular limitations on the cyclodextrin component of the αPRTX/cyclodextrin complexes so long as the cyclodextrins can form complexes with the αPRTX. In particular embodiments, the cyclodextrins have been derivatized to bear ionizable (e.g., weakly basic and/or weakly acidic) functional groups to facilitate complex formation with αPRTX and/or liposome encapsulation. 
     Modifications of the hydroxyl groups of cyclodextrins, such as those facing away from the cyclodextrin interior phase, with ionizable chemical groups is known to facilitate the loading of cyclodextrins and therapeutic agents complexed with the cyclodextrins. In some embodiments, the cyclodextrin of the αPRTX/cyclodextrin complex has at least 2, 3, 4, 5, 6, 6, 7, 8, 9, or 10, hydroxyl group substituted with an ionizable chemical group. The term “charged cyclodextrin” refers to a cyclodextrin having one or more of its hydroxyl groups substituted with a charged moiety. Such a moiety can itself be a charged group or it can comprise an organic moiety (e.g., a C 1 -C 6  alkyl or C 1 -C 6  alkyl ether moiety) substituted with one or more charged moieties. 
     In some embodiments, the “ionizable” or “charged” moieties of a CD derivative are weakly ionizable. Weakly ionizable moieties are those that are either weakly basic or weakly acidic. Weakly basic functional groups (W) have a pKa of between about 6.0-9.0, 6.5-8.5, 7.0-8.0, 7.5-8.0, and any range in between inclusive according to CH3-W. Similarly, weakly acidic functional groups (X) have a log dissociation constant (pKa) of between about 3.0-7.0, 4.0-6.5, 4.5-6.5, 5.0-6.0, 5.0-5.5, and any range in between inclusive according to CH3-X. Representative anionic moieties include, without limitation, carboxylate, carboxymethyl, succinyl, sulfonyl, phosphate, sulfoalkyl ether, sulphate carbonate, thiocarbonate, dithiocarbonate, phosphate, phosphonate, sulfonate, nitrate, and borate groups. Representative cationic moieties include, without limitation, amino, guanidine, and quarternary ammonium groups. 
     In another embodiment, the derivatized cyclodextrin is a “polyanion” or “polycation.” A polyanion is a derivatized cyclodextrin having more than one negatively charged group resulting in net a negative ionic charge of more than two units. A polycation is a derivatized cyclodextrin having more than one positively charged group resulting in net positive ionic charger of more than two units. 
     In another embodiment, the derivatized cyclodextrin is a “chargeable amphiphile.” By “chargeable” is meant that the amphiphile has a pK in the range pH 4 to pH 8 or 8.5. A chargeable amphiphile may therefore be a weak acid or base. By “amphoteric” herein is meant a derivatized cyclodextrin having a ionizable groups of both anionic and cationic character wherein: (a) at least one, and optionally both, of the cation and anionic amphiphiles is chargeable, having at least one charged group with a pK between 4 and 8 to 8.5, (b) the cationic charge prevails at pH 4, and (c) the anionic charge prevails at pH 8 to 8.5. 
     In some embodiments, the “ionizable” or “charged” derivatized cyclodextrin as a whole, whether polyionic, amphiphilic, or otherwise, are weakly ionizable (i.e., have a pKai of between about 4.0-8.5, 4.5-8.0, 5.0-7.5, 5.5-7.0, 6.0-6.5, and any range in between inclusive). 
     Any one, some, or all hydroxyl groups of any one, some or all α-D-glucopyranoside units of a cyclodextrin can be modified to an ionizable chemical group as described herein. Since each cyclodextrin hydroxyl group differs in chemical reactivity, reaction with a modifying moiety can produce an amorphous mixture of positional and optical isomers. Alternatively, certain chemistry can allow for pre-modified α-D-glucopyranoside units to be reacted to form uniform products. 
     The aggregate substitution that occurs for cyclodextrin derivatives in a mixture is described by a term referred to as the degree of substitution. For example, a 6-ethylenediamino-β-cyclodextrin with a degree of substitution of seven would be composed of a distribution of isomers of 6-ethylenediamino-β-cyclodextrin in which the average number of ethylenediamino groups per 6-ethylenediamino-β-cyclodextrin molecule is seven. The degree of substitution for a cyclodextrin derivative mixture can routinely be determined using mass spectrometry or nuclear magnetic resonance spectroscopy. 
     In one embodiment, at least one hydroxyl moieties facing away from the cyclodextrin interior is substituted with an ionizable chemical group. For example, the C2, C3, C6, C2 and C3, C2 and C6, C3 and C6, and all three of C2-C3-C6 hydroxyls of at least one α-D-glucopyranoside unit are substituted with an ionizable chemical group. Any such combination of hydroxyls can similarly be combined with at least two, three, four, five, six, seven, eight, nine, ten, eleven, up to all of the alpha-D-glucopyranoside units in the modified cyclodextrin as well as in combination with any degree of substitution described herein. One such derivative is a sulfoalkyl ether cyclodextrin (SAE-CD). Sulfobutyl ether derivatives of beta cyclodextrin (SBE-β-CD) have been demonstrated to have significantly improved aqueous solubility compared to the parent cyclodextrin. 
     Additional cyclodextrin derivatives that may be complexed with therapeutic agents in the disclosed liposome compositions include sugammadex or Org-25969, in which the 6-hydroxy groups on γ-CD have been replaced by carboxythio acetate ether linkages, and hydroxybutenyl-β-CD. Alternative forms of cyclodextrin include: 2,6-Di-O-methyl-β-CD (DIMEB), 2-hydroxylpropyl-3-cyclodextrin (HP-β-CD), randomly methylated-β-cyclodextrin (RAMEB), sulfobutyl ether β-cyclodextrin (SBE-β-CD), and sulfobutylether-γ-cyclodextrin (SBEγCD), sulfobutylated beta-cyclodextrin sodium salt, (2-Hydroxypropyl)-alpha-cyclodextrin, (2-Hydroxypropyl)-beta-cyclodextrin, (2-Hydroxypropyl)-γ-cyclodextrin, 2,6-di-O-methyl)-beta-cyclodextrin (DIMEB-50 Heptakis), 2,3,6-tri-O-methyl)-beta-cyclodextrin (TRIMEB Heptakis), methyl-beta-cyclodextrin, octakis (6-deoxy-6-iodo)-γ-cyclodexrin, and, octakis (6-deoxy-6-bromo)-gamma-cyclodexrin. 
     In some embodiments, the cyclodextrin(s) has a high solubility in water in order to facilitate entrapment of a larger amount of the cyclodextrin in the liposome internal phase. In some embodiments, the water solubility of the cyclodextrin is at least 10 mg/mL, 20 mg/mL, 30 mg/mL, 40 mg/mL, 50 mg/mL, 60 mg/mL, 70 mg/mL, 80 mg/mL, 90 mg/mL, 100 mg/mL or higher. In some embodiments, the water solubility of the cyclodextrin(s) is within a range of 10-150 mg/mL, 20-100 mg/mL 20-75 mg/mL, and any range in between inclusive. 
     In some embodiments, a large association constant between the cyclodextrin and the αPRTX and/or other therapeutic agent complexed with cyclodextrin is preferable and can be obtained by selecting the number of glucose units in the cyclodextrin based on the size of the therapeutic agent (see, for example, Albers et al., Crit. Rev. Therap. Drug Carrier Syst. 12:311-337 (1995); Stella et al., Toxicol. Pathol. 36:30-42 (2008). When the association constant depends on pH, the cyclodextrin can be selected such that the association constant becomes large at the pH of the liposome internal phase. As a result, the solubility (nominal solubility) of the therapeutic agent in the presence of cyclodextrin can be further improved. In some embodiments, the association constant of the cyclodextrin with the therapeutic agent is 100, 200, 300, 400, 500, 600, 700, 800, 900, 1,000, or higher. In some embodiments, the association constant of the cyclodextrin with the therapeutic agent is in the range 100-1, 200, 200-1,000, 300-750, and any range therein between. 
     In some embodiments, the cyclodextrin of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is underivatized. 
     In some embodiments, the cyclodextrin of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is derivatized. In further embodiments, the cyclodextrin derivative of the complex has the structure of Formula I: 
     
       
         
         
             
             
         
       
     
     wherein: n is 4, 5, or 6;
 
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9  are each, independently, —H, a straight chain or branched C 1 -C 8 -alkylene group, or an optionally substituted straight-chain or branched C 1 -C 6  group, wherein at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8  and R 9  is a straight-chain or branched C 1 -C 8 -alkylene (e.g., C 1 -C 8 -(alkylene)-SO 3   −  group);
 
     In some embodiments, the cyclodextrin derivative of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex has the structure of formula II: 
     
       
         
         
             
             
         
       
     
     wherein: n is 4, 5, or 6;
 
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9  are each, independently, —O— or a —O—(C 2 -C 6  alkylene)-SO 3 — group; wherein at least one of R 1  and R 2  is independently a —O—(C 2 -C 6  alkylene)-SO 3 — group; and S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 8 , S 5 , and S 9  are each, independently, a pharmaceutically acceptable cation. In further embodiments, the pharmaceutically acceptable cation is selected from: an alkali metal such as Li + , Na + , or K + ; an alkaline earth metal such as Ca +2 , or Mg +2  and ammonium ions and amine cations such as the cations of (C1-C6)-alkylamines, piperidine, pyrazine, (C1-C6)-alkanolamine and (C4-C8)-cycloalkanolamine. In some embodiments, at least one of R1 and R2 is independently a —O—(C2-C6 alkylene)-SO3- group that is a —O—(CH 2 ) m SO3- group, wherein m is 2 to 6, preferably 2 to 4, (e.g., —O—CH2CH2CH2S03- or —O—CH2CH2CH2CH2S03-); and S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 , S 8 , and S 9  are each, independently, H or a pharmaceutically cation which includes for example, alkali metals (e.g., Li + , Na + , K + ) alkaline earth metals (e.g., Ca +2 , Mg +2 ), ammonium ions and amine cations such as the cations of (C 1 -C 6 )-alkylamines, piperidine, pyrazine, (C 1 -C 6 )-alkanol-amine and (C 4 -C 8 )-cycloalkanolamine:
 
     In some embodiments, a cyclodextrin derivative of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is a cyclodextrin disclosed in U.S. Pat. Nos. 6,133,248, 5,874,418, 6,046,177, 5,376,645, 5,134,127, 7,034,013, 6,869,939; and Intl. Appl. Publ. No. WO 02005/117911, the contents each of which is herein incorporated by reference in its priority. 
     In some embodiments, the cyclodextrin derivative of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is a sulfoalkyl ether cyclodextrin. In some embodiments, the cyclodextrin derivative of complex is a sulfobutyl ether-3-cyclodextrin such as CAPTISOL® (CyDex Pharma. Inc., Lenexa, Kans. Methods for preparing sulfobutyl ether-3-cyclodextrin and other sulfoalkyl ether cyclodextrins are known in the art. 
     In some embodiments, the cyclodextrin derivative in of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is a compound of Formula III: 
     
       
         
         
             
             
         
       
     
     wherein R equals:
         (a) (H) 21-X  or (—(CH 2 ) 4 —SO 3 Na)x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0; (b) (H) 21-X  or (—(CH 2 CH(OH)CH 3 )x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0; (c) (H) 21-X  or (sulfoalkyl ethers)x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0; or (d) (H) 21-X  or (—(CH 2 ) 4 —SO 3 Na)x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0.       

     In additional embodiments, the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     III. αPRTX Delivery Vehicles 
     In alternative embodiments, the disclosure provides αPRTX delivery systems and their use to deliver a payload of αPRTX to a cell or cells in vitro or in vivo. In some embodiments, αPRTX is complexed with or incorporated into a delivery vehicle. Such delivery vehicles are known in the art and include, but are not limited to, liposomes, lipospheres, polymers, peptides, proteins, antibodies (e.g., ADCs such as Antibody-αPRTX conjugates), cellular components, cyclic oligosaccharides (e.g., cyclodextrins), nanoparticles (e.g., lipid nanoparticles, biodegradable nanoparticles, and core-shell nanoparticles), lipoprotein particles, and combinations thereof. In particular embodiments, the delivery vehicle is a liposome. In other particular embodiments, the delivery vehicle is an antibody or an antigen binding antibody fragment. 
     A. Liposomes 
     In some embodiments, the disclosure provides liposomal compositions that comprise a liposome encapsulating (i.e., filled with) an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, a liposome in the liposomal composition comprises a αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups (including the glutamyl group in raltitrexed). In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups in the L-form. In other embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form. In further embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups that have a gamma carboxyl linkage. In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises at least one glutamyl group that has both an alpha carboxyl linkage and a gamma carboxyl linkage. In some embodiments, the liposomal composition comprises a liposome comprising a α pentaglutamated RTX. In further embodiments, the liposome comprises an L-α pentaglutamated RTX, a D-α pentaglutamated RTX, or an L- and D-α pentaglutamated RTX. In some embodiments, the liposomal composition comprises a liposome comprising a α hexaglutamated RTX (Lp-αPRTX). In further embodiments, the liposome comprises an L-α hexaglutamated RTX, a D-α hexaglutamated RTX, or an L- and D-α hexaglutamated RTX. In some embodiments, the liposomal composition comprises a liposome that is anionic or neutral. In some embodiments, the liposomal composition comprises a liposome that is cationic. In some embodiments, the Lp-αPRTX composition is unpegylated. In some embodiments, the Lp-αPRTX composition is non-targeted (NTLp-αPRTX). In other embodiments, the Lp-αPRTX composition is targeted (TLp-αPRTX). In some embodiments, the liposomal composition comprises a liposome having a diameter in the range of 20 nm to 500 nm, or any range therein between. In some embodiments, the liposomal composition comprises a liposome having a diameter in the range of 20 nm to 400 nm, or any range therein between. In some embodiments, the liposomal composition comprises a liposome having a diameter in the range of 20 nm to 300 nm, or any range therein between. In some embodiments, the liposomal composition comprises a liposome having a diameter in the range of 20 nm to 200 nm, or any range therein between. In further embodiments, the liposomal composition comprises a liposome having a diameter in the range of 20 nm to 150 nm, or any range therein between. In further embodiments, the liposomal composition comprises a liposome having a diameter in the range of 80 nm to 120 nm, or any range therein between. In additional embodiments, 30-70%, 30-60%, or 30-50% w/w alpha polyglutamated raltitrexed, or any range therein between, is encapsulated (entrapped) in the Lp-αPRTX. In some embodiments, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% or more than 75%, alpha polyglutamated raltitrexed, is encapsulated in the Lp-αPRTX during the process of preparing the liposomes. 
     In some embodiments, the provided liposomes further comprise an immunostimulatory agent, a detectable marker, or both disposed on its exterior. The immunostimulatory agent or detectable marker can be ionically bonded or covalently bonded to an exterior of the liposome, including, for example, optionally to a steric stabilizer component of the liposome. 
     The terms “immunostimulatory agents”, also known as “immunostimulants”, and “immunostimulators”, refer to substances that stimulate an immune (including a preexisting immune response) by inducing activation or increasing activity of any of the components of the immune system. These immunostimulatory agents can include one or more of a hapten, an adjuvant, a protein immunostimulating agent, a nucleic acid immunostimulating agent, and a chemical immunostimulating agent. Many adjuvants contain a substance designed to stimulate immune responses, such as lipid A, Bortadella pertussis or  Mycobacterium tuberculosis  derived proteins. Certain adjuvants are commercially available as, for example, Freund&#39;s Incomplete Adjuvant and Complete Adjuvant (Difco Laboratories, Detroit, Mich.); Merck Adjuvant 65 (Merck and Company, Inc., Rahway, N.J.); AS-2 (SmithKline Beecham, Philadelphia, Pa.); aluminum salts such as aluminum hydroxide gel (alum) or aluminum phosphate; salts of calcium, iron or zinc; an insoluble suspension of acylated tyrosine; acylated sugars; cationically or anionically derivatized polysaccharides; polyphosphazenes; biodegradable microspheres; monophosphoryl lipid A and quil A; IFN-gamma, IFN-alpha, FLT3-ligand; and immunostimulatory antibodies (e.g., anti-CTLA-4, anti-CD28, anti-CD3. Cytokines, such as GM-CSF, interleukin-2, -7, -12, and -15, and other like growth factors, can also be used as adjuvants. In a preferred embodiment, the immunostimulant can be at least one selected from the group consisting of fluorescein, DNP, beta glucan, beta-1,3-glucan, beta-1,6-glucan. In an additional preferred embodiment, the immunostimulant is a Toll-like receptor (TLR) modulating agent. In further embodiments, the Toll-like receptor (TLR) modulating agent is one or more of: an oxidized low-density lipoprotein (e.g., OXPAC, PGPC), an eritoran lipid (e.g., E556), and a resolvin. In some embodiments, the liposomes comprise fluorescein isothiocyanate (FITC) which, based on our experiments, surprisingly serves as both an immunostimulant and a detectable marker. 
     In some embodiments, the liposomes comprise a detectable marker. A detectable marker may, for example, include, at least, a radioisotope, a fluorescent compound, a bioluminescent compound, chemiluminescent compound, a metal chelator, an enzyme, a dye, an ink, a magnetic compound, a biocatalyst or a pigment that is detectable by any suitable means known in the art, e.g., magnetic resonance imaging (MRI), optical imaging, fluorescent/luminescent imaging, and/or nuclear imaging techniques. 
     In some embodiments, the immunostimulatory agent and/or detectable marker is attached to the exterior by co-incubating it with the liposome. For example, the immunostimulatory agent and/or detectable marker may be associated with the liposomal membrane by hydrophobic interactions or by an ionic bond such as an avidin/biotin bond or a metal chelation bond (e.g., Ni-NTA). Alternatively, the immunostimulatory agent or detectable marker may be covalently bonded to the exterior of the liposome such as, for example, by being covalently bonded to a liposomal component or to the steric stabilizer which is the PEG. 
     In some embodiments, the liposomes further comprise an agent that increases the uptake of liposomes into a cellular compartment of interest including the cytosol. 
     In some embodiments, the liposomes comprise a mitochondrial-targeting agent. In some embodiments, the liposomes comprise triphenylphosphonium (TPP). Methods and mechanisms for surface functionalizing liposomes with TPP are known in the art (e.g., attaching TPP to the lipid anchor via a peg spacer group and modifying TPP with a stearyl group (stearyl triphenylphosphonium (STPP)). In some embodiments, the liposomes comprise high-density octa-arginine. In some embodiments, the liposomes comprise sphingomyelin and/or a sphingomyelin metabolite. Sphingomyelin metabolite used to formulate the liposomes of the present invention can include, for example ceramide, sphingosine or sphingosine 1-phosphate. In some embodiments, the liposomes comprise Rhodamine 123. In some embodiments, the liposomes comprise, a mitochondria penetrating peptide. In some embodiments, the liposomes comprise, a mitochondria penetrating agent selected from the group consisting of: a mitofusin peptide, a mitochondrial targeting signal peptide, Antennapedia helix III homeodomain cell-penetrating peptide (ANT) (e.g., comprising RQIKIWFQNRRMKWKKRKKRRQR RR (SEQ ID NO:1), RKKRRXR RRGC where X is any natural or non-natural amino acid (SEQ ID NO:2), CCGCCAAGAAGCG (SEQ ID NO:3), GCGTGCACACGCGCGTAGACTTCCCCC GCAAGTCACTCGTTAGCCCGCCAAGAAGCGACCCCTCCGGGGCGAGCTGAG CGGCGTGGCGCGGGGGCGTCAT (SEQ ID NO:4), ACGTGCATACGCACGTA GACATTCCCCGCTTCCCACTCCAAAGTCCGCCAAGAAGCGTATCCCGCTGAG CGGCGTGGCGCGGGGGCGTCATCCGTCAGCTC (SEQ ID NO:5), or ACTTCCC CCGCAAGTCACTCGTTAGCCCGCCAAGAAGCGACCCCTCCGGGGCGAGCTG (SEQ ID NO:6)), or a mitochondrial penetrating fragment thereof. 
     In some embodiments, liposomes in the provided liposome compositions comprise a mitochondria penetrating agent selected from the group: a guanidine-rich peptoid, tetraguanidinium, triguanidinium, diguanidinium, monoguanidinium, a guanidine-rich polycarbamate, a beta-oligoarginine, a proline-rich dendrimer, and a phosphonium salt (e.g., methyltriphenyl-phosphonium and/or tetraphenylphosphonium). 
     In some embodiments, liposomes in the provided liposome compositions comprise sphingomyelin and/or stearyl-octa-arginine. In some embodiments, the liposomes comprise sphingomyelin and/or stearyl-octa-arginine. In some embodiments, the liposomes comprise DOPE, sphingomyelin, stearyl-octa-arginine sphingomyelin and stearyl-octa-arginine. In some embodiments, the liposomes comprise DOPE, sphingomyelin, stearyl-octa-arginine sphingomyelin and stearyl-octa-arginine at a molar ratio of 9:2:1. In some embodiments, the liposomes comprise the MITO-porter® system or a variant thereof. 
     In some embodiments, liposomes in the provided liposome compositions comprise an agent such as a cell penetrating agent that that facilitates delivery of the liposome across a cell membrane and provides the liposome with the ability to bypass the endocytic pathway and the harsh environment of lysosomes. Cell penetrating agents are known in the art and can routinely be used and adapted for manufacture and use of the provided liposome compositions. In some embodiments, the cell penetrating/lysosome bypassing agent is chloroquine. In some embodiments, the cell penetrating agent is a cell penetrating peptide. In some embodiments, liposomes in the provided liposome compositions comprise a cell penetrating agent selected from the group: RKKRRQRRR (SEQ ID NO:7), GRKKRRQRRRTPQ (SEQ ID NO:8), YGRKKRRQRRR (SEQ ID NO:9), AAVAL LPAVLLALLA (SEQ ID NO:10), MGLGLHLLVLAAALQ (SEQ ID NO:11), GALFL GFLGAAGSTM (SEQ ID NO:12), AGYLLGKINLKALAALAKKIL (SEQ ID NO:13), RVIRVWFQNKRCKDKK (SEQ ID NO:14), RQIKIWFQNRRMKWKK (SEQ ID NO:15), GLFEAIAGFIENGWEGMIDG (SEQ ID NO:16), GWTLNSAGYLLGKIN (SEQ ID NO:17), RSQSRSRYYRQRQRS (SEQ ID NO:18), LAIPEQEY (SEQ ID NO:19), LGIAEQEY (SEQ ID NO:20), LGIPAQEY (SEQ ID NO:21), LGIPEAEY (SEQ ID NO:22), LGIPEQAY (SEQ ID NO:23), LGIAEAEY (SEQ ID NO:24), LGIPEAAY (SEQ ID NO:25), LGIAEQAY (SEQ ID NO:26), LGIAEAAY (SEQ ID NO:27), LLIILRRRIRKQAHAHSK (SEQ ID NO:28), LKALAALAKKIL (SEQ ID NO:29), KLALKLALKALKAALKLA (SEQ ID NO:30), KETWWETWWTEWSQPKKKRKV (SEQ ID NO:31), DHQLNPAF (SEQ ID NO:32), DPKGDPKG (SEQ ID NO:33), VTVTVTVTVTGKGDPKPD (SEQ ID NO:34), RQIKIWFQNRRMKWKK (SEQ ID NO:35), GRKKRRQRRRPPQ (SEQ ID NO:36), GWTLNSAGYLLGKINLKALAAL AKKIL (SEQ ID NO:37), GRKKRRQRRR (SEQ ID NO:38), RRRRRRR (SEQ ID NO:39), RRRRRRRR (SEQ ID NO:40), RRRRRRRRR (SEQ ID NO:41), RRRRRRRR RR (SEQ ID NO:42), RRRRRRRRRRR (SEQ ID NO:43), and YTIWMPENPRPGT PCDIFTNSRGKRASNGGG G(R)n wherein n=2-15 R in the L- and/or D-form (SEQ ID NO:44), or a cell permeating fragment thereof. 
     As discussed above, the liposomes may comprise a steric stabilizer that can increase their longevity in circulation. For those embodiments, which incorporate a steric stabilizer, the steric stabilizer may be at least one member selected from the group consisting of polyethylene glycol (PEG), poly-L-lysine (PLL), monosialoganglioside (GM1), poly(vinyl pyrrolidone) (PVP), poly(acrylamide) (PAA), poly(2-methyl-2-oxazoline), poly(2-ethyl-2-oxazoline), phosphatidyl polyglycerol, poly[N-(2-hydroxypropyl) methacrylamide], amphiphilic poly-N-vinylpyrrolidones, L-amino-acid-based polymer, oligoglycerol, copolymer containing polyethylene glycol and polypropylene oxide, Poloxamer 188, and polyvinyl alcohol. In some embodiments, the steric stabilizer or the population of steric stabilizer is PEG. In one embodiment, the steric stabilizer is a PEG. In a further embodiment, the PEG has a number average molecular weight (Mn) of 200 to 5000 daltons. These PEG(s) can be of any structure such as linear, branched, star or comb structure and are commercially available. 
     In some embodiments, the liposomal composition comprises a pegylated liposome (PLp-αPRTX). In some embodiments, a pegylated liposome in the liposomal composition comprises a αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups in the L-form. In other embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form. In further embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups that have a gamma linkage. In some embodiments, at least one glutamyl group has both an alpha linkage and a gamma linkage. In some embodiments, the liposomal composition comprises a pegylated liposome comprising an α pentaglutamated RTX. In further embodiments, the liposome comprises an L-α pentaglutamated RTX, a D-α pentaglutamated RTX, or an L- and D-α pentaglutamated RTX. In some embodiments, the liposomal composition comprises a pegylated liposome comprising an α hexaglutamated RTX. In further embodiments, the liposome comprises an L-α hexaglutamated RTX, a D-α hexaglutamated RTX, or an L- and D-α hexaglutamated RTX. In some embodiments, the liposomal composition comprises a pegylated liposome that is anionic or neutral. In some embodiments, the liposomal composition comprises a pegylated liposome that is cationic. In some embodiments, the PLp-αPRTX composition is non-targeted (NTPLp-αPRTX). In other embodiments, the PLp-αPRTX composition is targeted (TPLp-αPRTX). In additional embodiments, the liposomal composition comprises a pegylated liposome that comprises 30-70%, 30-60%, or 30-50% liposome entrapped alpha polyglutamated raltitrexed, or any range therein between. In some embodiments, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha polyglutamated raltitrexed is encapsulated (entrapped) in the PLp-αPRTX. In some embodiments, the liposomal composition comprises a pegylated liposome having a diameter in the range of 20 nm to 500 nm. In some embodiments, the liposomal composition comprises a pegylated liposome having a diameter in the range of 20 nm to 200 nm. In further embodiments, the liposomal composition comprises a pegylated liposome having a diameter in the range of 80 nm to 120 nm. 
     In some embodiments, greater than 30%, 40%, 50%, 60%, 70%, 80% or 90% of the polyglutamated raltitrexed in the composition has 4-10, 4-6, or more than 5, glutamyl groups. In some embodiments, greater than 30%, 40%, 50%, 60%, 70%, 80% or 90%, of the polyglutamated raltitrexed in a provided liposomal composition is tetraglutamated. In some embodiments, greater than 30%, 40%, 50%, 60%, 70%, 80% or 90%, of the polyglutamated raltitrexed in a provided liposomal composition is pentaglutamated. In some embodiments, greater than 30%, 40%, 50%, 60%, 70%, 80% or 90%, of the polyglutamated raltitrexed in a provided liposomal composition is hexaglutamated. 
     In some embodiments, the alpha polyglutamated raltitrexed compositions (e.g., polyglutamates and delivery vehicles such as liposomes containing the polyglutamates) are in an aqueous solution. In some embodiments, the αPRTX composition is administered in a liposomal composition at a dose of between 0.005 and 5000 mg of αPRTX per square meter (m 2 ) of body surface area, or any range therein between. In further embodiments, the αPRTX composition is administered in a liposomal composition at a dose of between 0.1 and 1000 mg αPRTX/meter squared of body surface area, or any range therein between. 
     (1) Liposome Composition 
     The lipids and other components of the liposomes contained in the liposomal compositions can be any lipid, lipid combination and ratio, or combination of lipids and other liposome components and their respective ratios known in the art. However, it will be understood by one skilled in the art that liposomal encapsulation of any particular drug, such as, and without limitation, the alpha polyglutamated RTX discussed herein, may involve substantial routine experimentation to achieve a useful and functional liposomal formulation. In general, the provided liposomes may have any liposome structure, e.g., structures having an inner space sequestered from the outer medium by one or more lipid bilayers, or any microcapsule that has a semi-permeable membrane with a lipophilic central part where the membrane sequesters an interior. The lipid bilayer can be any arrangement of amphiphilic molecules characterized by a hydrophilic part (hydrophilic moiety) and a hydrophobic part (hydrophobic moiety). Usually amphiphilic molecules in a bilayer are arranged into two dimensional sheets in which hydrophobic moieties are oriented inward the sheet while hydrophilic moieties are oriented outward. Amphiphilic molecules forming the provided liposomes can be any known or later discovered amphiphilic molecules, e.g., lipids of synthetic or natural origin or biocompatible lipids. The liposomes can also be formed by amphiphilic polymers and surfactants, e.g., polymerosomes and niosomes. For the purpose of this disclosure, without limitation, these liposome-forming materials also are referred to as “lipids”. 
     The liposome composition formulations provided herein can be in liquid or dry form such as a dry powder or dry cake. The dry powder or dry cake may have undergone primary drying under, for example, lyophilization conditions or optionally, the dry cake or dry powder may have undergone both primary drying only or both primary drying and secondary drying. In the dry form, the powder or cake may, for example, have between 1% to 6% moisture, for example, such as between 2% to 5% moisture or between 2% to 4% moisture. One example method of drying is lyophilization (also called freeze-drying, or cyrodessication). Any of the compositions and methods of the disclosure may include liposomes, lyophilized liposomes or liposomes reconstituted from lyophilized liposomes. In some embodiments, the disclosed compositions and methods include one or more lyoprotectants or cryoprotectants. These protectants are typically polyhydroxy compounds such as sugars (mono-, di-, and polysaccharides), polyalcohols, and their derivatives, glycerol, or polyethyleneglycol, trehalose, maltose, sucrose, glucose, lactose, dextran, glycerol, or aminoglycosides. In further embodiments, the lyoprotectants or cryoprotectants comprise up to 10% or up to 20% of a solution outside the liposome, inside the liposome, or both outside and inside the liposome. 
     In some embodiments, the liposomes include a steric stabilizer that increases their longevity in circulation. One or more steric stabilizers such as a hydrophilic polymer (Polyethylene glycol (PEG)), a glycolipid (monosialoganglioside (GM1)) or others occupies the space immediately adjacent to the liposome surface and excludes other macromolecules from this space. Consequently, access and binding of blood plasma opsonins to the liposome surface are hindered, and thus interactions of macrophages with such liposomes, or any other clearing mechanism, are inhibited and longevity of the liposome in circulation is enhanced. In some embodiments, the steric stabilizer or the population of steric stabilizers is a PEG or a combination comprising PEG. In further embodiments, the steric stabilizer is a PEG or a combination comprising PEG with a number average molecular weight (Mn) of 200 to 5000 daltons. These PEG(s) can be of any structure such as linear, branched, star or comb structure and are commercially available. 
     The diameter of the disclosed liposomes is not particularly limited. In some embodiments, the liposomes have a diameter in the range of for example, 30-150 nm (nanometer). In other embodiments, the liposomes have a diameter in the range of 40-70 nm. 
     The properties of liposomes are influenced by the nature of lipids used to make the liposomes. A wide variety of lipids have been used to make liposomes. These include cationic, anionic and neutral lipids. In some embodiments, the liposomes comprising the alpha polyglutamated raltitrexed are anionic or neutral. In other embodiments, the provided liposomes are cationic. The determination of the charge (e.g., anionic, neutral or cationic) can routinely be determined by measuring the zeta potential of the liposome. The zeta potential of the liposome can be positive, zero or negative. In some embodiments, the zeta potential of the liposome is less than or equal to zero. In some embodiments, the zeta potential of the liposome is in a range of 0 to −150 mV. In another embodiment, the zeta potential of the liposome is in the range of −30 to −50 mV. 
     In some embodiments, cationic lipids are used to make cationic liposomes which are commonly used as gene transfection agents. The positive charge on cationic liposomes enables interaction with the negative charge on cell surfaces. Following binding of the cationic liposomes to the cell, the liposome is transported inside the cell through endocytosis. 
     In some preferred embodiments, a neutral to anionic liposome is used. In a preferred embodiment, an anionic liposome is used. Using a mixture of, for example, neutral lipids such as HSPC and anionic lipids such as PEG-DSPE results in the formation of anionic liposomes which are less likely to non-specifically bind to normal cells. Specific binding to tumor cells can be achieved by using a tumor targeting antibody such as, for example, a folate receptor antibody, including, for example, folate receptor alpha antibody, folate receptor beta antibody and/or folate receptor delta antibody. 
     As an example, at least one (or some) of the lipids is/are amphipathic lipids, defined as having a hydrophilic and a hydrophobic portions (typically a hydrophilic head and a hydrophobic tail). The hydrophobic portion typically orients into a hydrophobic phase (e.g., within the bilayer), while the hydrophilic portion typically orients toward the aqueous phase (e.g., outside the bilayer). The hydrophilic portion can comprise polar or charged groups such as carbohydrates, phosphate, carboxylic, sulfato, amino, sulfhydryl, nitro, hydroxy and other like groups. The hydrophobic portion can comprise apolar groups that include without limitation long chain saturated and unsaturated aliphatic hydrocarbon groups and groups substituted by one or more aromatic, cyclo-aliphatic or heterocyclic group(s). Examples of amphipathic compounds include, but are not limited to, phospholipids, aminolipids and sphingolipids. 
     Typically, for example, the lipids are phospholipids. Phospholipids include without limitation phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phospha-tidylinositol, phosphatidylserine, and the like. It is to be understood that other lipid membrane components, such as cholesterol, sphingomyelin, and cardiolipin, can be used. 
     The lipids comprising the liposomes provided herein can be anionic and neutral (including zwitterionic and polar) lipids including anionic and neutral phospholipids. Neutral lipids exist in an uncharged or neutral zwitterionic form at a selected pH. At physiological pH, such lipids include, for example, dioleoylphosphatidylglycerol (DOPG), diacylphosphatidylcholine, diacylphosphatidylethanolamine, ceramide, sphingomyelin, cephalin, cholesterol, cerebrosides and diacylglycerols. Examples of zwitterionic lipids include without limitation dioleoylphosphatidylcholine (DOPC), dimyristoylphos-phatidylcholine (DMPC), and dioleoylphosphatidylserine (DOPS). Anionic lipids are negatively charged at physiological pH. These lipids include without limitation phosphatidylglycerol, cardiolipin, diacylphosphatidylserine, diacylphosphatidic acid, N-dode-canoyl phosphatidylethanolamines, N-succinyl phosphatidylethanolamines, N-glutarylphosphatidylethanolamines, lysylphosphatidylglycerols, palmitoyloleyolphos-phatidylglycerol (POPG), and other anionic modifying groups joined to neutral lipids. 
     Collectively, anionic and neutral lipids are referred to herein as non-cationic lipids. Such lipids may contain phosphorus but they are not so limited. Examples of non-cationic lipids include lecithin, lysolecithin, phosphatidylethanolamine, lysophosphatidylethan-olamine, dioleoylphosphati-dylethanolamine (DOPE), dipalmitoyl phosphatidyl ethanol-amine (DPPE), dimyristoylphosphoethanolamine (DMPE), distearoyl-phosphatidy 1-ethan-olamine (DSPE), palmitoyloleoyl-phosphatidylethanolamine (POPE) palmitoyl-oleoylphosphatidylcholine (POPC), egg phosphatidylcholine (EPC), distearoylphosphat-idylcholine (DSPC), dioleoylphosphatidylcholine (DOPC), dipalmitoylphospha-tidylcholine (DPPC), dioleoylphosphatidylglycerol (DOPG), dipalmitoylphospha-tidylglycerol (DPPG), palmitoyloleyolphosphatidylglycerol (POPG), 16-0-monomethyl PE, 16-0-dimethyl PE, 18-1-trans PE, palmitoyloleoyl-phosphatidylethanolamine (POPE), 1-stearoyl-2-oleoylphosphatidyethanolamine (SOPE), phosphatidylserine, phosphatidyl-inositol, sphingomyelin, cephalin, cardiolipin, phosphatidic acid, cerebrosides, dicetyl-phosphate, and cholesterol. 
     The liposomes may be assembled using any liposomal assembly method using liposomal components (also referred to as liposome components) known in the art. Liposomal components include, for example, lipids such as DSPE, HSPC, cholesterol and derivatives of these components. Other suitable lipids are commercially available for example, by Avanti Polar Lipids, Inc. (Alabaster, Ala., USA). A partial listing of available negatively or neutrally charged lipids suitable for making anionic liposomes, can be, for example, at least one of the following: DLPC, DMPC, DPPC, DSPC, DOPC, DMPE, DPPE, DOPE, DMPA•Na, DPPA•Na, DOPA•Na, DMPG•Na, DPPG•Na, DOPG•Na, DMPS•Na, DPPS•Na, DOPS•Na, DOPE-Glutaryl•(Na)2, Tetramyristoyl Cardiolipin •(Na)2, DSPE-mPEG-2000•Na, DSPE-mPEG-5000•Na, and DSPE-Maleimide PEG-2000•Na. 
     In some embodiments, the αPRTX compositions provided herein are formulated in a liposome comprising a cationic lipid. In one embodiment, the cationic lipid is selected from, but not limited to, a cationic lipid described in Intl. Appl. Publ. Nos. WO2012/040184, WO2011/153120, WO2011/149733, WO2011/090965, WO2011/043913, WO2011/022460, WO2012/061259, WO2012/054365, WO2012/044638, WO2010/080724, WO2010/21865 and WO2008/103276, U.S. Pat. Nos. 7,893,302, 7,404,969 and 8,283,333 and US Appl. Publ. Nos. US20100036115 and US20120202871; each of which is herein incorporated by reference in their entirety. In another embodiment, the cationic lipid may be selected from, but not limited to, formula A described in Intl. Appl. Publ. Nos. WO2012/040184, WO2011/153120, WO201/1149733, WO2011/090965, WO2011/043913, WO2011/022460, WO2012/061259, WO2012/054365 and WO2012/044638; each of which is herein incorporated by reference in their entirety. In yet another embodiment, the cationic lipid may be selected from, but not limited to, formula CLI-CLXXIX of International Publication No. WO2008103276, formula CLI-CLXXIX of U.S. Pat. No. 7,893,302, formula CLI-CLXXXXII of U.S. Pat. No. 7,404,969 and formula I-VI of US Patent Publication No. US20100036115; each of which is herein incorporated by reference in their entirety. As a non-limiting example, the cationic lipid may be selected from (20Z,23Z)—N,N-dimethylnonacosa-20,23-dien-10-amine, (17Z,20Z)—N,N-dimemyl-hexa-cosa-17,20-dien-9-amine, (1Z,19Z)—N5N-dimethylpentacosa-16, 19-dien-8-amine, (13Z, 16Z)—N,N-dimethyldocosa-13,16-dien-5-amine, (12Z,15Z)—N,N-dimethylhenicosa-12,15-dien-4-amine, (14Z,17Z)—N,N-dimethyltricosa-14,17-dien-6-amine, (15Z,18Z)—N,N-dimethyltetracosa-15,18-dien-7-amine, (18Z,21Z)—N,N-dimethylheptacosa-18,21-dien-10-amine, (15Z,18Z)—N,N-dimethyltetracosa-15,18-dien-5-amine, (14Z,17Z)—N,N-dimethyl-tricosa-14,17-dien-4-amine, (19Z,22Z)—N,N-dimeihyloctacosa-19,22-dien-9-amine, (18Z,21 Z)—N,N-dimethylheptacosa-18,21-dien-8-amine, (17Z,20Z)—N,N-dimethylhexa-cosa-17,20-dien-7-amine, (16Z,19Z)—N,N-dimethylpentacosa-16,19-dien-6-amine, (22Z,25Z)—N,N-dimethylhentriaconta-22,25-dien-10-amine, (21 Z,24Z)—N,N-dimethyl-triaconta-21,24-dien-9-amine, (18Z)—N,N-dimetylheptacos-18-en-10-amine, (17Z)—N,N-dimethylhexacos-17-en-9-amine, (19Z,22Z)—N,N-dimethyloctacosa-19,22-dien-7-amine, N,N-dimethylheptacosan-10-amine, (20Z,23Z)—N-ethyl-N-methylnonacosa-20,23-dien-10-amine, 1-[(11Z,14Z)-1-nonylicosa-11,14-dien-1-yl] pyrrolidine, (20Z)—N,N-dimethyl-heptacos-20-en-10-amine, (15Z)—N,N-dimethyl eptacos-15-en-10-amine, (14Z)—N,N-dimethylnonacos-14-en-10-amine, (17Z)—N,N-dimethylnonacos-17-en-10-amine, (24Z)—N,N-dimethyltritriacont-24-en-10-amine, (20Z)—N,N-dimethylnonacos-20-en-10-amine, (22Z)—N,N-dimethylhentriacont-22-en-10-amine, (16Z)—N,N-dimethylpenta-cos-16-en-8-amine, (12Z,15Z)—N,N-dimethyl-2-nonylhenicosa-12,15-dien-1-amine, (13Z,16Z)—N,N-dimethyl-3-nonyldocosa-13,16-dien-1-amine, N,N-dimethyl-1-[(1S,2R)-2-octylcyclo-propyl] eptadecan-8-amine, 1-[(1S,2R)-2-hexylcyclopropyl]-N,N-dimethyl nonadecan-10-amine, N,N-dimethyl-1-[(1S,2R)-2-octylcyclopropyl]nonadecan-10-amine, N,N-dimethyl-21-[R1S,2R)-2-octylcyclopropyl]henicosan-10-amine, N,N-dimethyl-1-[(1S,2S)-2-{[(1R,2R)-2-pentylcyclopropyl]methyl}cyclopropyl]nonadecan-10-amine, N,N-dimethyl-1-[(1S,2R)-2-octylcyclopropyl]hexadecan-8-amine, N,N-dimethyl-[(1R,2S)-2-undecylcyclopropyl] tetradecan-5-amine, N,N-dimethyl-3-{7-[(1S, 2R)-2-octylcyclo-propyl]heptyl} dodecan-1-amine, 1-[(1R,2S)-2-heptylcyclopropyl]-N,N-dimethylocta-decan-9-amine, 1-[(1S,2R)-2-decylcyclopropyl]-N,N-dimethyl-penta-decan-6-amine, N,N-dimethyl-1-[(1S,2R)-2-octylcyclopropyl]pentadecan-8-amine, R—N,N-dimethyl-1-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]-3-(octyloxy)propa-n-2-amine, S—N,N-dimethyl-1-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]-3-(octyloxy)propan-2-amine, 1-{2-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]-1-[(octyloxy)methyl]ethyl}pyrrolidine, (2S)—N,N-dimethyl-1-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]-3-[(5Z-)-oct-5-en-1-yloxy] propan-2-amine, 1-{2-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]-1-[(octyloxy)methyl] ethyl} azetidine, (2S)-1-(hexyloxy)-N,N-dimethyl-3-[(9Z,12Z)-octadeca-9,12-dien-1-ylo-xy]propan-2-amine, (2S)-1-(heptyloxy)-N,N-dimethyl-3-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]pr-opan-2-amine, N,N-dimethyl-1-(nonyloxy)-3-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]propan-2-amine, N,N-dimethyl-1-[(9Z)-octadec-9-en-1-yloxy]-3-(octyloxy) propan-2-amine; (2S)—N,N-dimethyl-1-[(6Z,9Z,12Z)-octadeca-6,9,12-trien-1-yloxy]-3-(octyloxy)propan-2-amine, (2S)-1-[(11Z,14Z)-icosa-11,14-dien-1-yloxy]-N,N-dimethyl-3-(pentyloxy)pro-pan-2-amine, (2S)-1-(hexyloxy)-3-[(11Z,14Z)-icosa-11,14-dien-1-yloxy]-N,N-dimethylprop-an-2-amine, 1-[(11Z,14Z)-icosa-11,14-dien-1-yloxy]-N,N-dimethyl 1-3-(octyloxy)propan-2-amine, 1-[(13Z,16Z)-docosa-13,16-dien-1-yloxy]-N,N-dimethyl-3-(octyloxy)propan-2- -amine, (2S)-1-[(13Z,16Z)-docosa-13,16-dien-1-yloxy]-3-(hexyloxy)-N,N-dime-thyl-propan-2-amine, (2S)-1-[(13Z)-docos-13-en-1-yloxy]-3-(hexyloxy)-N,N-dimethyl propan-2-amine, 1-[(13Z)-docos-13-en-1-yloxy]-N,N-dimethyl-3-(octyloxy) propan-2-amine, 1-[(9Z)-hexadec-9-en-1-yloxy]-N,N-dimethyl-3-(octyloxy) propan-2-amine, (2R)—N,N-dimethyl-H(1-metoylo ctyl)oxy]-3-[(9Z,12Z)-octa-deca-9,12-dien-1-yloxy]propan-2-amine, (2R)-1-[(3,7-dimethyloctyl)oxy]-N,N-dimethyl-3-R9Z,12Z)-octadeca-9,12-die-n-1-yloxylpropan-2-amine, N,N-dimethyl-1-(octyloxy)-3-({8-[(1S,2S)-2-{[(1R,2R)-2-pentylcyclopropyl]-methyl}cyclopropyl] octyl} oxy) propan-2-amine, N,N-dimethyl-1-{[-(2-oclylcyclopropyl)octyl]oxy}-3-(octyloxy) propan-2-amine and (11E,20Z,23Z)—N,N-dimethylnonacosa-11,20,2-trien-10-amine or a pharmaceutically acceptable salt or acid or stereoisomer thereof. 
     In one embodiment, the lipid may be a cleavable lipid such as those described in in Intl. Publ. No. WO2012/170889, which is herein incorporated by reference in its entirety 
     The cationic lipid can routinely be synthesized using methods known in the art and/or as described in Intl. Publ. Nos. WO2012/040184, WO2011/153120, WO2011/149733, WO2011/090965, WO201/1043913, WO2011/022460, WO2012/061259, WO2012/054365, WO2012/044638, WO2010/080724 and WO2010/21865; each of which is herein incorporated by reference in its entirety. 
     Lipid derivatives can include, for example, at least, the bonding (preferably covalent bonding) of one or more steric stabilizers and/or functional groups to the liposomal component after which the steric stabilizers and/or functional groups should be considered part of the liposomal components. Functional groups comprises groups that can be used to attach a liposomal component to another moiety such as a protein. Such functional groups include, at least, maleimide. These steric stabilizers include at least one from the group consisting of polyethylene glycol (PEG); poly-L-lysine (PLL); monosialoganglioside (GM1); poly(vinyl pyrrolidone) (PVP); poly(acrylamide) (PAA); poly(2-methyl-2-oxazoline); poly(2-ethyl-2-oxazoline); phosphatidyl polyglycerol; poly[N-(2-hydroxy-propyl) methacrylamide]; amphiphilic poly-N-vinylpyrrolidones; L-amino-acid-based polymer; and polyvinyl alcohol. 
     In some embodiments, the αPRTX compositions are formulated in a lipid-polycation complex. The formation of the lipid-polycation complex may be accomplished using methods known in the art and/or as described in U.S. Pub. No. 20120178702, herein incorporated by reference in its entirety. As a non-limiting example, the polycation may include a cationic peptide or a polypeptide such as, but not limited to, polylysine, polyornithine and/or polyarginine and the cationic peptides described in International Pub. No. WO2012/013326; herein incorporated by reference in its entirety. In another embodiment, the αPRTX is formulated in a lipid-polycation complex which further includes a neutral lipid such as, but not limited to, cholesterol or dioleoyl phosphatidylethanolamine (DOPE). 
     Since the components of a liposome can include any molecule(s) (i.e., chemical/reagent/protein) that is bound to it, in some embodiments, the components of the provided liposomes include, at least, a member selected from the group: DSPE, DSPE-PEG, DSPE-maleimide, HSPC; HSPC-PEG; HSPC-maleimide; cholesterol; cholesterol-PEG; and cholesterol-maleimide. In some embodiments, the components of the provided liposomes include DSPE, DSPE-PEG, DSPE-maleimide, HSPC; HSPC-PEG; HSPC-maleimide; cholesterol; cholesterol-PEG; and cholesterol-maleimide. In a preferred embodiment, the liposomal components that make up the liposome comprises DSPE; DSPE-FITC; DSPE-maleimide; cholesterol; and HSPC. 
     In additional embodiments, the liposomes of the liposome compositions provided herein comprise oxidized phospholipids. In some embodiments, the liposomes comprise an oxidize phospholipid of a member selected from the group consisting of phosphatidylserines, phosphatidylinositols, phosphatidylethanolamines, phosphatidyl-cholines and 1-palmytoyl-2-arachidonoyl-sn-glycero-2-phosphate. In some embodiments, the phospholipids have unsaturated bonds. In some embodiments, the phospholipids are arachidonic acid containing phospholipids. In additional embodiments, the phospholipids are sn-2-oxygenated. In additional embodiments, the phospholipids are not fragmented. 
     In some embodiments, the liposomes of the disclosed liposome compositions comprise oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphorylcholine (OxPAPC). The term “oxPAPC”, as used herein, refers to lipids generated by the oxidation of 1-palmitoyl-2-arachidonyl-sn-glycero-3-phosphorylcholine (PAPC), which results in a mixture of oxidized phospholipids containing either fragmented or full length oxygenated sn-2 residues. Well-characterized oxidatively fragmented species contain a five-carbon sn-2 residue bearing omega-aldehyde or omega-carboxyl groups. Oxidation of arachidonic acid residue also produces phospholipids containing esterified isoprostanes. oxPAPC includes HOdiA-PC, KOdiA-PC, HOOA-PC and KOOA-PC species, among other oxidized products present in oxPAPC. In further embodiments, the oxPAPCs are epoxyisoprostane-containing phospholipids. In further embodiments, the oxPAPC is 1-palmitoyl-2-(5,6-epoxyisoprostane E2)-sn-glycero-3-phosphocholine (5,6-PEIPC), 1-palmitoyl-2-(epoxy-cyclo-pentenone)-sn-glycero-3-phosphorylcholine (PECPC) and/or1-palmitoyl-2-(epoxy-isoprostane E2)-sn-glycero-4-phosphocholine (PEIPC). In some embodiments, the phospholipids have unsaturated bonds. In some embodiments, the phospholipids are arachidonic acid containing phospholipids. In additional embodiments, the phospholipids are sn-2-oxygenated. In additional embodiments, the phospholipids are not fragmented. 
     In some embodiments, the liposomal alpha polyglutamated raltitrexed composition is pegylated (i.e., a pegylated liposomal alpha polyglutamated (e.g., pentaglutamated or hexaglutamated) antifolate (PLp-αPRTX or PLp-αPRTX)). In some embodiments, the PLp-αPRTX or PLp-αPRTX is water soluble. That is, the PLp-αPRTX or PLp-αPRTX is in the form an aqueous solution. 
     In some embodiments, the liposomes of the disclosed liposome compositions comprise a lipid selected from: 1-palmitoyl-2-glutaroyl-sn-glycero-3-phosphocholine (PGPC); 1-palmitoyl-2-(9′oxo-nonanoyl)-sn-glycero-3-phosphocholine; 1-palmitoyl-2-arachinodoyl-sn-glycero-3-phosphocholine; 1-palmitoyl-2-myristoyl-sn-glycero-3-phosphocholine; 1-palmitoyl-2-hexadecyl-sn-glycero-3-phosphocholine; 1-palmitoyl-2-azelaoyl-sn-glycero-3-phosphocholine; and 1-palmitoyl-2-acetoyl-sn-glycero-3-phospho-choline. In further embodiments, the liposome comprises PGPC. 
     In some embodiments, the pH of solutions comprising the liposome composition is from pH 2 to 8, or any range therein between. In some embodiments, the pH of solutions comprising the liposome composition is from pH 5 to 8, or any range therein between. In some embodiments, the pH of solutions comprising the liposome composition is from pH 6 to 7, or any range therein between. In some embodiments, the pH of solutions comprising the liposome composition is from 6 to 7.5, from 6.5 to 7.5, from 6.7 to 7.5, or from 6.3 to 7.0, or any range therein between. 
     In some embodiments, at least one component of the liposome lipid bilayer is functionalized (or reactive). As used herein, a functionalized component is a component that comprises a reactive group that can be used to crosslink reagents and moieties to the lipid. If the lipid is functionalized, any liposome that it forms is also functionalized. In some embodiments, the reactive group is one that will react with a crosslinker (or other moiety) to form crosslinks. The reactive group in the liposome lipid bilayer is located anywhere on the lipid that allows it to contact a crosslinker and be crosslinked to another moiety (e.g., a steric stabilizer or targeting moiety). In some embodiments, the reactive group is in the head group of the lipid, including for example a phospholipid. In some embodiments, the reactive group is a maleimide group. Maleimide groups can be crosslinked to each other in the presence of dithiol crosslinkers including but not limited to dithiolthrietol (DTT). 
     It is to be understood that the use of other functionalized lipids, other reactive groups, and other crosslinkers beyond those described above is further contemplated. In addition to the maleimide groups, other examples of contemplated reactive groups include but are not limited to other thiol reactive groups, amino groups such as primary and secondary amines, carboxyl groups, hydroxyl groups, aldehyde groups, alkyne groups, azide groups, carbonyls, halo acetyl (e.g., iodoacetyl) groups, imidoester groups, N-hydroxysuccinimide esters, sulfhydryl groups, and pyridyl disulfide groups. 
     Functionalized and non-functionalized lipids are available from a number of commercial sources including Avanti Polar Lipids (Alabaster, Ala.) and Lipoid LLC (Newark, N.J.). 
     (2) Liposome Interior Space 
     In further non-limiting embodiments, the provided liposomes enclose an interior space. In some embodiments, the interior space comprises, but is not limited to, an aqueous solution. In some embodiments, the interior space comprises an alpha polyglutamated raltitrexed as provided herein. In additional embodiments, the interior space of the liposome comprises a tonicity agent. In some embodiments. In some embodiments, the concentration (weight percent) of the tonicity agent is 0.1-20%, 1-20%, 0.5-15%, 1-15%, or 1-50%, or any range therein between. In some embodiments, the interior space of the liposome includes a sugar (e.g., trehalose, maltose, sucrose, lactose, mannose, mannitol, glycerol, dextrose, fructose, etc.). In further embodiments, the concentration (weight percent) of the sugar is 0.1-20%, 1-20%, 0.5-15%, 1%-15%, or 1-50%, or any range therein between. In some embodiments, the pH of the interior space of the liposome is from pH 2 to 8, or any range therein between. In some embodiments, the pH of solutions comprising the liposome composition is from pH 5 to 8, or any range therein between. In some embodiments, the pH of solutions comprising the liposome composition is from pH 6 to 7, or any range therein between. In some embodiments, the pH of solutions comprising the liposome composition is from 6 to 7.5, from 6.5 to 7.5, from 6.7 to 7.5, or from 6.3 to 7.0, or any range therein between. In some embodiments, the interior space comprises buffer. In further embodiments, the buffer a buffer selected from HEPES, citrate, or sodium phosphate (e.g., monobasic and/or dibasic sodium phosphate). In some embodiments, the buffer is HEPES. In some embodiments, the buffer is citrate. In some embodiments, the buffer is sodium phosphate (e.g., monobasic and/or dibasic sodium phosphate). In some embodiments, the buffer is at a concentration of 15 to 200 mM, or any range therein between. In yet further embodiments, the buffer is at a concentration of between 5 to 200 mM, 15-200, between 5 to 100 mM, between 15 to 100 mM, between 5 to 50 mM, between 15 to 50 mM, between 5 to 25 mM, between 5 to 20 mM, between 5 to 15 mM, or any range therein between. In some embodiments, the buffer is HEPES at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the buffer is citrate at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the buffer is sodium phosphate at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the interior space of the liposome comprises a total concentration of sodium acetate and calcium acetate of between 5 mM to 500 mM, or 50 mM to 500 mM, or any range therein between. 
     In some embodiments, the interior space of the liposome includes trehalose. In further embodiments, the concentration weight percent of trehalose is 0.1-20%, 1-20%, 0.5-15%, 1%-15%, 5-20%, or 1-50%, or any range therein between. In yet further embodiments, the concentration (weight percent) of trehalose is 1-15%, or any range therein between. In an additional embodiment, the trehalose is present at about 5% to 20% weight percent of trehalose or any combination of one or more lyoprotectants or cryoprotectants at a total concentration of 5% to 20%. In some embodiments, the pH of solutions comprising the liposome composition is from 6 to 7.5, from 6.5 to 7.5, from 6.7 to 7.5, or from 6.3 to 7.0, or any range therein between. In some embodiments, the interior space comprises buffer. In some embodiments, the buffer is selected from HEPES, citrate, or sodium phosphate (e.g., monobasic and/or dibasic sodium phosphate). In some embodiments, the buffer is HEPES. In some embodiments, the buffer is citrate. In some embodiments, the buffer is sodium phosphate (e.g., monobasic and/or dibasic sodium phosphate). In some embodiments, the buffer is at a concentration of 15 to 200 mM, or any range therein between. In yet further embodiments, the buffer is at a concentration of between 5 to 200 mM, 15-200, between 5 to 100 mM, between 15 to 100 mM, between 5 to 50 mM, between 15 to 50 mM, between 5 to 25 mM, between 5 to 20 mM, between 5 to 15 mM, or any range therein between. In some embodiments, the buffer is HEPES at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the buffer is citrate at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the buffer is sodium phosphate at a concentration of 15 to 200 mM, or any range therein between. In additional embodiments, the interior space of the liposome comprises sodium acetate and/or calcium acetate. In some embodiments, the interior space of the liposome comprises a total concentration of sodium acetate and calcium acetate of between 5 mM to 500 mM, or 50 mM to 500 mM, or any range therein between. 
     In some embodiments, the interior space of the liposome includes dextrose. In further embodiments, the concentration weight percent of dextrose is 0.1-20%, 1-20%, 0.5-15%, 1-15%, 5-20%, or 1-50%, or any range therein between. In yet further embodiments, the concentration (weight percent) of dextrose is 1-15%, or any range therein between. In an additional embodiment, the dextrose is present at about 5% to 20% weight percent of dextrose or any combination of one or more lyoprotectants or cryoprotectants at a total concentration of 5% to 20%. In some embodiments, the pH of solutions comprising the liposome composition is from 6 to 7.5, from 6.5 to 7.5, from 6.7 to 7.5, or from 6.3 to 7.0, or any range therein between. In some embodiments, the interior space comprises buffer. In some embodiments, the buffer is selected from HEPES, citrate, or sodium phosphate (e.g., monobasic and/or dibasic sodium phosphate). In some embodiments, the buffer is HEPES. In some embodiments, the buffer is citrate. In some embodiments, the buffer is sodium phosphate (e.g., monobasic and/or dibasic sodium phosphate). In some embodiments, the buffer is at a concentration of 15 to 200 mM, or any range therein between. In yet further embodiments, the buffer is at a concentration of between 5 to 200 mM, 15-200, between 5 to 100 mM, between 15 to 100 mM, between 5 to 50 mM, between 15 to 50 mM, between 5 to 25 mM, between 5 to 20 mM, between 5 to 15 mM, or any range therein between. In some embodiments, the buffer is HEPES at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the buffer is citrate at a concentration of 15 to 200 mM, or any range therein between. In some embodiments, the buffer is sodium phosphate at a concentration of 15 to 200 mM, or any range therein between. In additional embodiments, the interior space of the liposome comprises sodium acetate and/or calcium acetate. In some embodiments, the interior space of the liposome comprises a total concentration of sodium acetate and calcium acetate of between 5 mM to 500 mM, or 50 mM to 500 mM, or any range therein between. 
     In additional embodiments, the disclosure provides liposomal compositions that comprise a liposome encapsulating (i.e., filled with) an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, a liposome in the liposomal composition comprises a αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups (including the glutamyl group in raltitrexed). In some embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups in the L-form. In other embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form. In further embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the alpha polyglutamated raltitrexed in the Lp-αPRTX comprises two or more glutamyl groups that have a gamma carboxyl linkage. In some embodiments, the liposomal composition comprises a liposome comprising an α pentaglutamated RTX. In further embodiments, the liposome comprises an L-α pentaglutamated RTX, a D-α pentaglutamated RTX, or an L- and D-α pentaglutamated RTX. In some embodiments, the liposomal composition comprises a liposome comprising an α hexaglutamated RTX (Lp-αPRTX). In further embodiments, the liposome comprises an L-α hexaglutamated RTX, a D-α hexaglutamated RTX, or an L- and D-α hexaglutamated RTX. 
     In some embodiments, the targeted pegylated liposomal alpha polyglutamated (e.g., pentaglutamated or hexaglutamated) raltitrexed comprises a medium comprising a liposome including an interior space; an aqueous alpha polyglutamated raltitrexed disposed within the interior space; and a targeting moiety comprising a protein with specific affinity for at least one folate receptor, and wherein the targeting moiety disposed at the exterior of the liposome. In some embodiments, the medium is an aqueous solution. In some embodiments, the interior space, the exterior space (e.g., the medium), or both the interior space and the medium contains one or more lyoprotectants or cryoprotectants which are listed above. In some embodiments, the cryoprotectant is mannitol, trehalose, sorbitol, or sucrose. 
     In some embodiments, the liposome encapsulating alpha polyglutamated raltitrexed (i.e., Lp-αPRTX, including PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) has an interior space that contains less than 500,000 or less than 200,000 molecules of alpha polyglutamated raltitrexed. In some embodiments, the liposome interior space contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In some embodiments, the liposome interior space contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is unpegylated and has an interior space that contains less than 500,000 or less than 200,000 molecules of alpha polyglutamated raltitrexed. In some embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is targeted and unpegylated (TLp-αPRTX) and has an interior space that contains less than 500,000 or less than 200,000 molecules of alpha polyglutamated raltitrexed. In some embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is non-targeted and unpegylated (NTLp-αPRTX) and has an interior space that contains less than 500,000 or less than 200,000 molecules of alpha polyglutamated raltitrexed. In some embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed, or any range therein between. 
     In some embodiments, the liposome encapsulates alpha polyglutamated containing 2-10 glutamyl groups (i.e., Lp-αPRTX, including PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups. In some embodiments, the liposome interior space contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In further embodiments, the liposome interior space contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In some embodiments, the liposome is unpegylated and has an interior space that contains less than 500,000 or 200,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups. In some embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In further embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In some embodiments, the liposome is targeted and unpegylated (TLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups. In some embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In further embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In some embodiments, the liposome is non-targeted and unpegylated (NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups. In some embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. In further embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha polyglutamated raltitrexed containing 2-10 glutamyl groups, or any range therein between. 
     In some embodiments, the liposome encapsulates alpha tetraglutamated raltitrexed (i.e., Lp-αPRTX, including PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha tetraglutamated raltitrexed. In some embodiments, the liposome interior space contains between 10 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In some embodiments, the liposome interior space contains between 10,000 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is unpegylated and has an interior space that contains less than 500,000 or 200,000 molecules of alpha tetraglutamated raltitrexed. In some embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is targeted and unpegylated (TLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha tetraglutamated raltitrexed. In some embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is non-targeted and unpegylated (NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha tetraglutamated raltitrexed. In some embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha tetraglutamated raltitrexed, or any range therein between. 
     In some embodiments, the liposome encapsulates alpha pentaglutamated raltitrexed (i.e., Lp-αPRTX, including PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha pentaglutamated raltitrexed. In some embodiments, the liposome interior space contains between 10 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome interior space contains between 10,000 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is unpegylated and has an interior space that contains less than 500,000 or 200,000 molecules of alpha pentaglutamated raltitrexed. In some embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is targeted and unpegylated (TLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha pentaglutamated raltitrexed. In some embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is non-targeted and unpegylated (NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha pentaglutamated raltitrexed. In some embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha pentaglutamated raltitrexed, or any range therein between. 
     In some embodiments, the liposome encapsulates alpha hexaglutamated raltitrexed (i.e., Lp-αPRTX, including PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha hexaglutamated raltitrexed. In some embodiments, the liposome interior space contains between 10 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome interior space contains between 10,000 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is unpegylated and has an interior space that contains less than 500,000 or 200,000 molecules of alpha hexaglutamated raltitrexed. In some embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is targeted and unpegylated (TLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha hexaglutamated raltitrexed. In some embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In some embodiments, the liposome is non-targeted and unpegylated (NTLp-αPRTX) and has an interior space that contains less than 500,000 or 200,000 molecules of alpha hexaglutamated raltitrexed. In some embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. In further embodiments, the liposome is non-targeted and unpegylated and the interior space of the liposome contains between 10,000 to 100,000 molecules of alpha hexaglutamated raltitrexed, or any range therein between. 
     In some embodiments, the disclosure provides a liposomal alpha polyglutamated raltitrexed composition wherein the liposome encapsulates alpha polyglutamated raltitrexed or a salt or acid thereof, and one or more aqueous pharmaceutically acceptable carriers. In some embodiments, the liposome interior space contains trehalose. In some embodiments, the liposome interior space contains 1% to 50% weight of trehalose. In some embodiments, the liposome interior space contains HBS at a concentration of between 1 to 200 mM and a pH of between 2 to 8. In some embodiments, liposome interior space has a pH 5-8, or any range therein between. In some embodiments, liposome interior space has a pH 6-7, or any range therein between. In some embodiments, the liposome interior space has a total concentration of sodium acetate and calcium acetate of between 50 mM to 500 mM, or any range therein between. 
     A Non-Polyglutamated Polyglutamatable Antifolates 
     In some embodiments, the liposome alpha polyglutamated raltitrexed (i.e., Lp-αPRTX, including PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) compositions comprise alpha polyglutamated raltitrexed e.g., an αPRTX disclosed herein) and one or more non-polyglutamated, polyglutamatable antifolate compositions. 
     In some embodiments, the Lp-αPRTX (e.g., PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) comprises alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) and raltitrexed (RTX). In some embodiments, the Lp-αPRTX (i.e., liposome alpha polyglutamated raltitrexed) comprises alpha polyglutamated raltitrexed and a polyglutamatable antifolate selected from the group consisting of: raltitrexed (RTX), methotrexate (MTX), pemetrexed (PMX), lometrexol (LMX), pralatrexate, AG2034, GW1843, aminopterin, and LY309887. In some embodiments, the Lp-αPRTX comprises alpha polyglutamated raltitrexed and lometrexol. In some embodiments, the Lp-αPRTX comprises alpha polyglutamated raltitrexed and pemetrexed. In some embodiments, the Lp-αPRTX comprises alpha polyglutamated raltitrexed and leucovorin. In some embodiments, the Lp-αPRTX comprises alpha polyglutamated raltitrexed and a triazine antifolate derivative (e.g., a sulphonyl fluoride triazine such as NSC 127755). In some embodiments, the Lp-αPRTX comprises alpha polyglutamated raltitrexed and a serine hydroxymethyltransferase (SHMT2) inhibitor. In some embodiments, the SHMT2 inhibitor is an antifolate (e.g., a polyglutamatable or nonpolyglutamatable antifolate). In some embodiments, the SHMT2 inhibitor is an antifolate. 
     B Non-Polyglutamatable Antifolates 
     In some embodiments, the Lp-αPRTX (e.g., PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) comprises an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) and a so-called “non-polyglutamatable” antifolate. In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed and a non-polyglutamatable antifolate that inhibits one or more enzymes in the folate cycle metabolic pathway. In further embodiments, the non-polyglutamatable antifolate inhibits one or more enzymes selected from: thymidylate synthase (TS), dihydrofolate reductase (DHFR), glycinamide ribonucleotide (GAR) transformylase, and aminoimidazole carboxamide ribonucleotide (AICAR) transformylase. In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed and a non-polyglutamatable antifolate that inhibits DHFR. In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed and a non-polyglutamatable antifolate that inhibits TS. In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed and a non-polyglutamatable antifolate that inhibits GAR or AICAR transformylase. In further embodiments, the non-polyglutamatable antifolate is selected from the group consisting of: trimetrexate (TMQ), piritrexim (BW301U), and talotrexin (PT523). In further embodiments, the non-polyglutamatable antifolate is selected from the group consisting of: nolatrexed (AG337), plevitrexed (ZD9331, BGC9331), and BGC 945 (ONX 0801). 
     C Platinums 
     In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed (Lp-αPRTX, such as e.g., PLp-αPRTX, TPLp-αPRTX, TLp-αPRTX, and NTLp-αPRTX) comprises an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) and a platinum-based chemotherapeutic agent or a salt or acid, thereof. In some embodiments, the liposome contains an alpha polyglutamated raltitrexed/platinum based agent complex (e.g., as described in Section IIC). 
     In some embodiments, the Lp-αPRTX comprises a platinum-based chemotherapeutic agent selected from the group consisting of: cisplatin, carboplatin, and oxaliplatin, or a salt or acid thereof. In other embodiments, the Lp-αPRTX comprises an analog of a platinum-based chemotherapeutic agent selected from the group consisting of: cisplatin, carboplatin, or oxaliplatin, or a salt or acid thereof. 
     In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and cisplatin or a salt or acid thereof. In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and a cisplatin analog, or a salt or acid thereof. 
     In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and carboplatin, or a salt or acid thereof. In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed and carboplatin analog, or a salt or acid thereof. 
     In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and oxaliplatin, or a salt or acid thereof. In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed and an oxaliplatin analog, or a salt or acid thereof. 
     In some embodiments, the liposome comprises an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) and a platinum-based chemotherapeutic agent selected from the group consisting of: nedaplatin, heptaplatin, and lobaplatin, nedaplatin, heptaplatin, and lobaplatin or a salt or acid thereof. In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and an analog of a platinum-based chemotherapeutic agent selected from the group consisting of: nedaplatin, heptaplatin, and lobaplatin, or a salt or acid thereof. 
     In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and a platinum-based chemotherapeutic agent selected from the group consisting of: stratoplatin, paraplatin, platinol, cycloplatin, dexormaplatin, spiroplatin, picoplatin, triplatin, tetraplatin, iproplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM-216, 254-S, NK 121, CI-973, DWA 2114R, NDDP, and dedaplatin, or a salt or acid thereof. In some embodiments, the Lp-αPRTX comprises an alpha polyglutamated raltitrexed and an analog of a platinum-based chemotherapeutic agent selected from the group consisting of: stratoplatin, paraplatin, platinol, cycloplatin, dexormaplatin, spiroplatin, picoplatin, triplatin, tetraplatin, iproplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM-216, 254-S, NK 121, CI-973, DWA 2114R, NDDP, and dedaplatin, or a salt or acid thereof. 
     In some embodiments, the liposome composition comprises liposomes that further contain one or more of an immunostimulatory agent, a detectable marker and a maleimide disposed on at least one of the PEG and the exterior of the liposome. 
     D Cyclodextrins 
     In additional embodiments, the αPRTX liposome comprise a αPRTX (e.g., a αPRTX disclosed herein) and a cyclodextrin (e.g., a cyclodextrin in Section IIC, herein). 
     In some embodiments, the αPRTX liposome comprises a complex formed by a cyclodextrin and a therapeutic agent. In some embodiments, the therapeutic agent is a cytotoxic compound or a salt or acid thereof. In a further embodiment, the therapeutic agent is a chemotherapeutic agent or a salt or acid thereof. In another embodiment, the therapeutic agent is a platinum-based drug. In another embodiment, the therapeutic agent is a taxane-based drug. In further embodiments, the therapeutic agent of the cyclodextrin/therapeutic agent complex is a member selected from the group consisting of: gemcitabine, a gemcitabine-based therapeutic agent, doxorubicin, an antifolate, an antifolate-based chemotherapeutic, or a salt or acid, acid or free base form thereof. In additional embodiments, the molar ratio of cyclodextrin/therapeutic agent in the complex is in the range 1-10:1. In some embodiments, the molar ratio of αPRTX/therapeutic agent in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of cyclodextrin/therapeutic agent in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. 
     In some embodiments, the αPRTX liposome comprises αPRTX and a cyclodextrin/platinum-based chemotherapeutic agent complex. In some embodiments, the platinum-based chemotherapeutic agent is selected from the group consisting of: cisplatin, carboplatin, and oxaliplatin, or a salt or acid thereof. In other embodiments, the cyclodextrin/platinum-based chemotherapeutic agent complex comprises an analog of a cisplatin, carboplatin, oxaliplatin, or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/platinum-based agent in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/platinum-based agent in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/platinum-based agent in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. 
     In some embodiments, the platinum-based chemotherapeutic agent is selected from the group consisting of: cisplatin, carboplatin, and oxaliplatin, or a salt or acid thereof. In other embodiments, the cyclodextrin/platinum-based chemotherapeutic agent complex comprises an analog of a cisplatin, carboplatin, oxaliplatin, or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/platinum-based agent in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/platinum-based agent in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/platinum-based chemotherapeutic agent in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. 
     In additional embodiments, the cyclodextrin/platinum-based agent complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In further embodiments, the disclosure provides a complex containing cyclodextrin and cisplatin or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/cisplatin (or cisplatin salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/cisplatin (or cisplatin salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/cisplatin (or cisplatin salt or acid) in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/cisplatin (or cisplatin salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In another embodiment, the disclosure provides a complex containing cyclodextrin and carboplatin or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/carboplatin (or carboplatin salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/carboplatin (or carboplatin salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/carboplatin (or carboplatin salt or acid) in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/carboplatin (or carboplatin salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In another embodiment, the disclosure provides a complex containing cyclodextrin and oxaliplatin, or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/oxaliplatin (or oxaliplatin salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/oxaliplatin (or oxaliplatin salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/oxaliplatin (or oxaliplatin salt or acid) in the complex is: 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/oxaliplatin (or oxaliplatin salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising cyclodextrin and a platinum-based chemotherapeutic agent selected from the group consisting of: nedaplatin, heptaplatin, lobaplatin, stratoplatin, paraplatin, platinol, cycloplatin, dexormaplatin, spiroplatin, picoplatin, triplatin, tetraplatin, iproplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM216, NK121, CI973, DWA 2114R, NDDP, and dedaplatin, or a salt or acid thereof. In other embodiments, the cyclodextrin/platinum-based chemotherapeutic agent complex comprises an analog of nedaplatin, heptaplatin, lobaplatin, stratoplatin, paraplatin, platinol, cycloplatin, dexormaplatin, spiroplatin, picoplatin, triplatin, tetraplatin, iproplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM216, NK121, CI973, DWA 2114R, NDDP, or dedaplatin, or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/oxaliplatin (or oxaliplatin salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/platinum-based chemotherapeutic agent (or salt or acid or analog thereof) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/platinum-based chemotherapeutic agent (or salt or acid or analog thereof) in the complex is: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/platinum-based chemotherapeutic agent (or salt or acid or analog thereof) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In some embodiments, the disclosure provides a composition comprising a cyclodextrin/taxane-based chemotherapeutic agent complex. In some embodiments, the taxane-based chemotherapeutic agent is selected from the group consisting of: paclitaxel (PTX), docetaxel (DTX), larotaxel (LTX), and cabazitaxel (CTX), or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/taxane-based agent in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/taxane-based agent in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/taxane-based agent in the complex is: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/taxane-based agent complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising cyclodextrin and paclitaxel (PTX), or a salt or acid thereof. In other embodiments, the cyclodextrin/taxane-based chemotherapeutic agent complex comprises an analog of paclitaxel (PTX), or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/paclitaxel (or paclitaxel salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/paclitaxel (or paclitaxel salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/paclitaxel (or paclitaxel salt or acid) in the complex is: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/paclitaxel (or paclitaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising cyclodextrin and docetaxel (DTX), or a salt or acid thereof. In other embodiments, the cyclodextrin/taxane-based chemotherapeutic agent complex comprises an analog of docetaxel (DTX), or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/docetaxel (or docetaxel salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/docetaxel (or docetaxel salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/docetaxel (or docetaxel salt or acid) in the complex is: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/docetaxel (or docetaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising cyclodextrin and larotaxel (LTX), or a salt or acid thereof. In other embodiments, the cyclodextrin/taxane-based chemotherapeutic agent complex comprises an analog of larotaxel (LTX), or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/larotaxel (or larotaxel salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/larotaxel (or larotaxel salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/larotaxel (or larotaxel salt or acid) in the complex is: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/larotaxel (or larotaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     In additional embodiments, the disclosure provides a complex comprising cyclodextrin and cabazitaxel (CTX), or a salt or acid thereof. In other embodiments, the cyclodextrin/taxane-based chemotherapeutic agent complex comprises an analog of cabazitaxel (CTX), or a salt or acid thereof. In some embodiments, the molar ratio of cyclodextrin/cabazitaxel (or cabazitaxel salt or acid) in the complex is in the range 1-10:1. In some embodiments, the molar ratio of cyclodextrin/cabazitaxel (or cabazitaxel salt or acid) in the complex is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:(21-50), or 1:&gt;50. In some embodiments, the molar ratio of αPRTX/cabazitaxel (or cabazitaxel salt or acid) in the complex is: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, (21-50):1, or &gt;50:1. In additional embodiments, the cyclodextrin/cabazitaxel (or cabazitaxel salt or acid) complex is encapsulated in a liposome (e.g., as described herein or otherwise known in the art). 
     The cyclodextrin of the cyclodextrin/therapeutic agent complex can be derivatized or underivatized. In some embodiments, the cyclodextrin is derivatized. In further embodiments, the cyclodextrin is a derivatized beta-cyclodextrin (e.g., a hydroxypropyl beta-cyclodextrin (HP-beta-CD), and a sulfobutyl ether beta-CD (SBE)-beta-cyclodextrin). In some embodiments, the cyclodextrin of the cyclodextrin/therapeutic agent complex is a derivatized beta-cyclodextrin comprising: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more 2-hydroxylpropyl-3- group substitutions of hydroxy groups; or 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more sulfoalkyl ether group substitutions of hydroxy groups. In further embodiments, the cyclodextrin of the cyclodextrin/therapeutic agent complex is a derivatized beta-cyclodextrin comprising: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more sulfobutyl ether group substitutions of hydroxy groups. 
     In some embodiments, the cyclodextrin of the cyclodextrin/therapeutic agent complex contained in the αPRTX liposome composition is a derivatized cyclodextrin of Formula I: 
     
       
         
         
             
             
         
       
     
     wherein: n is 4, 5, or 6; and wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9  are each, independently, —H, a straight chain or branched C 1 -C 8 -alkylene group, a 2-hydroxylpropyl-3- group; or an optionally substituted straight-chain or branched C 1 -C 6  group, wherein at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8  and R 9  is a straight-chain or branched C 1 -C 8 -alkylene group or a 2-hydroxylpropyl-3- group. 
     In some embodiments, the cyclodextrin of the cyclodextrin/therapeutic agent complex contained in the αPRTX liposome composition is a derivatized cyclodextrin of Formula II: 
     
       
         
         
             
             
         
       
     
     wherein: n is 4, 5, or 6; and wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9  are each, independently, —O— or a —O—(C 2 -C 6  alkylene)-SO 3   −  group; wherein at least one of R 1  and R 2  is independently a —O—(C 2 -C 6  alkylene)-SO 3   −  group; and S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 , S 8 , and S 9  are each, independently, a —H or a H or a pharmaceutically acceptable cation. In further embodiments, the wherein the pharmaceutically acceptable cation is selected from: an alkali metal such as Li + , Na + , or K + ; an alkaline earth metal such as Ca +2 , or Mg +2 , and ammonium ions and amine cations such as the cations of (C1-C6)-alkylamines, piperidine, pyrazine, (C1-C6)-alkanolamine and (C4-C8)-cycloalkanolamine. 
     In some embodiments, the αPRTX liposome comprises between 100 to 100,000 of the cyclodextrin/therapeutic agent complexes. 
     In some embodiments, a cyclodextrin derivative of the αPRTX/cyclodextrin complex and/or cyclodextrin/therapeutic agent complex is a cyclodextrin disclosed in U.S. Pat. Nos. 6,133,248, 5,874,418, 6,046,177, 5,376,645, 5,134,127, 7,034,013, 6,869,939; and Intl. Appl. Publ. No. WO 02005/117911, the contents each of which is herein incorporated by reference in its priority. 
     In some embodiments, the cyclodextrin derivative of the cyclodextrin/therapeutic agent complex is a sulfoalkyl ether cyclodextrin. In some embodiments, the cyclodextrin derivative of complex is a sulfobutyl ether-3-cyclodextrin such as CAPTISOL® (CyDex Pharma. Inc., Lenexa, Kans. Methods for preparing sulfobutyl ether-3-cyclodextrin and other sulfoalkyl ether cyclodextrins are known in the art. 
     In some embodiments, the cyclodextrin derivative of the cyclodextrin/therapeutic agent complex is a compound of Formula III: 
     
       
         
         
             
             
         
       
     
     wherein R equals:
         (e) (H) 21-X  or (—(CH 2 ) 4 —SO 3 Na)x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0;   (f) (H) 21-X  or (—(CH 2 CH(OH)CH 3 )x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0;   (g) (H) 21-X  or (sulfoalkyl ethers)x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0; or   (h) (H) 21-X  or (—(CH 2 ) 4 —SO 3 Na)x, and x=1.0-10.0, 1.0-5.0, 6.0-7.0, or 8.0-10.0.       

     Additional cyclodextrins and cyclodextrin/platinum-based therapeutic complexes that can be contained in the αPRTX liposomes and used according to the disclosed methods is disclosed in U.S. Appl. No. 62/583,432, the contents of which is herein incorporated by reference it its entirety. 
     In some embodiments, the αPRTX liposome comprises a complex of a cyclodextrin and a platinum-based chemotherapeutic agent, or a salt thereof. In some embodiments, the platinum-based chemotherapeutic agent is cisplatin or a cisplatin analog. In some embodiments, the platinum-based chemotherapeutic agent is carboplatin. In additional embodiments, the liposome composition comprises a platinum-based chemotherapeutic agent is a member selected from the group consisting of: carboplatin, cisplatin, oxaliplatin, satraplatin, picoplatin, nedaplatin, triplatin, tetraplatin, lipoplatin, lobaplatin, ormaplatin, zeniplatin, platinum-triamine, traplatin, enloplatin, JM-216, 254-S, NK 121, CI-973, DWA 2114R, NDDP, and dedaplatin. In some embodiments, the αPRTX liposome comprises between 100 to 100,000 platinum-based chemotherapeutic agent/CD complexes. In additional embodiments, the liposome composition comprises liposomes that have a diameter in the range of 20 nm to 500 nm, or 20 nm to 200 nm, or any range therein between. In some embodiments, liposomes in the composition comprise between 100 to 100,000 platinum. 
     (3) Targeted Liposomes 
     In some embodiments, the disclosure provides a liposomal alpha polyglutamated raltitrexed composition wherein the liposome comprises an alpha polyglutamated raltitrexed and a targeting moiety attached to one or both of a PEG and the exterior of the liposome, and wherein the targeting moiety has a specific affinity for a surface antigen on a target cell of interest. Such liposomes may generally be referred to herein as “targeted liposomes,” e.g., liposomes including one or more targeting moieties or biodistribution modifiers on the surface of, or otherwise attached to, the liposomes. The targeting moiety of the targeted liposomes can be any moiety or agent that is capable of specifically binding a desired target (e.g., an antigen target expressed on the surface of a target cell of interest). In one embodiment, the targeted liposome specifically and preferentially binds to a target on the surface of a target cell of interest that internalizes the targeted liposome into which the liposome encapsulated alpha polyglutamated raltitrexed (e.g., alpha pentaglutamated RTX or alpha hexaglutamated RTX) exerts its cytotoxic effect. In further embodiments, the target cell is a cancer cell, a tumor cell or a metastatic cell. In some embodiments, the targeted liposome is pegylated. 
     The term “attach” or “attached” refers, for example, to any type of bonding such as covalent bonding, ionic bonding (e.g., avidin-biotin) bonding by hydrophobic interactions, and bonding via functional groups such as maleimide, or linkers such as PEG. For example, a detectable marker, a steric stabilizer, a liposome, a liposomal component, an immunostimulating agent may be attached to each other directly, by a maleimide functional group, or by a PEG-malemide group. 
     The composition and origination of the targeting moiety is non-limiting to the scope of this disclosure. In some embodiments, the targeting moiety attached to the liposome is a polypeptide or peptidomimetic ligand. Peptide and peptidomimetic targeting moieties include those having naturally occurring or modified peptides, e.g., D or L peptides; alpha, beta, or gamma peptides; N-methyl peptides; azapeptides; peptides having one or more amide, i.e., peptide, linkages replaced with one or more urea, thiourea, carbamate, or sulfonyl urea linkages; or cyclic peptides. A peptidomimetic is a molecule capable of folding into a defined three-dimensional structure similar to a natural peptide. In some embodiments, the peptide or peptidomimetic targeting moiety is 2-50 amino acids long, e.g., about 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 amino acids long 
     In some embodiments, the targeting moiety polypeptide is at least 40 amino acid residues in length. In other embodiments, the targeting moiety polypeptide is at least 50, 60, 75, 100, 125, 150, 175, 200, 250, or 300 amino acid residues in length. 
     In additional embodiments, the targeting moiety polypeptide such as an antibody or an antigen-binding antibody fragment that binds a target antigen with an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  as determined using BIACORE® analysis. 
     In some embodiments, the targeting moiety is an antibody or an antibody derivative. In other embodiments, the binding domain of the targeting moiety polypeptide is not derived from the antigen binding domain of an antibody. In some embodiments, the targeting moiety is a polypeptide derived from a binding scaffold selected from the group consisting of a DARPin, affilin, and armadillo repeat, D domain (see, e.g., WO 2016/164308), Z-domain (Affibody), adnectin, lipocalin, affilin, anticalin, knottin, fynomer, atrimer, kunitz domain (see, e.g., WO 2004/063337), CTLA4, or avimer (see, e.g., U.S. Publ. Nos. 2004/0175756, 2005/0053973, 2005/0048512, and 2006/0008844). 
     In additional embodiments, the targeting moiety is an antibody or a derivative of the antigen binding domain of an antibody that has specific affinity for an epitope on a cell surface antigen of interest expressed on the surface of a target cell. In some embodiments, the targeting moiety is a full-length antibody. In some embodiments, the targeting moiety is an antigen binding portion of an antibody. In some embodiments, the targeting moiety is an scFv. In other embodiments, the targeting moiety is a Fab. In some embodiments, the targeting moiety comprises a binding domain derived from the antigen binding domain of an antibody (e.g., an scFv, Fab, Fab′, F(ab′)2, an Fv fragment, a disulfide-linked Fv (sdFv), a Fd fragment consisting of VH and CH1 domains, an scFv, a minibody, a BiTE, a Tandab, a diabody ((VL-VH) 2  or (VH-VL) 2 ), a single domain antibody (e.g., an sdAb such as a nanobody (either VL or VH)), and a camelid VHH domain). In some embodiments, the targeting moiety comprises one or more complementarity determining regions (CDRs) of antibody origin. Examples of suitable antibody-based targeting moieties for the disclosed targeted liposomes include a full-length human antibody, a humanized antibody, a chimeric antibody, an antigen binding fragment of an antibody, a single chain antibody, a single-domain antibody, a bi-specific antibody, a synthetic antibody, a pegylated antibody and a multimeric antibody. The antibody of the provided targeted liposomes can have a combination of the above characteristics. For example, a humanized antibody can be an antigen binding fragment and can be pegylated and multimerized as well. 
     The term “humanized antibody” refers to forms of non-human (e.g., murine) antibodies that are specific immunoglobulin chains, chimeric immunoglobulins, or fragments thereof that contain minimal non-human (e.g., murine) sequences. Typically, humanized antibodies are human immunoglobulins in which residues from the complementary determining region (CDR) are replaced by residues from the CDR of a non-human species (e.g., mouse, rat, rabbit, and hamster) that have the desired specificity, affinity, and capability (Jones et al., Nature 321:522-525 (1986); Riechmann et al., Nature 332:323-327 (1988); Verhoeyen et al., Science 239:1534-1536 (1988)). In some instances, the Fv framework region (FR) residues of a human immunoglobulin are replaced with the corresponding residues in an antibody from a non-human species that has the desired specificity, affinity, and capability. The humanized antibody can be further modified by the substitution of additional residues either in the Fv framework region and/or within the replaced non-human residues to refine and optimize antibody specificity, affinity, and/or capability. In general, the humanized antibody will comprise substantially all of at least one, and typically two or three, variable domains containing all or substantially all of the CDR regions that correspond to the non-human immunoglobulin whereas all or substantially all of the FR regions are those of a human immunoglobulin consensus sequence. The humanized antibody can also comprise at least a portion of an immunoglobulin constant region or domain (Fc), typically that of a human immunoglobulin. Examples of methods used to generate humanized antibodies are described in U.S. Pat. Nos. 5,225,539 and 5,639,641. 
     In further embodiments, the targeting moiety has specific affinity for an epitope on a surface antigen of a target cell of interest. In some embodiments, the target cell is a cancer cell. In some embodiments, the target cell is a tumor cell. In other embodiments, the target cell is an immune cell. 
     In some embodiments, the targeting moiety has specific affinity for an epitope expressed on a tumor cell surface antigen. The term “tumor cell surface antigen” refers to an antigen that is common to a specific hyperproliferative disorder such as cancer. In some embodiments, the targeting moiety has specific affinity for an epitope of a tumor cell surface antigen that is a tumor associated antigen (TAA). A TAA is an antigen that is found on both tumor and some normal cells. A TAA may be expressed on normal cells during fetal development when the immune system is immature and unable to respond or may be normally present at extremely low levels on normal cells but which are expressed at much higher levels on tumor cells. Because of the dynamic nature of tumors, in some instances, tumor cells may express unique antigens at certain stages, and at others also express antigens that are also expressed on non-tumor cells. Thus, inclusion of a certain marker as a TAA does not preclude it being considered a tumor specific antigen. In some embodiments, the targeting moiety has specific affinity for an epitope of a tumor cell surface antigen that is a tumor specific antigen (TSA). A TSA is an antigen that is unique to tumor cells and does not occur on other cells in the body. In some embodiments, the targeting moiety has specific affinity for an epitope of a tumor cell surface antigen expressed on the surface of a cancer including but not limited to primary or metastatic melanoma, thymoma, lymphoma, sarcoma, lung cancer (e.g., NSCLC or SCLC), liver cancer, non-Hodgkin&#39;s lymphoma, Hodgkin&#39;s lymphoma, leukemias, multiple myeloma, glioblastoma, neuroblastoma, uterine cancer, cervical cancer, renal cancer, thyroid cancer, bladder cancer, kidney cancer, mesothelioma, and adenocarcinomas such as breast cancer, prostate cancer, ovarian cancer, pancreatic cancer, colon cancer and other cancers known in the art. In some embodiments, the targeting moiety has specific affinity for an epitope of a cell surface antigen expressed on the surface of a cell in the tumor microenvironment (e.g., and antigen such as VEGFR and TIE1, or TIE2 expressed on endothelial cells and macrophage, respectively, or an antigen expressed on tumor stromal cells such as cancer-associated fibroblasts (CAFs) tumor infiltrating T cells and other leukocytes, and myeloid cells including mast cells, eosinophils, and tumor-associated macrophages (TAM). 
     In some embodiments, the targeted liposome αPRTX composition (e.g., TLp-αPRTX or TPLp-αPRTX) comprises a targeting moiety that has specific affinity for an epitope of a cancer or tumor cell surface antigen that is preferentially/differentially expressed on a target cell such as a cancer cell or tumor cell, compared to normal or non-tumor cells, that is present on a tumor cell but absent or inaccessible on a non-tumor cell. For example, in some situations, the tumor antigen is on the surface of both normal cells and malignant cancer cells but the tumor epitope is only exposed in a cancer cell. As a further example, a tumor cell surface antigen may experience a confirmation change in a cancerous state that causes a cancer cell specific epitope to be present. A targeting moiety with specific affinity to an epitope on a targetable tumor cell surface antigen described herein or otherwise known in the art is useful and is encompassed by the disclosed compositions and methods. In some embodiments, the tumor cell with the tumor cell surface antigen is a cancer cell. Examples of such tumor cell surface antigens include, without limitation folate receptor alpha, folate receptor beta and folate receptor delta. 
     In further embodiments, the targeting moiety comprises a polypeptide targeting moiety such as an antibody or an antigen-binding antibody fragment and the targeting moiety has binding specificity for a folate receptor. In some embodiments, the targeting moiety binds a folate receptor with an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  as determined using BIACORE® analysis. In some embodiments, the folate receptor bound by the targeting moiety is one or more folate receptors selected from the group consisting of: folate receptor alpha (FR-α), folate receptor beta (FR-β), and folate receptor delta (FR-δ). In a further embodiment, the targeting moiety has specific affinity for at least two antigens selected from the group consisting of folate receptor alpha, folate receptor beta, and folate receptor delta. In another embodiment, the targeting moiety has specific affinity for folate receptor alpha; folate receptor beta; and folate receptor delta. 
     In some embodiments, the targeting moiety has a specific affinity for an epitope of a cell surface antigen that internalizes the targeting moiety upon binding. Numerous cell surface antigens that internalize binding partners such as antibodies upon binding are known in the art and are envisioned to be binding targets for the targeting moieties expressed on the targeted liposome αPRTX compositions (e.g., TLp-αPRTX or TPLp-αPRTX) disclosed herein. 
     In some embodiments, the targeting moiety has a specific affinity for an epitope of a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. 
     In some embodiments, the targeting moiety has a specific affinity for a cell surface antigen(s) derived, from or determined to be expressed on, a specific subject&#39;s cancer (e.g., tumor) such as a neoantigen. 
     In some embodiments, the targeting moiety has a specific affinity for an epitope of a cell surface antigen selected from the group consisting of mannose-6-phosphate receptor, transferrin receptor, and a cell adhesion molecule (CAM). In further embodiments, the targeting moiety has a specific affinity for an epitope of a CAM is selected from the group consist of: intercellular adhesion molecule (ICAM), platelet-endothelial cell adhesion molecule (PECAM), activated leukocyte cell adhesion molecule (ALCAM), B-lymphocyte cell adhesion molecule (BL-CAM), vascular cell adhesion molecule (VCAM), mucosal vascular addressin cell adhesion molecule (MAdCAM), CD44, LFA-2, LFA-3, and basigin. 
     A discussed herein, folate receptors (FRs) are distinct from reduced folate carriers (RFCs) and exploit different pathways for bringing folates and antifolates into cells. In some embodiments, the targeting moiety specifically binds a folate receptor. In further embodiments, the targeting moiety specifically binds a folate receptor selected from folate receptor alpha, folate receptor beta and folate receptor delta. Antibodies to folate receptor alpha can routinely be generated using techniques known in the art. Moreover, the sequences of numerous anti-folate receptor antibodies are in the public domain and/or commercially available and are readily obtainable. 
     Murine antibodies against folate receptor are examples of antibodies that can be used as targeting moieties of the disclosed targeted liposome is a murine antibody against folate receptor. The sequence of these antibodies are known and are described, for example, in U.S. Pat. Nos. 5,646,253; 8,388,972; 8,871,206; and 9,133,275, and Intl. Appl. Nos. PCT/US2011/056966, and PCT/US2012/046672. For example, based on the sequences already in the public domain, the gene for the antibodies can be synthesized and placed into a transient expression vector and the antibody was produced in HEK-293 transient expression system. The antibody can be a complete antibody, a Fab, or any of the various antibody variations discussed herein or otherwise known in the art. 
     In some embodiments, the targeted liposome (e.g., TL-αPRTX or TPL-αPRTX) contains from 1 to 1,000, or more than 1,000, targeting moieties on its surface. In some embodiments, the targeted liposome contains from 30 to 1,000, 30 to 500, 30 to 250 or 30-200, targeting moieties, or any range therein between. In some embodiments, the targeted liposome contains less than 220 targeting moieties, less than 200 targeting moieties, or less than 175 targeting moieties. In some embodiments, the targeting moiety is non-covalently bonded to the outside of the liposome (e.g., via ionic interaction or a GPI anchor). 
     In some embodiments, the molecules on the outside of the targeted liposome (e.g., TL-αPRTX or TPL-αPRTX) include a lipid, a targeting moiety, a steric stabilizer (e.g., a PEG), a maleimide, and a cholesterol. In some embodiments, the targeting moiety is covalently bound via a maleimide functional group. In some embodiments, the targeting moiety is covalently bound to a liposomal component or a steric stabilizer such as a PEG molecule. In some embodiments, all the targeting moieties of the liposome are bound to one component of the liposome such as a PEG. In other embodiments, the targeting moieties of the targeted liposome are bound to different components of the liposome. For example, some targeting moieties may be bound to the lipid components or cholesterol, some targeting moieties may be bound to the steric stabilizer (e.g., PEG) and still other targeting moieties may be bound to a detectable marker or to another targeting moiety. In some embodiments, the outside of the targeted liposome (e.g., TL-αPRTX or TPL-αPRTX) further comprises one or more of an immunostimulatory agent, a detectable marker and a maleimide disposed on at least one of the PEG and the exterior of the liposome. 
     In some embodiments, the targeted liposome (e.g., TL-αPRTX or TPL-αPRTX) is anionic or neutral. In some embodiments, the targeted anionic or neutral liposome has a diameter in the range of 20 nm to 500 nm or 20 nm to 200 nm, or any range therein between. In further embodiments, the targeted anionic or neutral liposome has a diameter in the range of 80 nm to 120 nm, or any range therein between. 
     In other embodiments, the targeted liposome (e.g., TL-αPRTX or TPL-αPRTX) is cationic. In some embodiments, the targeted anionic or neutral liposome has a diameter in the range of 20 nm to 500 nm or 20 nm to 200 nm, or any range therein between. In further embodiments, the targeted anionic or neutral liposome has a diameter in the range of 80 nm to 120 nm, or any range therein between. 
     In some embodiments, the targeted liposomes comprise at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha polyglutamated RTX. In some embodiments, during the process of preparing the targeted liposomes, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the targeted liposomes. 
     In some embodiments, the targeted liposomal compositions comprise 30-70%, 30-60%, or 30-50%, w/w of the alpha tetraglutamated RTX, or any range therein between In some embodiments, the targeted liposomes comprise at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha tetraglutamated RTX. In some embodiments, during the process of preparing the targeted liposomes, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha tetraglutamated RTX is encapsulated (entrapped) in the targeted liposomes. 
     In some embodiments, the targeted liposomal compositions comprise 30-70%, 30-60%, or 30-50%, w/w of the alpha pentaglutamated RTX, or any range therein between In some embodiments, the targeted liposomes comprise at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha pentaglutamated RTX. In some embodiments, during the process of preparing the targeted liposomes, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha pentaglutamated RTX is encapsulated (entrapped) in the targeted liposomes. 
     In some embodiments, the targeted liposomal compositions comprise 30-70%, 30-60%, or 30-50%, w/w of the alpha hexaglutamated RTX, or any range therein between In some embodiments, the targeted liposomes comprise at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, w/w of the alpha hexaglutamated RTX. In some embodiments, during the process of preparing the targeted liposomes, at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha hexaglutamated RTX is encapsulated (entrapped) in the targeted liposomes. 
     Methods and techniques for covalently associating polypeptide targeting moieties with a liposome surface molecule are known in the art and can readily be applied to prepare the TL-αPRTX or TPL-αPRTX liposome compositions. 
     Chemical binding of non-proteinaceous targeting moieties and other compositions to the liposomal surface may be employed. Thus, a non-proteinaceous moiety, may be covalently or non-covalently linked to, embedded or adsorbed onto the liposome using any linking or binding method and/or any suitable chemical linker known in the art. The exact type and chemical nature of such cross-linkers and cross linking methods is preferably adapted to the type of affinity group used and the nature of the liposome. Methods for binding or adsorbing or linking the targeting moiety are also well known in the art. For example, in some embodiments, the targeting moiety may be attached to a group at the interface via, but not limited to, polar groups such as amino, SH, hydroxyl, aldehyde, formyl, carboxyl, His-tag or other polypeptides. In addition, the targeting moiety may be attached via, but not limited to, active groups such as succinimidyl succinate, cyanuric chloride, tosyl activated groups, imidazole groups, CNBr, NHS, Activated CH, ECH, EAH, Epoxy, Thiopropyl, Activated Thiol, etc., Moreover, the targeting moiety may be attached via, but not limited to, hydrophobic bonds (Van Der Waals) or electrostatic interactions that may or may not include cross-linking agents (e.g., bivalent anions, poly-anions, poly-cations etc.). 
     (4) Manufacture of Liposomes 
     In some embodiments, the disclosure provides a method of making a liposomal composition disclosed herein. In one embodiment, the method includes forming a mixture comprising: (1) a liposomal component; and (2) an alpha polyglutamated (e.g., pentaglutamated or hexaglutamated) raltitrexed in aqueous solution. In further embodiments, the mixture comprises a pegylated liposomal component. The mixture is then homogenized to form liposomes in the aqueous solution. Further, the mixture can be extruded through a membrane to form liposomes enclosing the alpha polyglutamated raltitrexed in an aqueous solution. It is understood the liposomal components of this disclosure can comprise any lipid (including cholesterol) including functionalized lipids and lipids attached to targeting moieties, detectable labels, and steric stabilizers, or any subset of all of these. It is further noted that the bioactive alpha polyglutamated raltitrexed in aqueous solution can comprise any reagents and chemicals discussed herein or otherwise known in the art for the interior or exterior of the liposome including, for example, buffers, salts, and cryoprotectants. 
     In some embodiments, the disclosure provides a method of making a targeted pegylated liposomal alpha polyglutamated raltitrexed (targeted-PLp-αPRTX) or non-targeted PLp-αPRTX disclosed herein. In one embodiment, the method includes forming a mixture comprising: (1) a liposomal component; (2) an alpha polyglutamated (e.g., pentaglutamated or hexaglutamated) raltitrexed in aqueous solution; and (3) the targeting moiety. The mixture is then homogenized to form liposomes in the aqueous solution. Further, the mixture may be extruded through a membrane to form liposomes enclosing the targeted alpha polyglutamated raltitrexed in an aqueous solution. It is understood that the targeted pegylated liposomal components can comprise any lipid (including cholesterol) including functionalized lipids and lipids attached to targeting moieties, detectable labels, and steric stabilizers, or any subset of all of these. It is further noted that the targeted pegylated liposome can comprise any reagents and chemicals discussed herein or otherwise known in the art for the interior or exterior of the liposome including, for example, buffers, salts, and cryoprotectants. 
     The above methods optionally further comprise the step of lyophilizing the composition after the removing step to form a lyophilized composition. As stated above, targeted-PTPLA or non-targeted-PTPLA in aqueous solution may comprise a cryoprotectant described herein or otherwise known in the art. If the composition is to be lyophilized, a cryoprotectant may be preferred. 
     Additionally, after the lyophilizing step, the method optionally further comprises the step of reconstituting the lyophilized composition by dissolving the composition in a solvent after the lyophilizing step. Methods of reconstitution are known in the art. One preferred solvent is water. Other preferred solvents include saline solutions and buffered solutions. 
     While certain exemplary embodiments, are discussed herein, it is understood that liposomes can be made by any method that is known in the art. See, for example, G. Gregoriadis (editor), Liposome Technology, vol. 1-3, 1st edition, 1983; 2nd edition, 1993, CRC Press, 45 Boca Raton, Fla. Examples of methods suitable for making liposome compositions include extrusion, reverse phase evaporation, sonication, solvent (e.g., ethanol) injection, microfluidization, detergent dialysis, ether injection, and dehydration/rehydration. The size of liposomes can routinely be controlled by controlling the pore size of membranes used for low pressure extrusions or the pressure and number of passes utilized in microfluidization or any other suitable methods known in the art. 
     In general, the alpha polyglutamated raltitrexed is contained inside, that is, in the inner (interior) space of the liposomes. In one embodiment, substituted ammonium is partially or substantially completely removed from the outer medium surrounding the liposomes. Such removal can be accomplished by any suitable means known in the art (e.g., dilution, ion exchange chromatography, size exclusion chromatography, dialysis, ultrafiltration, and precipitation). Accordingly, the methods of making liposomal compositions set forth above or otherwise known in the art can optionally further comprise the step of removing alpha polyglutamated raltitrexed in aqueous solution outside of the liposomes after forming the liposomes, for example, by the homogenization or by the the extruding step. 
     In other embodiments, the disclosure provides a targeted pegylated liposomal alpha polyglutamated raltitrexed (PLp-αPRTX) that selectively targets folate receptors comprising: a liposome including an interior space, an alpha polyglutamated raltitrexed disposed within the interior space, a steric stabilizer molecule attached to an exterior of the liposome, and a targeting moiety comprising a protein with specific affinity for at least one folate receptor, said targeting moiety attached to at least one of the steric stabilizer and the exterior of the liposome. The components of this embodiment, may be the same as described for other embodiments, of this disclosure. For example, the targeted pegylated liposomal alpha polyglutamated raltitrexed and the steric stabilizer which may be PEG, are as described in other parts of this disclosure. 
     In some embodiments, the disclosure provides a method of preparing a targeted composition comprising a pegylated liposome including an entrapped and/or encapsulated alpha polyglutamated raltitrexed; a targeting moiety an amino acid chain, the amino acid chain comprising a plurality of amino acids, the targeting moiety having a specific affinity for at least one type of folate receptor, the specific affinity being defined to include an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  moles [0.05 nM to 10 μM] for at least one type folate receptor, the targeting moiety attached to one or both of a PEG and an exterior of the liposome, the method comprising: forming a mixture comprising: liposomal components and alpha polyglutamated raltitrexed in solution; homogenizing the mixture to form liposomes in the solution; processing the mixture to form liposomes entrapping and/or encapsulating alpha polyglutamated raltitrexed; and providing a targeting moiety on a surface of the liposomes entrapping and/or encapsulating the alpha polyglutamated raltitrexed, the targeting moiety having specific affinity for at least one of folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-δ). In some embodiments, the method comprising: forming a mixture comprising: liposomal components and alpha polyglutamated raltitrexed in solution; forming liposomes entrapping and/or encapsulating alpha polyglutamated raltitrexed, for example by homogenizing or otherwise processing the mixture to form liposomes; and providing a targeting moiety on a surface of the liposomes entrapping and/or encapsulating the alpha polyglutamated raltitrexed, the targeting moiety having specific affinity for at least one of folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-δ). In some embodiments, the processing includes one or more of: thin film hydration, extrusion, in-line mixing, ethanol injection technique, freezing-and-thawing technique, reverse-phase evaporation, dynamic high pressure microfluidization, microfluidic mixing, double emulsion, freeze-dried double emulsion, 3D printing, membrane contactor method, and stirring, and once the particles have been formed, the particles can have their sizes further modified by one or more of extrusion and sonication. In some embodiments, during the process of preparing the liposomes at least 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or more than 75%, of the starting material of alpha polyglutamated RTX is encapsulated (entrapped) in the targeted liposomes. In some embodiments, the liposomes are anionic or neutral. In some embodiments, the targeting moiety has the specific affinity for one or more of: folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-δ). In further embodiments, the targeting moiety has the specific affinity for folate receptor alpha (FR-α) and folate receptor beta (FR-β). In additional embodiments, the targeting moiety has the specific affinity for an epitope on a tumor cell surface antigen that is present on a tumor cell but absent or inaccessible on a non-tumor cell. 
     Liposomes can also be prepared to target particular cells, organs, or cell organelles by varying phospholipid composition or by inserting receptors or counter-receptors into the liposomes. For example, liposomes, prepared with a high content of a nonionic surfactant, have been used to target the liver. (See, e.g., Japanese Patent 04-244,018 to Hayakawa et al.; Kato et al., Biol. Pharm. Bull. 16:960, (1993.)) A liposomal formulation of dipalmitoylphosphatidylcholine (DPPC) with a soybean-derived sterylglucoside mixture (SG) and cholesterol (Ch) has also been shown to target the liver. (See Shimizu et al., Biol. Pharm. Bull. 20:881, 1997.) 
     B. Antibody Delivery Vehicles 
     In additional embodiments, the disclosure provides an antibody delivery vehicle (e.g., ADC). In some embodiments, the disclosure provides an immunoconjugate having the formula (A)-(L)-(αPRTX), wherein: (A) is an antibody or antigen binding fragment of an antibody; (L) is a linker; and (αPRTX) is a αPRTX composition described herein; and wherein said linker (L) links (A) to (αPRTX). 
     In some embodiments, the antibody or antigen binding antibody fragment has specific affinity for an epitope of a cell surface antigen on a cell of interest (e.g., an epitope and/or antigen described herein). In certain embodiments, the antibody binds to an antigen target that is expressed in or on the cell membrane (e.g., on the cell surface) of a cancer/tumor and the antibody is internalized by the cell after binding to the (antigen) target, after which the αPRTX is released intracellularly. In some embodiments, the antibody is a full length antibody. 
     The antibody or antigen binding antibody fragment of the (A)-(L)-(αPRTX) immunoconjugate can be an IgA, IgD, IgE, IgG or IgM antibody. The different classes of immunoglobulins have different and well known subunit structures and three-dimensional configurations. In certain embodiments, the antibody is an IgG antibody. In some embodiments, the antibody is an IgG1, IgG2, IgG3 or IgG4 antibody. In certain embodiments, the antibody is an IgG1 antibody. 
     In some embodiments, (A) is an antigen binding fragment of an antibody. In some embodiments, (A) is an antigen binding fragment of an antibody. 
     A “linker” is any chemical moiety that is capable of linking a compound, usually a drug, such as a αPRTX, to an antibody or antigen binding fragment of an antibody in a stable, covalent manner. The linkers can be susceptible to or be substantially resistant to acid-induced cleavage, light-induced cleavage, peptidase-induced cleavage, esterase-induced cleavage, and disulfide bond cleavage, at conditions under which the compound or the antibody remains active. Suitable linkers are known in the art and include, for example, disulfide groups, thioether groups, acid labile groups, photolabile groups, peptidase labile groups and esterase labile groups. Linkers also include charged linkers, and hydrophilic forms thereof. 
     In some embodiments, the linker is selected from the group consisting of a cleavable linker, a non-cleavable linker, a hydrophilic linker, and a dicarboxylic acid based linker. In another embodiment, the linker is a non-cleavable linker. In another embodiment, the linker is selected from the group consisting: N-succinimidyl 4-(2-pyridyldithio) pentanoate (SPP); N-succinimidyl 4-(2-pyridyldithio)butanoate (SPDB) or N-succinimidyl 4-(2-pyridyldithio)-2-sulfobutanoate (sulfo-SPDB); N-succinimidyl 4-(maleimidomethyl) cyclohexane-carboxylate (SMCC); N-sulfosuccinimidyl 4-(maleimidomethyl)cyclohex-anecarboxylate (sulfoSMCC); N-succinimidyl-4-(iodoacetyl)-aminobenzoate (SIAB); and N-succinimidyl-[(N-maleimidopropionamido)-tetraethyleneglycol]ester (NHS-PEG4-ma-leimide). In a further embodiment, the linker is N-succinimidyl-[(N-maleimido-propionamido)-tetraethyleneglycol]ester (NHS-PEG4-maleimide). 
     In some embodiments, the α polyglutamated RTX is attached (coupled) to the antibody or antigen binding antibody fragment of the immunoconjugate directly, or through a linker using techniques known in the art. Such attachment of one or more αPRTX can include many chemical mechanisms, such as covalent binding, affinity binding, intercalation, coordinate binding and complexation. Covalent binding of the αPRTX and antibody or antigen binding antibody fragment can be achieved by direct condensation of existing side chains or by the incorporation of external bridging molecules. Many bivalent or polyvalent agents are useful in associating polypeptides to other proteins with coupling agents such as carbodiimides, diisocyanates, glutaraldehyde, diazobenzenes, and hexamethylene diamines. This list is not intended to be exhaustive of the various coupling agents known in the art but, rather, is exemplary of the more common coupling agents. In some embodiments, the antibody or antigen binding antibody fragment is derivatized and then attached to the a polyglutamated RTX. Alternatively, the αPRTX can be derivatized and attached to the antibody or antigen binding antibody fragment using techniques known in the art. 
     In some embodiments, the immunoconjugate comprises an antibody or an antigen-binding fragment of an antibody and αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups (including the glutamyl group in raltitrexed). In some embodiments, the immunoconjugate comprises alpha polyglutamated raltitrexed that comprises two or more glutamyl groups in the L-form. In other embodiments, the immunoconjugate comprises alpha polyglutamated raltitrexed that comprises a glutamyl group in the D-form. In further embodiments, the immunoconjugate comprises alpha polyglutamated raltitrexed that comprises a glutamyl group in the D-form and two or more glutamyl groups in the L-form. In additional embodiments, the immunoconjugate comprises alpha polyglutamated raltitrexed that comprises two or more glutamyl groups that have a gamma carboxyl linkage. In some embodiments, the immunoconjugate comprises α pentaglutamated RTX. In further embodiments, the immunoconjugate comprises L-α pentaglutamated RTX, a D-α pentaglutamated RTX, or an L- and D-α pentaglutamated RTX. In some embodiments, the immunoconjugate comprises a α hexaglutamated RTX (Lp-αPRTX). In further embodiments, the immunoconjugate comprises an L-α hexaglutamated RTX, a D-α hexaglutamated RTX, or an L- and D-α hexaglutamated RTX. 
     In some embodiments, the antibody delivery vehicle composition comprises an alpha polyglutamated raltitrexed and an antibody or an antigen binding antibody fragment that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. 
     In some embodiments, the antibody delivery vehicle composition comprises an alpha polyglutamated raltitrexed and an antibody or an antigen binding antibody fragment that has specific affinity for an epitope on an antigen selected from the group consisting of mannose-6-phosphate receptor, transferrin receptor, and a cell adhesion molecule (CAM). In further embodiments, the targeting moiety has a specific affinity for an epitope of a CAM is selected from the group consist of: intercellular adhesion molecule (ICAM), platelet-endothelial cell adhesion molecule (PECAM), activated leukocyte cell adhesion molecule (ALCAM), B-lymphocyte cell adhesion molecule (BL-CAM), vascular cell adhesion molecule (VCAM), mucosal vascular addressin cell adhesion molecule (MAdCAM), CD44, LFA-2, LFA-3, and basigin 
     In some embodiments, the antibody delivery vehicle composition comprises 1, 2, 3, 4, 5, 5-10, or greater than 10 α polyglutamated RTX. In some embodiments, the antibody delivery vehicle composition comprises 1, 2, 3, 4, 5, 5-10, or greater than 10, α pentaglutamated RTX. In some embodiments, the antibody delivery vehicle composition comprises 1, 2, 3, 4, 5, 5-10, or greater than 10, α hexaglutamated RTX. 
     IV. Pharmaceutical Compositions and Administration 
     In some embodiments, the liposome composition is provided as a pharmaceutical composition containing the liposome and a carrier, e.g., a pharmaceutically acceptable carrier. Examples of pharmaceutically acceptable carriers contained in the provided pharmaceutical compositions include normal saline, isotonic dextrose, isotonic sucrose, Ringer&#39;s solution, and Hanks&#39; solution. In some embodiments, a buffer substance is added to maintain an optimal pH for storage stability of the pharmaceutical composition. In some embodiments, the pH of the pharmaceutical composition is between 6.0 and 7.5. In some embodiments, the pH is between 6.3 and 7.0. In further embodiments, the pH is 6.5. Ideally the pH of the pharmaceutical composition allows for both stability of liposome membrane lipids and retention of the entrapped entities. Histidine, hydroxyethylpiperazine-ethylsulfonate (HEPES), morpholipoethylsulfonate (MES), succinate, tartrate, and citrate, typically at 2-20 mM concentration, are exemplary buffer substances. Other suitable carriers include, e.g., water, buffered aqueous solution, 0.4% NaCl, and 0.3% glycine. Protein, carbohydrate, or polymeric stabilizers and tonicity adjusters can be added, e.g., gelatin, albumin, dextran, or polyvinylpyrrolidone. The tonicity of the composition can be adjusted to the physiological level of 0.25-0.35 mol/kg with glucose or a more inert compound such as lactose, sucrose, mannitol, or dextrin. These compositions can routinely be sterilized using conventional, sterilization techniques known in the art (e.g., by filtration). The resulting aqueous solutions can be packaged for use or filtered under aseptic conditions and lyophilized, the lyophilized preparation being combined with a sterile aqueous medium prior to administration. 
     The provided pharmaceutical liposome compositions can also contain other pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions, such as pH adjusting and buffering agents, and tonicity adjusting agents, for example, sodium acetate, sodium lactate, sodium chloride, potassium chloride, and calcium chloride. Additionally, the liposome suspension may include lipid-protective agents which protect lipids against free-radical and lipid-peroxidative damages on storage. Lipophilic free-radical quenchers, such as alpha-tocopherol and water-soluble iron-specific chelators, such as ferrioxamine, are suitable. 
     The liposome concentration in the provided fluid pharmaceutical formulations can vary widely depending upon need, e.g., from less than about 0.05% usually or at least about 2-10% to as much as 30-50% by weight and will be selected primarily by fluid volumes, and viscosities, in accordance with the particular mode of administration selected. For example, the concentration may be increased to lower the fluid load associated with treatment. This may be particularly desirable in patients having atherosclerosis-associated congestive heart failure or severe hypertension. Alternatively, liposome pharmaceutical compositions composed of irritating lipids may be diluted to low concentrations to lessen inflammation at the site of administration. 
     Some embodiments, relate to a method of delivering a targeted pegylated liposomal formulation of alpha polyglutamated raltitrexed, to a tumor expressing folate receptor on its surface. An exemplary method comprises the step of administering a liposome pharmaceutical composition provided herein in an amount to deliver a therapeutically effective dose of the targeted pegylated liposomal alpha polyglutamated raltitrexed to the tumor. 
     The amount of liposome pharmaceutical composition administered will depend upon the particular alpha polyglutamated raltitrexed entrapped inside the liposomes, the disease state being treated, the type of liposomes being used, and the judgment of the clinician. Generally the amount of liposome pharmaceutical composition administered will be sufficient to deliver a therapeutically effective dose of the particular therapeutic entity. 
     The quantity of liposome pharmaceutical composition necessary to deliver a therapeutically effective dose can be determined by routine in vitro and in vivo methods, common in the art of drug testing. See, for example, D. B. Budman, A. H. Calvert, E. K. Rowinsky (editors). Handbook of Anticancer Drug Development, LWW, 2003. Therapeutically effective dosages for various therapeutic compositions are known to those skilled in the art. In some embodiments, a therapeutic entity delivered via the pharmaceutical liposome composition and provides at least the same or higher activity than the activity obtained by administering the same amount of the therapeutic entity in its routine non-liposome formulation. Typically the dosages for the liposome pharmaceutical composition is in a range for example, between about 0.005 and about 5000 mg of the therapeutic entity per square meter of body surface area most often, between about 0.1 and about 1000 mg therapeutic entity per square meter of body surface area. 
     For example, if the subject has a tumor, an effective amount may be that amount of the agent (e.g., alpha polyglutamated raltitrexed composition) that reduces the tumor volume or load (as for example determined by imaging the tumor). Effective amounts can also routinely be assessed by the presence and/or frequency of cancer cells in the blood or other body fluid or tissue (e.g., a biopsy). If the tumor is impacting the normal functioning of a tissue or organ, then the effective amount can routinely be assessed by measuring the normal functioning of the tissue or organ. In some instances the effective amount is the amount required to lessen or eliminate one or more, and preferably all, symptoms. 
     Pharmaceutical compositions comprising the alpha polyglutamated raltitrexed compositions (e.g., liposomes containing a pentaglutamated or hexaglutamated raltitrexed) are also provided. Pharmaceutical compositions are sterile compositions that comprise a sample liposome and preferably alpha polyglutamated raltitrexed, preferably in a pharmaceutically-acceptable carrier. 
     Unless otherwise stated herein, a variety of administration routes are available. The particular mode selected will depend, upon the particular active agent selected, the particular condition being treated and the dosage required for therapeutic efficacy. The provided methods can be practiced using any known mode of administration that is medically acceptable and in accordance with good medical practice. In some embodiments, the administration route is an injection. In further embodiments, the injection is by a parenteral route elected from an intramuscular, subcutaneous, intravenous, intraarterial, intraperitoneal, intraarticular, intraepidural, intrathecal, intravenous, intramuscular, or intra sternal injection. In some embodiments, the administration route is an infusion. In additional embodiments, the administration route is oral, nasal, mucosal, sublingual, intratracheal, ophthalmic, rectal, vaginal, ocular, topical, transdermal, pulmonary, or inhalation. 
     Therapeutic compositions containing αPRTX compositions such as the liposomal αPRTX compositions described herein can be conventionally administered intravenously, as by injection of a unit dose, for example. The term “unit dose” when used in reference to a therapeutic composition provided herein refers to physically discrete units suitable as unitary dosage for the subject, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with the required diluent; e.g., carrier, or vehicle. In a specific embodiment, therapeutic compositions containing an Adapter are administered subcutaneously. 
     In some embodiments, the α-PRTX composition is administered in a manner compatible with the dosage formulation, and in a therapeutically effective amount. The quantity to be administered depends on the subject to be treated, capacity of the subject&#39;s system to utilize the active ingredient, and degree of therapeutic effect desired. Precise amounts of active ingredient required to be administered depend on the judgment of the practitioner and are peculiar to each individual. However, suitable dosage ranges for systemic application are disclosed herein and depend on the route of administration. Suitable regimes for administration are also variable, but are typified by an initial administration followed by repeated doses at one or more hour intervals by a subsequent injection or other administration. Alternatively, continuous intravenous infusion sufficient to maintain concentrations in the blood in the ranges specified for in vivo therapies are contemplated. 
     The αPRTX composition are formulated, dosed, and administered in a fashion consistent with good medical practice. Factors for consideration in this context include the particular disorder being treated, the particular patient being treated, the clinical condition of the individual patient, the cause of the disorder, the site of delivery of the agent, the method of administration, the scheduling of administration, and other factors known to medical practitioners. The dosage ranges for the administration of αPRTX composition are those large enough to produce the desired effect in which the disease symptoms mediated by the target molecule are ameliorated. The dosage should not be so large as to cause adverse side effects, such as, hyperviscosity syndromes, pulmonary edema, congestive heart failure, and other adverse side effects known in the art. Generally, the dosage will vary with the age, weight, height, body surface area, state of health (e.g., renal and liver function), condition, sex and extent of the disease in the patient and can routinely be determined by one of ordinary skill in the art. The dosage can be adjusted by the individual physician in the event of any complication. 
     The dosage schedule and amounts effective for therapeutic and prophylactic uses, i.e., the “dosing regimen,” will depend upon a variety of factors, including the cause, stage and severity of the disease or disorder, the health, physical status, age of the subject being treated, and the site and mode of the delivery of the αPRTX composition. Therapeutic efficacy and toxicity of the αPRTX composition can be determined by standard pharmaceutical, pharmacological, and toxicological procedures in cell cultures or experimental animals. Data obtained from these procedures can likewise be used in formulating a range of dosages for human use. Moreover, therapeutic index (i.e., the dose therapeutically effective in 50 percent of the population divided by the dose lethal to 50 percent of the population (ED50/LD50)) can readily be determined using known procedures. The dosage is preferably within a range of concentrations that includes the ED50 with little or no toxicity, and may vary within this range depending on the dosage form employed, sensitivity of the patient, and the route of administration. 
     The dosage regimen also takes into consideration pharmacokinetics parameters known in the art, such as, drug absorption rate, bioavailability, metabolism and clearance (see, e.g., Hidalgo-Aragones, J. Steroid Biochem. Mol. Biol. 58:611-617 (1996); Groning et al., Pharmazie 51:337-341 (1996); Fotherby, Contraception 54:59-69 (1996); and Johnson et al., J. Pharm. Sci. 84:1144-1146 (1995)). It is well within the state of the art for the clinician to determine the dosage regimen for each subject being treated. Moreover, single or multiple administrations of the αPRTX composition can be administered depending on the dosage and frequency as required and tolerated by the subject. The duration of prophylactic and therapeutic treatment will vary depending on the particular disease or condition being treated. Some diseases are amenable to acute treatment whereas others require long-term, chronic therapy. The αPRTX composition can be administered serially, or simultaneously with the additional therapeutic agent. 
     In some embodiments, the αPRTX composition is administered in a liposomal composition at a dose of between 0.005 and 5000 mg of αPRTX per square meter of body surface area, or any range therein between. In further embodiments, the αPRTX composition is administered in a liposomal composition at a dose of between 0.1 and 1000 mg αPRTX/meter squared of body surface area, or any range therein between. 
     In some embodiments, the αPRTX composition is administered in an immunoconjugate composition at a dose of 1 mg/kg to 500 mg/kg, 1 mg/kg to 250 mg/kg, 1 mg/kg to 200 mg/kg, 1 mg/kg to 150 mg/kg, 1 mg/kg to 100 mg/kg, 1 mg/kg to 50 mg/kg, 1 mg/kg to 25 mg/kg, 1 mg/kg to 20 mg/kg, 1 mg/kg to 15 mg/kg, 1 mg/kg to 10 mg/kg, or 1 mg/kg to 5 mg/kg, or any range therein between. 
     In another embodiment, the αPRTX composition is administered in combination with one or more additional therapeutics. 
     In some embodiment, the PLp-αPRTX and/or targeted-PLp-αPRTX is prepared as an infusion composition, an injection composition, a parenteral composition, or a topical composition. In further embodiments, the injection includes one or more of: intraperitoneal injection, direct intratumor injection, intra-arterial injection, and intravenous injection, subcutaneous injection, intramuscular injection, delivery via transcutaneous and intranasal route. In a further embodiment, the PLp-αPRTX and/or targeted-PLp-αPRTX is a liquid solution or a suspension. However, solid forms suitable for solution in, or suspension in, liquid vehicles prior to injection are also provided herein. In some embodiments, the targeted pegylated liposomal alpha polyglutamated raltitrexed composition is formulated as an enteric-coated tablet or gel capsule according to methods known in the art. 
     In some embodiments, the targeted pegylated liposomal alpha polyglutamated raltitrexed formulations are administered to a tumor of the central nervous system using a slow, sustained intracranial infusion of the liposomes directly into the tumor (e.g., a convection-enhanced delivery (CED)). See, Saito et al., Cancer Research 64:2572-2579 (2004); Mamot et al., J. Neuro-Oncology 68:1-9 (2004). In other embodiments, the formulations are directly applied to tissue surfaces. Sustained release, pH dependent release, and other specific chemical or environmental condition-mediated release administration of the pegylated liposomal alpha polyglutamated raltitrexed formulations (e.g., depot injections and erodible implants) are also provided. Examples of such release-mediating compositions are further described herein or otherwise known in the art. 
     For administration by inhalation, the compositions can be conveniently delivered in the form of an aerosol spray presentation from pressurized packs or a nebulizer, with the use of a suitable propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, ichlorotetrafluoroethane, carbon dioxide or other suitable gas. In the case of a pressurized aerosol, the dosage unit can be determined by providing a valve to deliver a metered amount. 
     When it is desirable to deliver the compositions systemically, they can formulated for parenteral administration by injection, e.g., by bolus injection or continuous infusion. Formulations for injection can be presented in unit dosage form, e.g., in ampoules or in multi-dose containers. Pharmaceutical parenteral formulations include aqueous solutions of the ingredients. Aqueous injection suspensions can contain substances which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran. Alternatively, suspensions of liposomes can be prepared as oil-based suspensions. Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate or triglycerides. 
     Alternatively, the non-targeted or targeted pegylated liposomal alpha polyglutamated raltitrexed can be in powder form or lyophilized form for constitution with a suitable vehicle, e.g., sterile pyrogen-free water, before use. 
     The provided compositions (e.g., alpha polyglutamated raltitrexed and liposomes containing the alpha polyglutamated raltitrexed) can also be formulated in rectal or vaginal compositions such as suppositories or retention enemas, e.g., containing conventional suppository bases such as cocoa butter or other glycerides. 
     Methods of Use and Treatment 
     In additional embodiments, the disclosure provides methods of using alpha polyglutamated raltitrexed (αPRTX) compositions. In some embodiments, the alpha αPRTX compositions are used to treat a disease or disorder. 
     In some embodiments, the disclosure provides a method of killing a cell that comprises contacting the cell with a composition comprising an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, the contacted cell is a mammalian cell. In further embodiments, the contacted cell is a human cell. In some embodiments, the contacted cell is a hyperproliferative cell. In further embodiments, the hyperproliferative cell is a cancer cell. In yet further embodiments, the cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from the group consisting of: a non-hematologic malignancy including such as for example, lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, and melanoma; and a hematologic malignancy such as for example, a leukemia, a lymphoma and other B cell malignancies, myeloma and other plasma cell dysplasias or dyscrasias. In yet further embodiments, the cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from colorectal cancer, breast cancer, ovarian cancer, lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, and mesothelioma. In some embodiments, the method is performed in vivo. In other embodiments, the method is performed in vitro. In some embodiments, the αPRTX composition contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the αPRTX composition comprises alpha pentaglutamated raltitrexed. In some embodiments, the αPRTX composition comprises alpha hexaglutamated raltitrexed. In some embodiments, the αPRTX composition comprises L alpha polyglutamated raltitrexed. In some embodiments, the αPRTX composition comprises D alpha polyglutamated raltitrexed. In some embodiments, the αPRTX composition comprises L and D alpha polyglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method of killing a cell that comprises contacting the cell with a liposome containing alpha polyglutamated raltitrexed (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX disclosed herein). In some embodiments, the liposome is pegylated (e.g., PLp-αPRTX and NTPLp-αPRTX). In some embodiments, the liposome comprises a targeting moiety on its surface that has specific affinity for an epitope of an antigen on the surface of the cell (e.g., TLp-αPRTX and TPLp-αPRTX). In further embodiments, the liposome is pegylated and comprises a targeting moiety on its surface that specifically binds an antigen on the surface of the cell (e.g., TPLp-αPRTX). In some embodiments, the contacted cell is a mammalian cell. In further embodiments, the contacted cell is a human cell. In additional embodiments, the contacted cell is a hyperproliferative cell. In further embodiments, the hyperproliferative cell is a cancer cell. In further embodiments, the contacted cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from the group consisting of: lung cancer (e.g., non-small cell), pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, myeloma, a leukemia and a lymphoma. In some embodiments, the method is performed in vivo. In other embodiments, the method is performed in vitro. In some embodiments, the liposome contains an αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome comprises L alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises D alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises L and D alpha polyglutamated raltitrexed. 
     In some embodiments, the disclosure provides a method of killing a hyperproliferative cell that comprises contacting a hyperproliferative cell with a delivery vehicle (e.g., a liposome or antibody) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the delivery vehicle is non-targeted. In other embodiments, the delivery vehicle is targeted and comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the hyperproliferative cell. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on an antigen on the surface of the hyperproliferative cell selected from the group consisting of GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle comprises a targeting moiety that specifically binds a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the method is performed in vivo. In some embodiments, the method is performed in vitro. In some embodiments, the delivery vehicle comprises an αPRTX consisting of 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In particular embodiments, the method of a killing a hyperproliferative cell is performed using a liposome delivery vehicle that comprises alpha polyglutamated raltitrexed (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX disclosed herein). In some embodiments, the delivery vehicle is an non-targeted liposome. In some embodiments, the delivery vehicle comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the hyperproliferative cell (e.g., TLp-αPRTX and TPLp-αPRTX). In some embodiments, the delivery vehicle is a liposome comprising a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the hyperproliferative cell. In further embodiments, the targeting moiety has specific affinity for an epitope on an antigen selected from the group consisting of GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the liposome comprises a targeting moiety that specifically binds a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the liposome is pegylated (e.g., PLp-αPRTX, and NTPLp-αPRTX). In further embodiments, the liposome is pegylated and comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the hyperproliferative cell (e.g., TPLp-αPRTX). In other embodiments, the embodiments, the liposome is unpegylated. In some embodiments, the liposome is unpegylated and the liposome comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the hyperproliferative cell (e.g., TPLp-αPRTX). In some embodiments, the liposome comprises an αPRTX consisting of 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposome comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposome comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposome comprises L alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises D alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises L and D alpha polyglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method of inhibiting the proliferation of a cancer cell that comprises contacting the cancer cell with a delivery vehicle (e.g., a liposome or antibody) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the delivery vehicle is non-targeted. In some embodiments, the delivery vehicle is targeted and comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the cancer cell. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle is an antibody that has specific affinity for an epitope on an antigen on the surface of the cancer cell. In some embodiments, the contacted cancer cell is a mammalian cell. In further embodiments, the contacted cancer cell is a human cell. In additional embodiments, the contacted cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from the group consisting of: lung cancer (e.g., non-small cell), pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, myeloma, a leukemia and a lymphoma. In some embodiments, the method is performed in vivo. In some embodiments, the method is performed in vitro. In some embodiments, the delivery vehicle is an antibody that has specific affinity for an epitope on one of the above-listed cell surface antigens. In other embodiments, the targeting vehicle is a liposome that comprises a targeting moiety that has specific affinity for an epitope on the surface of the cancer cell. In other embodiments, the targeting vehicle is a liposome that comprises a targeting moiety that has specific affinity for an epitope on one of the above-listed cell surface antigens. In some embodiments, the delivery vehicle is a liposome that is pegylated. In other embodiments, the delivery vehicle is a liposome that is unpegylated. In some embodiments, the delivery vehicle comprises a αPRTX composition containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In further embodiments, the disclosure provides a method of inhibiting the proliferation of a cancer cell that comprises contacting the cancer cell with a liposome comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, the liposome is non-targeted. In some embodiments, the liposome is targeted and comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of the cancer cell. In further embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle comprises a targeting moiety that specifically binds a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the contacted cancer cell is a mammalian cell. In further embodiments, the contacted cancer cell is a human cell. In additional embodiments, the contacted cancer cell is a primary cell or a cell from a cell line obtained/derived from a cancer selected from the group consisting of: lung cancer (e.g., non-small cell), pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, myeloma, a leukemia and a lymphoma. In some embodiments, the method is performed in vivo. In some embodiments, the method is performed in vitro. In other embodiments, the targeting vehicle is a liposome that comprises a targeting moiety that has specific affinity for an epitope on one of the above-listed cell surface antigens. In some embodiments, the liposome is pegylated. In other embodiments, the liposome that is unpegylated. In some embodiments, the liposome comprises an αPRTX composition containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposome comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposome comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposome comprises L alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises D alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises L and D alpha polyglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method for treating a hyperproliferative disorder that comprises administering an effective amount of a delivery vehicle (e.g., antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having a hyperproliferative disorder. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the administered delivery vehicle comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of the hyperproliferative cell. In additional embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle comprises a targeting moiety that specifically binds (i.e., has specific affinity for) an epitope on a cell surface antigen a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the administered delivery vehicle does not comprise a targeting moiety that has a specific affinity for an epitope on a cell surface antigen of the hyperproliferative cell. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the hyperproliferative disorder is cancer. In some embodiments, the hyperproliferative disorder is an autoimmune disease (e.g., rheumatoid arthritis). In some embodiments, the hyperproliferative disorder is a benign or malignant tumor; leukemia, hematological, or lymphoid malignancy. In other embodiments, the hyperproliferative disorder selected from the group consisting of a: neuronal, glial, astrocytal, hypothalamic, glandular, macrophagal, epithelial, stromal, blastocoelic, inflammatory, angiogenic and immunologic disorder, including an autoimmune disease. 
     In additional embodiments, the disclosure provides a method for treating a hyperproliferative disorder that comprises administering an effective amount of a liposome comprising alpha polyglutamated raltitrexed (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX) to a subject having or at risk of having a hyperproliferative disorder. In some embodiments, the liposome is pegylated. In some embodiments, the liposome is not pegylated. In additional embodiments, the liposome comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of the hyperproliferative cell. In additional embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the liposome does not comprise a targeting moiety that has a specific affinity for an epitope on a cell surface antigen of the hyperproliferative cell. In some embodiments, the liposome comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposome comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposome comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposome comprises L alpha polyglutamated raltitrexed. In some embodiments, liposome comprises D alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the hyperproliferative disorder is cancer. In some embodiments, the hyperproliferative disorder is an autoimmune disease (e.g., rheumatoid arthritis). In some embodiments, the hyperproliferative disorder is a benign or malignant tumor; leukemia, hematological, or lymphoid malignancy. In other embodiments, the hyperproliferative disorder is selected from the group consisting of a: neuronal, glial, astrocytal, hypothalamic, glandular, macrophagal, epithelial, stromal, blastocoelic, inflammatory, angiogenic and immunologic disorder, including an autoimmune disease. 
     Exemplary hyperproliferative disorders that can be treated according to the disclosed methods include, but are not limited to, disorders associated with benign, pre-malignant, and malignant cellular proliferation, including but not limited to, neoplasms and tumors (e.g., histiocytoma, glioma, astrocytoma, osteoma), cancers (e.g., lung cancer, small cell lung cancer, gastrointestinal cancer, bowel cancer, colorectal cancer, breast carcinoma, ovarian carcinoma, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreatic cancer, brain cancer, sarcoma (e.g., osteosarcoma, Kaposi&#39;s sarcoma), and melanoma), leukemias, psoriasis, bone diseases, fibroproliferative disorders (e.g., of connective tissues), and atherosclerosis. 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a delivery vehicle (e.g., antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having cancer. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the administered delivery vehicle comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a cancer cell. In additional embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the cancer is selected from the group consisting of: lung (e.g., non-small lung cancer), pancreatic, breast cancer, ovarian, lung, prostate, head and neck, gastric, gastrointestinal, colon, esophageal, cervical, kidney, biliary duct, gallbladder, and a hematologic malignancy (e.g., a leukemia or lymphoma). 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposome comprising alpha polyglutamated raltitrexed (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX) to a subject having or at risk of having cancer. In some embodiments, the liposome is pegylated. In some embodiments, the liposome is not pegylated. In additional embodiments, the liposome comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a cancer cell. In additional embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the liposome comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the liposome comprises alpha tetraglutamated raltitrexed. In some embodiments, the liposome comprises alpha pentaglutamated raltitrexed. In other embodiments, the liposome comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposome comprises L alpha polyglutamated raltitrexed. In some embodiments, liposome comprises D alpha polyglutamated raltitrexed. In some embodiments, the liposome comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the cancer is selected from the group consisting of: lung (e.g., non-small lung cancer), pancreatic, breast cancer, ovarian, lung, prostate, head and neck, gastric, gastrointestinal, colon, esophageal, cervical, kidney, biliary duct, gallbladder, and a hematologic malignancy (e.g., a leukemia or lymphoma). 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering to a subject having or at risk of having cancer, an effective amount of a liposomal composition containing a liposome that comprises alpha polyglutamated raltitrexed and a targeting moiety that has a specific affinity for an epitope of antigen on the surface of the cancer. In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting: of GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen(s) derived from, or determined to be expressed on, a specific subject&#39;s cancer (tumor) such as a neoantigen. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are not pegylated. In some embodiments, liposomes of the administered liposomal composition comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: lung cancer, pancreatic, breast cancer, ovarian cancer, lung cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colon cancer, esophageal cancer, cervical cancer, kidney cancer, biliary duct cancer, gallbladder cancer, and a hematologic malignancy. 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of a tumor specific antigen (TSA) or tumor associated antigen (TAA). In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen selected from the group consisting of: a tumor differentiation antigen (e.g., MART1/MelanA, gp100 (Pmel 17), tyrosinase, TRP1, and TRP2), a tumor-specific multilineage antigen (e.g., MAGE1, MAGE3, BAGE, GAGE1, GAGE2, and p15), an overexpressed embryonic antigen (e.g., carcinoembryonic antigen (CEA)), an overexpressed oncogene or mutated tumor-suppressor gene product (e.g., p53, Ras, and HER2/neu), a unique tumor antigen resulting from chromosomal translocations (e.g., BCR-ABL, E2A-PRL, H4-RET, IGH-IGK, and MYL-RAR), a viral antigen (e.g., Epstein Barr virus antigen EBVA, human papillomavirus (HPV) antigen E6 or E7), GP 100), prostatic acid phosphatase (PAP), prostate-specific antigen (PSA), PTGER4, ITGA4, CD37, CD52, CD62L (L-selectin), CXCR4, CD69, EVI2B (CD361), SLC39A8, MICB, LRRC70, CLELC2B, HMHA1, LST1, and CMTM6 (CKLFSF6). 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of a hematologic tumor antigen. In further embodiments, the targeting moiety has specific affinity for an epitope of a hematologic tumor antigen selected from the group consisting of: CD19, CD20, CD22, CD30, CD138, CD33 CD34, CD38, CD123, CS1, ROR1, Lewis Y , Ig kappa light chain, TCR, BCMA, TACI, BAFFR (CD268), CALLA, and a NKG2DL ligand). In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of a B-cell lymphoma-specific idiotype immunoglobulin, or a B-cell differentiation antigen (e.g., CD19, CD20, and CD37). In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen on a multiple myeloma cell (e.g., CS-1, CD38, CD138, MUC1, HM1.24, CYP1B1, SP17, PRAME, Wilms&#39; tumor 1 (WT1), and heat shock protein gp96) or an antigen on myeloid cells (e.g., TSLPR and IL-7R). 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of a solid tumor antigen. In further embodiments, the targeting moiety has specific affinity for an epitope of a hematologic tumor antigen selected from the group consisting of: disialoganglioside (GD2), o-acetyl GD2, EGFRvIII, ErbB2, VEGFR2, FAP, mesothelin, IL13Ra2 (glioma), cMET, PSMA, L1CAM, CEA, and EGFR. In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen selected from the group consisting of: CD137, PDL1, CTLA4, CD47, KIR, TNFRSF10B (DR5), TIM3, PD1, cMet, Glycolipid F77, EGFRvIII, HLAA2 (NY-ESO-1), LAG3, CD134 (OX40), HVEM, BTLA, TNFRSF25 (DR3), CD133, MAGE A3, PSCA, MUC1, CD44v6, CD44v6/7, CD44v7/8, IL11Ra, ephA2, CAIX, MNCAIX, CSPG4, MUC16, EPCAM (EGP2), TAG72, EGP40, ErbB receptor family, ErbB2 (HER2), ErbB3/4, RAGE1, GD3, FAR, Lewis Y , NCAM, HLAA1/MAGE1, MAGEA1, MAGEA3, MAGE-A4, B7H3, WT1, MelanA (MART1), HPVE6, HPVE7, thyroglobulin, tyrosinase, PSA, CLL1GD3, Tn Ag, FLT3, KIT, PRSS21, CD24, PDGFR-beta, SSEA4, prostase, PAP, ELF2M, ephB2, IGF1, IGFII, IGFI receptor, LMP2, gp100, bcr-abl, Fucosyl GM1, sLe, GM3, TGS5, folate receptor beta, TEM1 (CD248), TEM7R, CLDN6, TSHR, GPRC5D, CXORF61, CD97, CD7a, HLE, CD179a, ALK, Plysialic acid, PLAC1, GloboH, NY-BR-1, UPK2, HAVCR1, ADRB3, PANX3, GPR20, LY6K, OR51E2, TARP, LAGE1a, legumain, E7, ETV6-AML, sperm protein 17, XAGE1, Tie 2, MAD-CT1, MAD-CT2, Fos-related antigen 1, p53, p53 mutant, prostein, survivin, telomerase, PCTA1 (Galectin 8), Ras mutant, hTERT, sarcoma translocation breakpoints, ML-IAP, ERG (TMPRSS2 ETS fusion gene), NA17, PAX3, Androgen receptor, Cyclin B1, MYCN, RhoC, TRP2, CYP1B1, BORIS, SART3, PAX5, OY-TES1, LCK, AKAP4, SSX2, reverse transcriptase, RU1, RU2, intestinal carboxyl esterase, neutrophil elastase, mut hsp70-2, CD79a, CD79b, CD72, LAIR1, FCAR, LILRA2, CD300LF, CLEC12A, BST2, EMR2, LY75, GPC3, FCRLS, IGLL1, TSP-180, MAGE4, MAGE5, MAGE6, VEGFR1, IGF1R, hepatocyte growth factor receptor, p185ErbB2, p180ErbB-3, nm-23H1, CA 19-9, CA 72-4, CAM 17.1, NuMa, K-ras, beta-Catenin, CDK4, Mum1, p15, p16, 43-9F, 5T4, 791Tgp72, 3-human chorionic gonadotropin, BCA225, BTAA, CA125, CA15-3, CA 27.29 (BCAA), CA195, CA242, CA-50, CAM43, CD68, CO-029, FGF5, G250, HTgp-175, M344, MA50, MG7-Ag, MOV18, NB/70K, NY-CO1, RCAS1, SDCCAG16, M2BP, TAAL6, TLP, and TPS, glioma-associated antigen, alpha-fetoprotein (AFP), p26 fragment of AFP, lectin-reactive AFP, and TLR4. 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen selected from the group consisting of: PDGFRA, VEGFR1, VEGFR3, neuropilin 1 (NRP1), neuropilin 2 (NRP2), betacellulin, PLGF, RET (rearranged during transfection), TIE1, TIE2 (TEK), CA125, CD3, CD4, CD7, CD10, CD13, CD25 CD32, CD32b, CD44 (e.g., CD44v6), CD47, CD49e (integrin alpha 5), CD54 (ICAM), CD55, CD64, CD74, CD80, CD90, CD200, CD147, CD166, CD200, ESA, SHH, DHH, IHH, patched 1 (PTCH1), smoothened (SMO), WNT1, WNT2B, WNT3A, WNT4, WNT4A, WNT5A, WNT5B, WNT7B, WNT8A, WNT10A, WNT10B, WNT16B, LKP5, LRP5, LRP6, FZD1, FZD2, FZD4, FZD5, FZD6, FZD7, FZD8, Notch1, Notch1, Notch3, Notch4, DLL4, Jagged, Jagged1, Jagged2, Jagged3, TNFRSF1A (TNFR1, p55, p60), TNFRSF1B (TNFR2), TNFRSF6 (Fas, CD95), TNFRSF6B (DcR3), TNFRSF7 (CD27), TNFSF9 (41BB Ligand), TNFRSF8 (CD30), TNFRSF10A (TRAILRl, DR4), TNFRSF11A (RANK), TNFRSF12 (TWEAKR), TNFRSF19L (KELT), TNFRSF19 (TROY), TNFRSF21 (DR6), ILIRI, 1L1R2, IL2R, IL5R, IL6R, 1L8R, IL10R, IL12R, IL13R, IL15R, IL18R, IL19R, IL21R, IL23R, XAG1, XAG3, REGIV, FGFR1, FGFR2, FGFR3, ALK, ALK1, ALK7, ALCAM, Axl, TGFb, TGFb2, TGFb3, TGFBR1, IGFIIR, BMPRI, N-cadherin, E-cadherin, VE-cadherin, ganglioside GM2, ganglioside GD3, PSGR, DCC, CDCP1, CXCR2, CXCR7, CCR3, CCR4, CCR5, CCR7, CCR10, Claudin1, Claudin2, Claudin3, Claudin4, TMEFF2, neuregulin, MCSF, CSF, CSFR (fms), GCSF, GCSFR, BCAM, BRCA1, BRCA2, HLA-DR, ABCC3, ABCB5, HM 1.24, LFA1, LYNX, S100A8, S100A9, SCF, Von Willebrand factor, Lewis Y6 receptor, CA G250 (CA9), CRYPTO, VLA5, HLADR, MUC18, mucin CanAg, EGFL7, integrin avb3, integrin U5 activin Bl alpha, leukotriene B4 receptor (LTB4R), neurotensin NT receptor (NTR), 5T4 oncofetal antigen, Tenascin C, MMP, MMP2, MMP7, MMP9, MMP12, MMP14, MMP26, cathepsin G, SULF1, SULF2, MET, CA9, TM4SF1, syndecan (SDCl), Ephrin B4, TEM1, TGFbeta 1, and TGFBRII. 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen associated with a disorder of the immune system (e.g., an autoimmune disorder and an inflammatory disorder), or is associated with regulating an immune response. In some embodiments, the targeting moiety has specific affinity for an epitope of a cell surface antigen expressed on the surface of a macrophage (expressing CD44). 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an immunoinhibitory target. In another embodiment, the AD is an epitope of an immunoinhibitory target selected from the group consisting of: IL1Ra, IL6R, CD26L, CD28, CD80, and FcGamma RIIB. In another embodiment, the AD in the Adapter is an epitope of an immunostimulatory target selected from: CD25, CD28, CTLA4, PD1, B7H1 (PDL1), B7H4 TGFbeta, TNFRSF4 (OX40), TNFRSF5 (CD40), TNFRSF9 (41BB, CD137), TNFRSF14 (HVEM), TNFRSF25 (DR3), and TNFRSF18 (GITR). 
     In some embodiments, the liposome comprises a targeting moiety that has specific affinity for an epitope of an antigen selected from the group consisting of: IL1Rb, C3AR, C5AR, CXCR1, CXCR2, CCR1, CCR3, CCR7, CCR8, CCR9, CCR10, ChemR23, MPL, GP130, TLR2, TLR3, TLR4, TLR5, TLR7, TLR8, TLR9, TREM1, TREM2, CD49a (integrin alpha 1), integrin a5b3, alpha4 integrin subunit, A4B7 integrin, cathepsin G, TNFRSF3 (LTBR), TNFRSF6 (Fas, CD95), TNFRSF6B (DcR3), TNFRSF8 (CD30), TNFRSF11A (RANK), TNFRSF16 (NGFR), TNFRSF19L (RELT), TNFRSF19 (TROY), TNFRSF21 (DR6), CD14, CD23, CD36, CD36L, CD39, CD91, CD153, CD164, CD200, CD200R, B71 (CD80), B72 (CD86), B7h, B7DC (PDL2), ICOS, ICOSL, MHC, CD, B7H2, B7H3, B7x, SLAM, KIM1, SLAMF2, SLAMF3, SLAMF4, SLAMF5, SLAMF6, SLAMF7, TNFRSF1A (TNFR1, p55, p60), TNFRSF1B (TNFR2), TNFRSF7 (CD27), TNFRSF12 (TWEAKR), TNFRSF5 (CD40), IL1R, IL2R, IL4Ra, IL5R, IL6RIL15R, IL17R, IL17Rb, IL17RC, IL22RA, IL23R, TSLPR, B7RP1, cKit, GMCSF, GMCSFR, CD2, CD4, CD11a, CD18, CD30, CD40, CD86, CXCR3, CCR2, CCR4, CCR5, CCR8, RhD, IgE, and Rh. 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposomal composition to a subject having or at risk of having a cancer that expresses folate receptor on its cell surface, wherein the liposomal composition comprises liposomes that comprise (a) alpha polyglutamated raltitrexed (αPRTX) and (b) a targeting moiety that has specific binding affinity for a folate receptor. In some embodiments, the targeting moiety has specific binding affinity for folate receptor alpha (FR-α), folate receptor beta (FR-β), and/or folate receptor delta (FR-δ). In some embodiments, the targeting moiety has a specific binding affinity for folate receptor alpha (FR-α), folate receptor beta (FR-β), and/or folate receptor delta (FR-δ). In some embodiments, the targeting moiety has a specific binding affinity for folate receptor alpha (FR-α) and folate receptor beta (FR-β). In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are not pegylated. In some embodiments, liposomes of the administered liposomal composition comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprises alpha hexaglutamated raltitrexed. In some embodiments, the liposomal composition is administered to treat an epithelial tissue malignancy. In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: lung cancer, pancreatic, breast cancer, ovarian cancer, lung cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colon cancer, esophageal cancer, cervical cancer, kidney cancer, biliary duct cancer, gallbladder cancer, and a hematologic malignancy. 
     In some embodiments, the disclosure provides a method for treating lung cancer (e.g., non-small lung cancer) that comprises administering an effective amount of a delivery vehicle (e.g., an antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having lung cancer. In particular embodiments, the, the cancer is non-small cell lung cancer. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the delivery vehicle comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of a lung cancer (e.g., non-small cell lung cancer) cell. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from the group consisting of Mucin 1, Nectin 4, NaPi2b, CD56, EGFR, and SC-16. In some embodiments, the targeting moiety is an antibody or a fragment of an antibody. In additional embodiments, the delivery vehicle is a liposome, and the liposome comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from the group consisting of Mucin 1, Nectin 4, NaPi2b, CD56, EGFR, and SC-16. In further embodiments, the delivery vehicle is a pegylated liposome that comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from consisting of Mucin 1, Nectin 4, NaPi2b, CD56, EGFR, and SC-16. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In some embodiments, the disclosure provides a method for treating pancreatic cancer that comprises administering an effective amount of a delivery vehicle (e.g., an antibody (ADC) or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having pancreatic cancer. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the delivery vehicle comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of a pancreatic cancer cell. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from the group consisting of TACSTD2 (TROP2), Mucin 1, mesothelin, Guanylyl cyclase C (GCC), SLC44A4, and Nectin 4. In further embodiments, the delivery vehicle is a liposome, and the liposome comprises a targeting moiety has specific affinity for an epitope on an antigen selected from the group consisting of TACSTD2 (TROP2), Mucin 1, Mesothelin, Guanylyl cyclase C (GCC), SLC44A4, and Nectin 4. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method for treating breast cancer (e.g., triple negative breast cancer (estrogen receptor − , progesterone receptor − , and HER2)) that comprises administering an effective amount of a delivery vehicle (e.g., an antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having breast cancer. In some embodiments, the administered delivery vehicle is a liposome that comprises alpha polyglutamated raltitrexed. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the delivery vehicle comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of a breast cancer cell. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from the group consisting of: LIV-1 (ZIP6), EGFR, HER2, HER3, Mucin 1, GONMB, and Nectin 4. In some embodiments, the targeting moiety is an antibody or a fragment of an antibody. In additional embodiments, the delivery vehicle is a liposome, and the liposome comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from the group consisting of: LIV-1 (ZIP6), EGFR, HER2, HER3, Mucin 1, GONMB, and Nectin 4. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In some embodiments, the disclosure provides a method for treating a hematological cancer that comprises administering an effective amount of a delivery vehicle (e.g., an antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having a hematological cancer. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX)). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the delivery vehicle comprises a targeting moiety on its surface that has specific affinity for an epitope on an antigen on the surface of a hematological cancer cell. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on an antigen selected from the group consisting of: CD30, CD79b, CD19, CD138, CD74, CD37, CD19, CD22, CD33, CD34, and CD98. In further embodiments, the delivery vehicle is a liposome, and the liposome comprises a targeting moiety has specific affinity for an epitope on an antigen selected from the group consisting of: CD30, CD79b, CD19, CD138, CD74, CD37, CD19, CD22, CD33, CD34, and CD98. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed 
     In some embodiments, the disclosure provides a method for treating a subject having or at risk of having a cancer that is distinguishable by the expression of an antigen on its cell surface. Thus, in some embodiments, the disclosure provides a method for treating cancer that comprises administering to a subject having or at risk of having a cancer, an effective amount of a delivery vehicle (e.g., an antibody or liposome) comprising a targeting moiety that has specific affinity for an epitope on a surface antigen of the cancer and alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the targeting moiety is an antibody or a fragment of an antibody. In additional embodiments, the delivery vehicle is a liposome. In some embodiments, the administered delivery vehicle comprises αPRTX consisting of 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In some embodiments, the disclosed compositions (e.g., liposomes containing alpha polyglutamated raltitrexed) are administered to subjects having or at risk of having a cancer, a solid tumor, and/or a metastasis that is distinguishable by the expression of a tumor specific antigen or tumor associated antigen on its cell surface. Thus, in some embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a delivery vehicle (e.g., liposome) comprising a targeting moiety and alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having a cancer, solid tumor, and/or metastasis that is distinguishable by the expression of a tumor specific antigen or tumor associated antigen on its cell surface cancer, and wherein the targeting moiety has specific binding affinity for an epitope on an tumor specific antigen or tumor associated antigen. In some embodiments, the administered delivery vehicle is a liposome. In further embodiments, the liposome is pegylated. In additional embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen expressed on the surface of a cancer, a solid tumor, and/or a metastatic cell. In additional embodiments, the targeting moiety has specific affinity for an epitope on an antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. 
     In further embodiments, the delivery vehicle is a liposome, and the liposome comprises a targeting moiety has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In further embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a delivery vehicle (e.g., an antibody or liposome) comprising a targeting moiety on its surface that has specific affinity for an epitope on an folate receptor, and an alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having a cancer that contains cells expressing the folate receptor on their cell surface. In some embodiments, the targeting moiety is an antibody, or an antigen binding fragment of an antibody. In further embodiments, the targeting moiety has specific affinity for folate receptor alpha, folate receptor beta or folate receptor delta. As disclosed herein, the folate receptor targeted pegylated liposomes containing alpha polyglutamated raltitrexed are able to deliver high quantities of alpha polyglutamated raltitrexed to cancer cells and particularly cancer cells that express folate receptors, compared to normal cells (i.e., cells that unlike cancer cells do not actively take up liposomes, and/or do not express folate receptors). Any cancers that express folate receptors may be treated according to the disclosed methods. It should be noted that some cancers may express folate receptors in an early stage while the majority of cancers may express folate receptors at late stages. In some embodiments, the administered delivery vehicle is a liposome. In further embodiments, the liposome is pegylated. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed 
     In additional embodiments, the disclosure provides a method for cancer maintenance therapy that comprises administering an effective amount of a liposomal composition comprising liposomes that contain alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject that is undergoing or has undergone cancer therapy. In some embodiments, the administered liposomal composition is a PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., PLp-αPRTX, NTPLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises a targeting moiety that has specific affinity for an epitope on a surface antigen of a cancer cell (e.g., TLp-αPRTX or TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are pegylated and targeted (e.g., TPLp-αPRTX). In some embodiments, the administered liposomal composition comprises liposomes that are targeted and liposomes that are not targeted. In some embodiments, the administered liposomal composition comprises liposomes that are pegylated and liposomes that are not pegylated. In some embodiments, liposomes of the administered liposomal composition comprise alpha polyglutamated raltitrexed that contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprise alpha hexaglutamated raltitrexed. 
     In some embodiments, the cancer treated by one or more of the methods disclosed herein is a solid tumor lymphoma. Examples of solid tumor lymphoma include Hodgkin&#39;s lymphoma, Non-Hodgkin&#39;s lymphoma, and B cell lymphoma. 
     In some embodiments, the cancer treated by one or more of the methods disclosed herein is bone cancer, brain cancer, breast cancer, colorectal cancer, connective tissue cancer, cancer of the digestive system, endometrial cancer, esophageal cancer, eye cancer, cancer of the head and neck, gastric cancer, intra-epithelial neoplasm, melanoma neuroblastoma, Non-Hodgkin&#39;s lymphoma, non-small cell lung cancer, prostate cancer, retinoblastoma, or rhabdomyosarcoma. 
     In some embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a composition comprising a delivery vehicle and alpha polyglutamated raltitrexed to a subject having or at risk of having cancer. In some embodiments, the administered composition comprises a pegylated delivery vehicle. In some embodiments, the administered composition comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a target cell of interest such as a cancer cell. In some embodiments, the delivery vehicle comprises an antibody or an antigen binding antibody fragment. In some embodiments, the composition is administered to treat a cancer selected from the group consisting of: lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, myeloma, a leukemia and a lymphoma. In some embodiments, the administered composition contains 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered composition comprises alpha tetraglutamated raltitrexed. In some embodiments, the administered composition comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered composition comprises alpha hexaglutamated raltitrexed 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposomal composition comprising liposomes that contain alpha polyglutamated raltitrexed (e.g., Lp-αPRTX, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX or TPLp-αPRTX) to a subject having or at risk of having cancer. In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, myeloma, a leukemia and a lymphoma. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., PLp-αPRTX, NTPLp-αPRTX, or TPLp-αPRTX). In some embodiments, liposomes of the administered liposomal composition comprise an αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprises alpha hexaglutamated raltitrexed. 
     In additional embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposomal composition that comprises targeted liposomes (e.g., TLp-αPRTX or TPLp-αPRTX) to a subject having or at risk of having cancer, wherein the liposomal composition comprises liposomes that comprise alpha polyglutamated raltitrexed (Lp-αPRTX) and further comprise a targeting moiety having a specific affinity for a surface antigen (epitope) on the cancer. In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: lung cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colorectal cancer, esophageal cancer, cervical cancer, liver cancer, kidney cancer, biliary duct cancer, gallbladder cancer, bladder cancer, sarcoma (e.g., osteosarcoma), brain cancer, central nervous system cancer, melanoma, myeloma, a leukemia and a lymphoma. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, liposomes of the administered liposomal composition comprise an αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprises alpha hexaglutamated raltitrexed. 
     In further embodiments, the disclosure provides a method for treating cancer that comprises administering an effective amount of a liposomal composition that contains targeted liposomes (e.g., TLp-αPRTX or TPLp-αPRTX) to a subject having or at risk of having a cancer that expresses folate receptor on its cell surface, wherein the liposomal composition comprises liposomes that comprise (a) alpha polyglutamated raltitrexed (αPRTX) and (b) a targeting moiety that has specific binding affinity for the folate receptor. In some embodiments, the administered liposomal composition comprises pegylated liposomes (e.g., TPLp-αPRTX). In some embodiments, the targeting moiety has a specific binding affinity for folate receptor alpha (FR-α), folate receptor beta (FR-β), and/or folate receptor delta (FR-δ). In some embodiments, the targeting moiety has a specific binding affinity for folate receptor alpha (FR-α), folate receptor beta (FR-β), and/or folate receptor delta (FR-δ). In some embodiments, the targeting moiety has a specific binding affinity for folate receptor alpha (FR-α) and folate receptor beta (FR-β). In some embodiments, the liposomal composition is administered to treat a cancer selected from the group consisting of: lung cancer, pancreatic, breast cancer, ovarian cancer, lung cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colon cancer, esophageal cancer, cervical cancer, kidney cancer, biliary duct cancer, gallbladder cancer, and a hematologic malignancy In some embodiments, liposomes of the administered liposomal composition comprise an αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, liposomes of the administered liposomal composition comprise alpha tetraglutamated raltitrexed. In some embodiments, liposomes of the administered liposomal composition comprise alpha pentaglutamated raltitrexed. In other embodiments, liposomes of the administered liposomal composition comprises alpha hexaglutamated raltitrexed. 
     In some embodiments, the disclosure provides a method for treating a disorder of the immune system (e.g., an autoimmune disease such as rheumatoid arthritis) that comprises administering an effective amount of a delivery vehicle (e.g., antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having a disorder of the immune system. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the administered delivery vehicle comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of an immune cell associated with a disorder of the immune system. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. In some embodiments, the autoimmune disease is rheumatoid arthritis. 
     In some embodiments, the disclosure provides a method for treating an infectious disease (e.g., HIV) that comprises administering an effective amount of a delivery vehicle (e.g., antibody or liposome) comprising alpha polyglutamated raltitrexed (e.g., an αPRTX disclosed herein) to a subject having or at risk of having an infectious disease. In some embodiments, the delivery vehicle is an antibody (e.g., a full-length IgG antibody, a bispecific antibody, or a scFv). In some embodiments, the delivery vehicle is a liposome (e.g., an Lp-αPRTX such as, PLp-αPRTX, NTLp-αPRTX, NTPLp-αPRTX, TLp-αPRTX, or TPLp-αPRTX). In some embodiments, the administered delivery vehicle is pegylated. In some embodiments, the administered delivery vehicle is not pegylated. In additional embodiments, the administered delivery vehicle comprises a targeting moiety that has a specific affinity for an epitope of antigen on the surface of a pathogen associated with an infectious disease. In some embodiments, the targeting moiety is an antibody or an antigen binding antibody fragment. In some embodiments, the administered delivery vehicle comprises αPRTX containing 4, 5, 2-10, 4-6, or more than 5, glutamyl groups. In some embodiments, the administered delivery vehicle comprises alpha pentaglutamated raltitrexed. In other embodiments, the administered delivery vehicle comprises alpha hexaglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises D alpha polyglutamated raltitrexed. In some embodiments, the administered delivery vehicle comprises L and D alpha polyglutamated raltitrexed. 
     In some embodiments, the administered delivery vehicle is a liposome. In further embodiments, the liposome is pegylated. In additional embodiments, the delivery vehicle comprises a targeting moiety on its surface that has specific affinity for an epitope on the surface of a target cell of interest. In further embodiments, the delivery vehicle comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. 
     In further embodiments, the delivery vehicle is a liposome, and the liposome comprises a targeting moiety that has specific affinity for an epitope on a cell surface antigen selected from the group consisting of: GONMB, TACSTD2 (TROP2), CEACAM5, EPCAM, a folate receptor (e.g., folate receptor-α, folate receptor-β or folate receptor-δ), Mucin 1 (MUC-1), MUC-6, STEAP1, mesothelin, Nectin 4, ENPP3, Guanylyl cyclase C (GCC), SLC44A4, NaPi2b, CD70 (TNFSF7), CA9 (Carbonic anhydrase), 5T4 (TPBG), SLTRK6, SC-16, Tissue factor, LIV-1 (ZIP6), CGEN-15027, P Cadherin, Fibronectin Extra-domain B (ED-B), VEGFR2 (CD309), Tenascin, Collagen IV, Periostin, endothelin receptor, HER2, HER3, ErbB4, EGFR, EGFRvIII, FGFR1, FGFR2, FGFR3, FGFR4, FGFR6, IGFR-1, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9, FZD10, SMO, CD2, CD3, CD4, CD5, CD6, CD8, CD11, CD11a, CD15, CD18, CD19, CD20, CD22, CD26, CD27L, CD28, CD30, CD33, CD34, CD37, CD38, CD40, CD44, CD56, CD70, CD74, CD79, CD79b, CD98, CD105, CD133, CD138, cripto, IGF-1R, IGF-2R, EphA1 an EphA receptor, an EphB receptor, EphA2, EphA3, EphA4, EphA5, EphA6, EphA7, EphA8, EphA1, EphB1, EphB2, EphB3, EphB4, EphB6, an integrin (e.g., integrin αvβ3, αvβ5, or αvβ6), a C242 antigen, Apo2, PSGR, NGEP, PSCA, TMEFF2, endoglin, PSMA, CanAg, CALLA, c-Met, VEGFR-1, VEGFR-2, DDR1, PDGFR alpha, PDGFR beta, TrkA, TrkB, TrkC, UFO, LTK, ALK, Tie1, Tie2, PTK7, Ryk, TCR, NMDAR, LNGFR, and MuSK. 
     In some embodiments, the disclosure provides for the use of a composition comprising an alpha polyglutamated raltitrexed for manufacture of a medicament for treatment of a hyperproliferative disease. In some embodiments, the alpha polyglutamated raltitrexed comprise 5 or more glutamyl groups. In some embodiments, the alpha polyglutamated raltitrexed is pentaglutamated or hexaglutamated. In some embodiments, the alpha polyglutamated raltitrexed is polyglutamated raltitrexed (RTX), raltitrexed (RTX). In some embodiments, the alpha polyglutamated raltitrexed is in a liposome. In some embodiments, the hyperproliferative disease is cancer. In some embodiments, the cancer is selected from the group consisting of: lung (e.g., non-small lung cancer), pancreatic, breast cancer, ovarian, lung, prostate, head and neck, gastric, gastrointestinal, colon, esophageal, cervical, kidney, biliary duct, gallbladder, and a hematologic malignancy. In some embodiments, the cancer is pancreatic cancer. In some embodiments, the cancer is breast cancer. In some embodiments, the cancer is pancreatic cancer. In some embodiments, the cancer is triple negative breast cancer. In some embodiments, the cancer is lung cancer. In some embodiments, the cancer is non-small cell lung cancer. In some embodiments, the cancer is leukemia or lymphoma. In some embodiments, the hyperproliferative disease is an autoimmune disease. In some embodiments, the hyperproliferative disease is rheumatoid arthritis. 
     The disclosed methods can practiced in any subject that is likely to benefit from delivery of compositions contemplated herein (e.g., alpha polyglutamated raltitrexed compositions such as liposome containing a pentaglutamated or hexaglutamated RTX). Mammalian subjects, and in particular, human subjects are preferred. In some embodiments, the subjects also include animals such as household pets (e.g., dogs, cats, rabbits, and ferrets), livestock or farm animals (e.g., cows, pigs, sheep, chickens and other poultry), horses such as thoroughbred horses, laboratory animals (e.g., mice, rats, and rabbits), and other mammals. In other embodiments, the subjects include fish and other aquatic species. 
     The subjects to whom the agents are delivered may be normal subjects. Alternatively the subject may have or be at risk of developing a condition that can be diagnosed or that can benefit from delivery of one or more of the provided compositions. In some embodiments, such conditions include cancer (e.g., solid tumor cancers or non-solid cancer such as leukemias). In some embodiments, these conditions (e.g., cancers) involve cells that express an antigen that can be specifically bound by a targeted pegylated liposomal alpha polyglutamated raltitrexed disclosed herein. In further embodiments, these antigens specifically bind and internalize the targeted pegylated liposomal alpha polyglutamated raltitrexed into the cell. In some embodiments, the targeted pegylated liposomal alpha polyglutamated raltitrexed specifically binds a folate receptor (e.g., folate receptor alpha (FR-α), folate receptor beta (FR-β) and folate receptor delta (FR-α)) expressed on the surface of the cancer cell. 
     Tests for diagnosing the conditions that can be treated with the provided compositions are known in the art and will be familiar to the medical practitioner. The determination of whether a cell type expresses folate receptors can be made using commercially available antibodies. These laboratory tests include without limitation microscopic analyses, cultivation dependent tests (such as cultures), and nucleic acid detection tests. These include wet mounts, stain-enhanced microscopy, immune microscopy (e.g., FISH), hybridization microscopy, particle agglutination, enzyme-linked immunosorbent assays, urine screening tests, DNA probe hybridization, and serologic tests. The medical practitioner will generally also take a full history and conduct a complete physical examination in addition to running the laboratory tests listed above. 
     A subject having a cancer can, for example, be a subject that has detectable cancer cells. A subject at risk of developing a cancer can, for example, be a subject that has a higher than normal probability of developing cancer. These subjects include, for instance, subjects having a genetic abnormality that has been demonstrated to be associated with a higher likelihood of developing a cancer, subjects having a familial disposition to cancer, subjects exposed to cancer causing agents (i.e., carcinogens) such as tobacco, asbestos, or other chemical toxins, and subjects previously treated for cancer and in apparent remission. 
     In some embodiments, the disclosure provides methods for selectively deliver a folate receptor targeted pegylated liposomal alpha polyglutamated raltitrexed to a tumor cell expressing a folate receptor on its surface at a rate that is higher (e.g., at least two-fold greater, at least three-fold greater, at least four-fold greater, or at least five-fold greater, than a cell not expressing folate receptor on its cell surface). In some embodiments, the delivered pegylated liposome comprises alpha polyglutamated RTX. In some embodiments, the delivered pegylated liposome comprises L-alpha polyglutamated RTX. In some embodiments, the delivered pegylated liposome comprises D-alpha polyglutamated RTX. 
     i. Combination Therapy 
     In certain embodiments, in addition to administering alpha polyglutamated RTX composition described herein, the method or treatment further comprises administering at least one additional therapeutic agent. An additional therapeutic agent can be administered prior to, concurrently with, and/or subsequently to, administration of the alpha polyglutamated RTX composition. The additional therapeutic agent can be associated with an alpha polyglutamated RTX delivery vehicle (e.g., coencapsulated with alpha polyglutamated RTX in a liposome), present in a solution containing an alpha polyglutamated RTX delivery vehicle, or in a separate formulation from the composition containing the alpha polyglutamated RTX composition. Pharmaceutical compositions comprising a polypeptide or agent and the additional therapeutic agent(s) are also provided. In some embodiments, the at least one additional therapeutic agent comprises 1, 2, 3, or more additional therapeutic agents. 
     Combination therapy with two or more therapeutic agents often uses agents that work by different mechanisms of action, although this is not required. Combination therapy using agents with different mechanisms of action may result in additive or synergetic effects. Combination therapy may allow for a lower dose of each agent than is used in monotherapy, thereby reducing toxic side effects and/or increasing the therapeutic index of the polypeptide or agent(s). Combination therapy may decrease the likelihood that resistant cancer cells will develop. In some embodiments, combination therapy comprises a therapeutic agent that affects the immune response (e.g., enhances or activates the response) and a therapeutic agent that affects (e.g., inhibits or kills) the tumor/cancer cells. 
     In some embodiments, of the methods described herein, the combination of an αPRTX compositions described herein and at least one additional therapeutic agent results in additive or synergistic results. In some embodiments, the combination therapy results in an increase in the therapeutic index of the αPRTX or agent. In some embodiments, the combination therapy results in an increase in the therapeutic index of the additional therapeutic agent(s). In some embodiments, the combination therapy results in a decrease in the toxicity and/or side effects of the αPRTX or agent. In some embodiments, the combination therapy results in a decrease in the toxicity and/or side effects of the additional therapeutic agent(s). 
     In some embodiments, in addition to administering alpha polyglutamated RTX compositions described herein, the methods or treatments described herein further comprise administering at least one additional therapeutic agent selected from: an anti-tubulin agent, an auristatin, a DNA minor groove binder, a DNA replication inhibitor, an alkylating agent (e.g., platinum complexes such as cisplatin, mono(platinum), bis(platinum) and tri-nuclear platinum complexes and carboplatin), an anthracycline, an antibiotic, an anti-folate (e.g., a polyglutamatable antifolate or a non polyglutamatable anti-folate), an antimitotic (e.g., a, a  vinca  alkaloid, such as vincristine, vinblastine, vinorelbine, or vindesine), radiation sensitizer, a steroid, a taxane, a topoisomerase inhibitor (e.g., doxorubicin HCl, daunorubicin citrate, mitoxantrone HCl, actinomycin D, etoposide, topotecan HCl, teniposide (VM-26), and irinotecan), an anti-metabolite, a chemotherapy sensitizer, a duocarmycin, an etoposide, a fluorinated pyrimidine, an ionophore, a lexitropsin, a nitrosourea, a platinol, a purine antimetabolite, a PARP inhibitor, and a puromycin. In certain embodiments, the second therapeutic agent is an alkylating agent, an antimetabolite, an antimitotic, a topoisomerase inhibitor, or an angiogenesis inhibitor. 
     Therapeutic agents that may be administered in combination with the αPRTX compositions described herein include chemotherapeutic agents. Thus, in some embodiments, the methods or treatments described herein further comprise administering at least one involves the administration of a αPRTX composition described herein in combination with a chemotherapeutic agent or in combination with a cocktail of chemotherapeutic agents. Treatment with a αPRTX composition can occur prior to, concurrently with, or subsequent to administration of chemotherapies. Combined administration can include co-administration, either in a single pharmaceutical formulation or using separate formulations, or consecutive administration in either order but generally within a time period such that all active agents can exert their biological activities simultaneously. Preparation and dosing schedules for such chemotherapeutic agents can be used according to manufacturers&#39; instructions or as determined empirically by the skilled practitioner. Preparation and dosing schedules for such chemotherapy are also described in The Chemotherapy Source Book, 4.sup.th Edition, 2008, M. C. Perry, Editor, Lippincott, Williams &amp; Wilkins, Philadelphia, Pa. 
     Chemotherapeutic agents useful in the present invention include, but are not limited to, alkylating agents such as thiotepa and cyclosphosphamide (CYTOXAN); alkyl sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines including altretamine, triethylenemelamine, trietylenephosphoramide, triethylenethiophosphaoramide and trimethylolomelamime; nitrogen mustards such as chlorambucil, chlornaphazine, cholophosphamide, estramustine, ifosfamide, mechlorethamine, mechlorethamine oxide hydrochloride, melphalan, novembichin, phenesterine, prednimustine, trofosfamide, uracil mustard; nitrosureas such as carmustine, chlorozotocin, fotemustine, lomustine, nimustine, ranimustine; antibiotics such as aclacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, calicheamicin, carabicin, caminomycin, carzinophilin, chromomycins, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, doxorubicin, epirubicin, esorubicin, idarubicin, marcellomycin, mitomycins, mycophenolic acid, nogalamycin, olivomycins, peplomycin, potfiromycin, puromycin, quelamycin, rodorubicin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin; anti-metabolites such as methotrexate and 5-fluorouracil (5-FU); folic acid analogues such as denopterin, methotrexate, pteropterin, trimetrexate; purine analogs such as fludarabine, 6-mercaptopurine, thiamiprine, thioguanine; pyrimidine analogs such as ancitabine, azacitidine, 6-azauridine, carmofur, cytosine arabinoside, dideoxyuridine, doxifluridine, enocitabine, floxuridine, 5-FU; androgens such as calusterone, dromostanolone propionate, epitiostanol, mepitiostane, testolactone; anti-adrenals such as aminoglutethimide, mitotane, trilostane; folic acid replenishers such as folinic acid; aceglatone; aldophosphamide glycoside; aminolevulinic acid; amsacrine; bestrabucil; bisantrene; edatraxate; defofamine; demecolcine; diaziquone; elformithine; elliptinium acetate; etoglucid; gallium nitrate; hydroxyurea; lentinan; lonidamine; mitoguazone; mitoxantrone; mopidamol; nitracrine; pentostatin; phenamet; pirarubicin; podophyllinic acid; 2-ethylhydrazide; procarbazine; PSK; razoxane; sizofuran; spirogermanium; tenuazonic acid; triaziquone; 2,2′,2″-trichlorotriethylamine; urethan; vindesine; dacarbazine; mannomustine; mitobronitol; mitolactol; pipobroman; gacytosine; arabinoside (Ara-C); taxoids, such as paclitaxel (TAXOL) and docetaxel (TAXOTERE); chlorambucil; gemcitabine; 6-thioguanine; mercaptopurine; platinum analogs such as cisplatin and carboplatin; vinblastine; platinum; etoposide (VP-16); ifosfamide; mitomycin C; mitoxantrone; vincristine; vinorelbine; navelbine; novantrone; teniposide; daunomycin; raltitrexed; ibandronate; CPT11; topoisomerase inhibitor RFS 2000; difluoromethylornithine (DMFO); retinoic acid; esperamicins; capecitabine (XELODA); anti-hormonal agents such as, tamoxifen, raloxifene, aromatase inhibiting 4(5)-imidazoles, 4-hydroxytamoxifen, trioxifene, keoxifene, LY117018, onapristone, and toremifene (FARESTON); anti-androgens such as flutamide, nilutamide, bicalutamide, leuprolide, and goserelin; and pharmaceutically acceptable salts, acids or derivatives of any of the above. In certain embodiments, the additional therapeutic agent is cisplatin. In certain embodiments, the additional therapeutic agent is carboplatin. In other embodiments, the additional therapeutic agent is oxaloplatin. 
     V. Kits Comprising αPRTX Compositions 
     The disclosure also provides kits that comprise the αPRTX compositions described herein and that can be used to perform the methods described herein. In certain embodiments, a kit comprises at least one purified αPRTX composition in one or more containers. 
     In some embodiments the kits include a dosage amount (e.g., as used for therapy or diagnosis) of at least one αPRTX compositions (e.g., a αPRTX liposome), or pharmaceutical formulation thereof, as disclosed herein. Kits may further comprise suitable packaging and/or instructions for use of the composition. Kits may also comprise a means for the delivery for the composition, or pharmaceutical formulation thereof, such as a syringe for injection or other device as described herein and known to those of skill in the art. One of skill in the art will readily recognize that the disclosed αPRTX compositions can be readily incorporated into one of the established kit formats which are well known in the art. 
     Further provided are kits that comprise a αPRTX compositions as well as at least one additional therapeutic agent. In certain embodiments, the second (or more) therapeutic agent is an anti-metabolite. In certain embodiments, the second (or more) therapeutic agent is a chemotherapeutic agent. 
     The following examples are intended to illustrate but not to limit the disclosure in any manner, shape, or form, either explicitly or implicitly. While they are typical of those that might be used, other procedures, methodologies, or techniques known to those skilled in the art may alternatively be used without departing from the scope of the present disclosure. 
     In some instances the antifolate pemetrexed is evaluated to determine the effect of using a polyglutamated polyglutamatable antifolate. The results obtained for pemetrexed are expected to apply equally in kind (but not necessarily equally in magnitude) to other polyglutamatable antifolates such as raltitrexed. Antifolates have been used and characterized in clinical and research settings for more than half a century, and the role of polyglutamation upon polyglutamatable antifolates in impacting cellular cytotoxicity is well understood in the art. 
       FIGS. 1B-1N  show chemical formula of exemplary alpha polyglutamates encompassed by the disclosure. 
     EXAMPLES 
     Example 1: Liposomal alpha polyglutamated Pemetrexed compositions 
     Production of Alpha Hexaglutamated Pemetrexed (αHgPMX) Liposomes 
     Briefly L alpha hexaglutamated Pemetrexed (aGR6) and D alpha hexaglutamated Pemetrexed (aDGR6) were encapsulated in liposomes by the following procedure. First, the lipid components of the liposome membrane were weighed out and combined as a concentrated solution in ethanol at a temperature of around 65° C. In this example, the lipids used were hydrogenated soy phosphatidylcholine, cholesterol, and DSPE-PEG-2000 (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy (poly-ethylene glycol)-2000]). The molar ratio of HSPC:Cholesterol:PEG-DSPE was approximately 3:2:0.15. Next, the aGR6 or aDGR6 was dissolved in 5% dextrose at a concentration of 150 mg/ml with a pH of 6.5-6.9. The drug solution was heated up to 65° C. The ethanolic lipid solution was injected into the aGR6 or aDGR6 solution using a small-bore needle. During this step the drug solution was well stirred using a magnetic stirrer. The mixing was performed at an elevated temperature (63° C.-72° C.) to ensure that the lipids were in the liquid crystalline state (as opposed to the gel state that they attain at temperatures below the lipid transition temperature Tm=51° C.-54° C.). As a result, the lipids were hydrated and form multiple bilayer (multilamellar) vesicles (MLV) containing aGR6 or aDGR6 in the aqueous core. 
     Downsizing of MLV&#39;s Using Filter Extrusion 
     The MLVs were fragmented into unilamellar (single bilayer) vesicles of the desired size by high-pressure extrusion using three passes through stacked (track-etched polycarbonate) membranes. The first pass was performed through stacked membranes consisting of two layers with a pore size of 200 nm. The remaining two passes were through the stacked membranes consisting of three layers with a pore size of 100 nm. During extrusion, the temperature was maintained above the Tm to ensure plasticity of the lipid membranes. As a result of the extrusion, large and heterogeneous in size and lamellarity MLVs turned into small, homogenous (90-125 nm) unilamellar vesicles (ULV) that sequestered the drug in their interior. A Malvern Zetasizer Nano ZS instrument (Southborough, Mass.) with back scattering detector (90°) was used for measuring the hydrodynamic size (diameter) at 25° C. in a quartz micro cuvette. The samples were diluted 50-fold in formulation matrix before analysis. 
     Purification of Liposomes 
     After the ULV&#39;s containing aGR6 or aDGR6 had been produced, the extra-liposomal free drug was removed using columns for small volume or tangential flow diafiltration against a suitable buffer for large volume. Although any buffer solution can be used, in this example the buffer used was 5 mM HEPES, 145 mM Sodium Chloride, pH 6.7. Upon completion of purification, filter sterilization was performed using a 0.22 micron filter. 
     Production of Alpha Hexaglutamated Pemetrexed (αHgPMX) Liposomes 
     Briefly L alpha hexaglutamated pemetrexed (aG6) and D alpha hexaglutamated pemetrexed (aDG6) were encapsulated in liposomes by the following procedure. First, the lipid components of the liposome membrane were weighed out and combined as a concentrated solution in ethanol at a temperature of around 65° C. In this example, the lipids used were hydrogenated soy phosphatidylcholine, cholesterol, and DSPE-PEG-2000 (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy (poly-ethylene glycol)-2000]). The molar ratio of HSPC:Cholesterol:PEG-DSPE was approximately 3:2:0.15. Next, the aG6 or aDG6 was dissolved in 5% dextrose at a concentration of 150 mg/ml with a pH of 6.5-6.9. The drug solution was heated up to 65° C. The ethanolic lipid solution was injected into the aG6 or aDG6 solution using a small-bore needle. During this step the drug solution was well stirred using a magnetic stirrer. The mixing was performed at an elevated temperature (63° C.-72° C.) to ensure that the lipids were in the liquid crystalline state (as opposed to the gel state that they attain at temperatures below the lipid transition temperature Tm=51° C.-54° C.). As a result, the lipids were hydrated and form multiple bilayer (multilamellar) vesicles (MLV) containing aG6 or aDG6 in the aqueous core. 
     Downsizing of MLV&#39;s Using Filter Extrusion 
     The MLVs were fragmented into unilamellar (single bilayer) vesicles of the desired size by high-pressure extrusion using three passes through stacked (track-etched polycarbonate) membranes. The first pass was performed through stacked membranes consisting of two layers with a pore size of 200 nm. The remaining two passes were through the stacked membranes consisting of three layers with a pore size of 100 nm. During extrusion, the temperature was maintained above the Tm to ensure plasticity of the lipid membranes. As a result of the extrusion, large and heterogeneous in size and lamellarity MLVs turned into small, homogenous (90-125 nm) unilamellar vesicles (ULV) that sequestered the drug in their interior. A Malvern Zetasizer Nano ZS instrument (Southborough, Mass.) with back scattering detector (90°) was used for measuring the hydrodynamic size (diameter) at 25° C. in a quartz micro cuvette. The samples were diluted 50-fold in formulation matrix before analysis. 
     Purification of Liposomes 
     After the ULV&#39;s containing aG6 or aDG6 had been produced, the extra-liposomal gG6 was removed using columns for small volume or tangential flow diafiltration against a suitable buffer for large volume. Although any buffer solution can be used, in this example the buffer used was 5 mM HEPES, 145 mM Sodium Chloride, pH 6.7. Upon completion of purification, filter sterilization was performed using a 0.22 micron filter. The typical characteristics of liposomal derivatives are shown in the table below. 
     
       
         
           
               
               
               
               
               
               
               
               
             
               
                   
                   
               
               
                   
                 Starting 
                 Encapsulation 
                 Final 
                 Drug/Lipid 
                   
                   
                 Zeta 
               
               
                   
                 con. 
                 efficiency 
                 con. 
                 Ratio 
                 Diameter 
                 PDI 
                 potential 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Lps aDG6 
                 1 
                 mg/ml 
                 4.75% 
                 0.031 
                 mg/ml 
                 25-30 
                 122.8 
                 nm 
                 0.021 
                 −1.14 mV 
               
               
                   
                   
                   
                   
                   
                   
                 g/mM lipids 
               
               
                 Lps aG6 
                 1 
                 mg/ml 
                 5.90% 
                 0.039 
                 mg/ml 
                 25-30 
                 100.2 
                 nm 
                 0.018 
                 −1.90 mV 
               
               
                   
                   
                   
                   
                   
                   
                 g/mM lipids 
               
               
                 LpS aG6 
                 150 
                 mg/ml 
                     36% 
                 8.0 
                 mg/ml 
                 230-260 
                 104 
                 nm 
                 0.04 
                 −2.73 mV 
               
               
                   
                   
                   
                   
                   
                   
                 g/mM Lipids 
               
               
                   
               
            
           
         
       
     
     Dose Response Study of Alpha HGP (Hexaglutamated Pemetrexed) and Liposomes 
     A dose response study was performed using liposomes containing hexaglutamated pemetrexed that were prepared essential as described above. 
     Cell viability was determined by CellTiter-Glo® (CTG) luminescent cell viability assay on Day 3 (48 hour) and Day 4 (72 hour). This assay determines the number of viable cells in culture based on quantifying ATP that is present within, which in turn signals the presence of metabolically active cells. The CTG assay uses luciferase as a readout. To assess cell viability Dose response inhibition of pemetrexed, HGP and liposomes on different cancer cell growth were investigated using CellTiter-Glo® luminescent cell viability assay. Human cancer cells were harvested, counted and plated at a same cell density on Day 0. A series of 8 dilutions of each test article were added to the cells on Day 1. Dose response curve were generated and fit using GraphPad Prism and IC50 of each test article were calculated. A lower the IC50 is, the more potent the test article is in term of cancer cell growth inhibition. 
     Cells were seeded into 96-well plate at a cell density of 5×10 4  cells per well in 100 μl of fresh media on Day 0. Eight serial 2-fold dilutions of each test article in culture medium were generated and added to cells in triplicate on Day 1. In addition, three wells of cells were treated with vehicle (HBS for free drug or empty liposome for liposomal HGP) alone as a control. 
     On Days 3 and 4, 100 μl of CellTiterGlo® Reagent were added to each well and incubated at room temperature for 15 minutes. Luciferase luminescence were recorded for each well. In addition, 8 serial 2-fold dilutions of the vehicle (HBS or empty liposome) in culture medium were added into empty wells and included in the assay to generate the background luminescence signals. Luciferase signals were normalized by subtracting the background luminescence signal out of the read-outs respectively. 
     Human Normal Primary Bone Marrow CD34+ Cells were obtained from ATCC. (ATCC Catalog Number PCS-800-012). Cells were thawed at 37° C. for 1 minute and then placed on ice. The cells were then resuspended in StemSpan SFEM (Stem Cell Tech Catalog Number 9650) plus 10% heat inactivated fetal bovine serum (Corning 35-015-CV). The cells were plated into 96 well culture plates at a density of 2.5×10 4  cells/well. The following day, live cells were collected via centrifugation and resuspended in neutrophil growth media (StemSpan SFEM plus 10% Heat Inactivated fetal bovine serum plus 100 ng/ml human stem cell factor (Sigma Catalog Number H8416), 20 ng/ml human granulocyte colony-stimulation factor (Sigma Catalog Number H5541), and 10 ng/ml human recombinant IL3 (Sigma SRP3090) at a density of 2.5×10 4  cells/well. Cells were incubated at 37° C. for 10 days. Fresh media was added every two days. Mature neutrophils were then collected and plated in 96 well plates at a density of 1×10 4  cells/well and incubated at 37° C. overnight. The next day, test article or vehicle was resuspended in neutrophil growth media and added to the plates. The cells were then incubated for either 48 hours or 72 hours at 37° C. and then assayed at each time point using the Cell Titer Glo Assay (Promega Catalog #G7572). 
     Methodologies used for cell line AML12 (non-cancerous liver cells) and CCD841 (non-cancerous colon epithelial cells) are similar to the methods used for cancer cells. 
     Results: 
     In a set of dose response experiments, 6 cell lines representing different types of cancers, namely HT-29 (colon cancer), H2342 (NSCLC, adenocarcinoma subtype), H292 (NSCLC, adenocarcinoma subtype), SW620 (CRC), H1806 (triple negative breast cancer) and OAW28 (ovarian cancer), were studied ( FIG. 2 ). Treatment consisted of exposure for 48 hours using 2 different encapsulated derivatives of liposomal alpha pemetrexed hexaglutamate, namely liposomal alpha L hexaglutamate (liposomal aG6) and its mirror image, liposomal alpha D hexaglutamate (liposomal aDG6) also referred to as its corresponding enantiomer. 
     The relative potency of the above mentioned derivatives as compared to pemetrexed, following exposure over 48 hours, is represented in  FIG. 2 . The relative potency of treatment using the various derivatives, as shown in this figure was calculated by dividing the IC50 of pemetrexed by the IC50 of the liposomal alpha pemetrexed hexaglutamate for each cell line. As shown in this figure, in all cell lines, the potency of liposomal alpha pemetrexed hexaglutamate well exceeded that of pemetrexed. By way of example, consider the NSCLC cell line H292. As shown in the figure, the potency of liposomal alpha pemetrexed hexaglutamate was ≥50-fold that of pemetrexed. This suggests that a 2% or lower dose of the liposomal alpha pemetrexed hexaglutamate could have the same treatment effect as a 100% dose of pemetrexed. 
     As stated in some instances increased uptake of payload can be achieved by targeting the liposomal delivery vehicle using antibody such as Folate Receptor Alpha. By way of example in the next two experiments Liposomal L Gamma G6/Lps Hexa gG6 was encapsulated using the methods previously described above. Subsequently, pemetrexed, liposomal gamma pemetrexed hexaglutamate derivatives (Liposomal L gamma G6/Lps Hexa gG6) and Folate Receptor Alpha Targeted Liposomal L Gamma G6 (Liposomal gG6-FR1Ab), Free (unencapsulated) L gamma G6 were tested for cytotoxic activity on representative cell lines in non-small cell lung cancer cells (NCI-H2342) and colorectal cancer cells (HT-29) as shown in  FIG. 3  and  FIG. 4  respectively. These data show that both liposomal L gamma pemetrexed hexaglutamate and Folate Receptor Alpha Targeting liposomal L gamma pemetrexed hexaglutamate are more potent than pemetrexed in both cell lines. In general Folate Receptor Alpha Antibody targeting liposomes show the highest potency. By contrast free L gamma G6 has the lowest potency due to its inability to traffic across cell membranes effectively. 
     Cancer cell viability studies comparing the liposomal alpha pemetrexed hexaglutamate derivatives (liposomal L alphaG6/Lps Hexa aG6 and liposomal D alphaG6/Lps Hexa aDG6) and pemetrexed for cytotoxic activity on representative cell lines in breast, lung and ovarian cancer are shown in  FIGS. 5-7 . These data show that both liposomal alpha L pemetrexed hexaglutamate and liposomal alpha D pemetrexed hexaglutamate are more potent than pemetrexed. Further, as an indicator of efficacy, the results of the experiments on the same cell lines depicted at various dose levels ranging from 16 to 128 nM in  FIGS. 8-10 . As shown in these figures, at each of these dose ranges, liposomal alpha L pemetrexed hexaglutamate and liposomal alpha D pemetrexed hexaglutamate are superior to pemetrexed in terms of inhibiting cancer cells for the lung and breast cancer cell lines. In the ovarian cancer cell line, pemetrexed at the dose of 128 nM, appears to be equally effective as liposomal alpha pemetrexed hexaglutamate, whereas the liposomal alpha pemetrexed hexaglutamate at the dose of 32 nM and 64 nM has a better treatment effect than pemetrexed; at 16 nM the treatment effect is lower and similar in magnitude for liposomal alpha pemetrexed hexaglutamate and pemetrexed. 
     The major toxicities seen in patients treated with pemetrexed is bone marrow suppression which manifests as a decrease in blood counts including neutrophil counts (a type of white blood cells). There is also some adverse effect on the lining of the mouth and gut that manifests as diarrhea and mucositis, as well as an adverse effect on the liver in some instances. To assess the above-mentioned toxicities, treatment of the liposomal alpha pemetrexed hexaglutamate derivatives (L and D) and pemetrexed was measured at 48 hours on CD34+ cells that were differentiated into neutrophils, CCD841 colon epithelium cells and AML12 liver cells. As shown in  FIG. 11 , liposomal alpha pemetrexed hexaglutamate is significantly less toxic to differentiating human neutrophils in contrast to pemetrexed. This is also supported by neutrophil counts that are better preserved following treatment with the liposomal alpha L pemetrexed hexaglutamate or liposomal alpha D pemetrexed hexaglutamate compared to pemetrexed, at dose ranges from 16 nM to 128 nM ( FIG. 12 ). Strikingly, there does not appear to be any toxicity to the liver cells following treatment with liposomal L alpha pemetrexed hexaglutamate or liposomal alpha D pemetrexed hexaglutamate at the dose levels studied ( FIG. 13 ). In contrast, pemetrexed at all doses studied is leading to a reduction in the liver cell counts of approximately 40%. And finally, the same trend is seen following treatment of epithelial colon cells ( FIG. 14 ). As shown in this figure, pemetrexed at all doses studied is leading to approximately a ≥50% decrease in the number of cells compared to approximately a 20% or less decrease after treatment with liposomal alpha L pemetrexed hexaglutamate and liposomal alpha D pemetrexed hexaglutamate. 
     Example 2: Polyglutamated Antifolate-Cisplatin Complexes (PGPD) 
     Methods: 
     Folate Analogues also known as antifolate have been an important anticancer treatment for the last 70 years. Used in this setting this class of anti-cancer drugs interferes with various enzymes in the important folate metabolic pathway. This can result in impaired pyrimidine and purine (DNA and RNA) synthesis, impaired amino acid glycine and serine metabolism, impaired redox response and impaired methylation processes within the cell. 
     In in clinical practice, antifolates such as pemetrexed and methotrexate are often used in combination with platinum agents such as cisplatin and carboplatin. The combinations result in enhanced efficacy. In this context, we set out to coencapsulated the polyglutamates with platinum agents in a specific ratio to facilitate controlled delivery of a predetermined ratio of the two anticancer drugs namely a polyglutamated antifolate and a platinum analogue. We surprisingly discovered that long forms of polyglutamate antifolate (e.g., pentaglutamated antifolate) forms a complex with cisplatin that is stable at high pH, and that this complex disassociates into polyglutamate and cisplatin at low pH. Low pH is believed to be occur in many tumor cells and the tumor cell environment, particularly in hypoxic settings. Application of this discovery provides the ability to facilitate the delivery of combinations of alpha polyglutamated pemetrexed (αPPMX) and therapeutic agents such as cisplatin to target cells such as tumor cells and to release the drugs from the complex in physiologically relevant low pH conditions. 
     Production of Polyglutamated Antifolates—DDAP (Cisplatin) Complexes (PGPD) 
     To produce (Polyglutamated antifolates—cisplatin DDAP Complex), alpha hexaglutamate (aG6) and Diammine dicarboxylic acid platinum (DDAP) was used. The process of complexation was dependent on the presence of Chlorinated platinum compound and pH conditions. The complexation was achieved by a nucleophilic attack on one or two carboxyl groups of glutamate by the platinate derivative. Briefly the complex was formed by the following procedure. First, the active compound DDAP was weighed and dissolved in 5% dextrose. After the DDAP dissolution step, aG6 was weighed out and added to the DDAP-Captisol® (solution and allowed to stir for 1 hour at 45-55° C. The pH of the solution was adjusted to 6.5-7.0 using 1N NaOH and the solution was stirred for 1-2 hour. The formation of complex was confirmed visually. However when the pH is adjusted to acidic pH of 3-5, the color reverted back to its original, indicating the decomplexatoin of the polyglutamated antifolate and cisplatin.  FIG. 15  depicts a schematic providing possible scenarios explaining the observed pH dependent complex formation between the polyglutamated antifolate and cisplatin. 
     Complex formation was confirmed using HPLC which showed two distinct peaks that merge into 1 large peak at high pH of 6.5 to 7.5 and then reappear at low pH of 3-5. 
     Repeating the Experiment without Captisol Showed that Complex Formation was Independent of Captisol® 
     Production of Pentaglutamated Pemetrexed-DDAP Complex (PGPD) Liposomes 
     Briefly PGPD was encapsulated in liposomes by the following procedure. First, the lipid components of the liposome membrane was weighed out and combined as a concentrated solution in ethanol at a temperature of around 65° C. In this example, the lipids used were hydrogenated soy phosphatidylcholine, cholesterol, and DSPE-PEG-2000 (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000]). The molar ratio of HSPC:Cholesterol:PEG-DSPE was approximately 3:2:0.15. Next, PGPD was prepared as described above. The PGPD drug solution was heated up to 65° C. The ethanolic lipid solution was injected into the PGPD solution using a small-bore needle. During this step the drug solution was well stirred using a magnetic stirrer. The mixing was performed at an elevated temperature (63° C.-72° C.) to ensure that the lipids were in the liquid crystalline state (as opposed to the gel state that they attain at temperatures below the lipid transition temperature Tm=51° C.-54° C.). As a result, the lipids were hydrated and formed multiple bilayer (multilamellar) vesicles (MLV) containing PGPD in the aqueous core. 
     Downsizing of MLV&#39;s Using Filter Extrusion 
     The MLVs were fragmented into unilamellar (single bilayer) vesicles of the desired size by high-pressure extrusion using two passes through stacked (track-etched polycarbonate) membranes. The stacked membranes have two layers with a pore size of 200 nm and six layers with a pore size of 100 nm. During extrusion, the temperature was maintained above the Tm to ensure plasticity of the lipid membranes. Because of the extrusion, large and heterogeneous in size and lamellarity MLVs turn into small, homogenous (100-120 nm) unilamellar vesicles (ULV) that sequester the drug in their interior. A Malvern Zetasizer Nano ZS instrument (Southborough, Mass.) with back scattering detector (90°) was used for measuring the hydrodynamic size (diameter) at 25° C. in a quartz micro cuvette. The samples were diluted 50-fold in formulation matrix before analysis. 
     Purification of Liposomes: 
     After the ULV&#39;s containing PGPD had been produced, the extra-liposomal PGPD was removed using columns for small volume or tangential flow diafiltration against a suitable buffer for large volume. Although many different buffers known in the art could have been used, in this example the buffer used was 5 mM HEPES, 145 mM Sodium Chloride, pH 6.7. Upon completion of purification, filter sterilization was performed using a 0.22-micron filter. The liposomes prepared according to the above procedures were determined to have a diameter of 116.6 nm, a PDI of 0.083, and a zeta potentials of −2.05 mV. 
     Example 3: Targeted Liposome Polyglutamated Pemetrexed Cell Delivery 
     Methods: 
     Production of Targeted Gamma Hexaglutamated Pemetrexed (HGP) Liposomes 
     Gamma HGP (gG6) was encapsulated in liposomes and the liposomes were downsized and purified according to procedures essentially as set forth above in Example 1. 
     Antibody Conjugation 
     Activated liposomes were prepared by adding DSPE-PEG-maleimide to the lipid composition. The liposomes contain four different lipids: hydrogenated soy phosphatidylcholine (HSPC), cholesterol, 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000] (DSPE-PEG-2000), and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[maleimide (polyethylene glycol)-2000] (DSPE-PEG-maleimide), in ratios of 3:2:0.1125:0.0375. 
     Antibody thiolation was accomplished through use of Traut&#39;s reagent (2-iminothiolane) to attach a sulfhydryl group onto primary amines. Antibody was suspended in PBS at a concentration of 0.9-1.6 mg/ml. Traut&#39;s reagent (14 mM) was added to antibody solution at a final concentration of 1-5 mM and then removed through dialysis after one-hour incubation at room temperature. Thiolated antibody was added to activated liposome at a ratio of 60 g/mol phosphate lipids, and the reaction mixture was incubated for one hour at room temperature and over-night at 4 uL-cysteine was used to terminate the reaction and unconjugated antibody was removed through dialysis. 
     Exemplary direct and post insertion antibody-liposome conjugation methods are provided below. 
     Exemplary Antibody Conjugation Method 1: Direct Conjugation 
     Antibody or its fragments, such as Fab or scFv, can be conjugated directly onto thiol-reactive liposome. Thiol-reactive liposomes are prepared by adding DSPE-PEG-maleimide to the lipid composition. The liposomes contain four different lipids: hydrogenated soy phosphatidylcholine (HSPC), cholesterol, 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000] (DSPE-PEG-2000), and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[maleimide (polyethylene glycol)-2000] (DSPE-PEG-maleimide), in ratios of 3:2:0.1125:0.0375. 
     Antibody (or its fragments, such as Fab or scFv) thiolation is accomplished through use of Traut&#39;s reagent (2-iminothiolane) to attach a sulfhydryl group onto primary amines. Antibody (or its fragment) is suspended in PBS at a concentration of 0.9-1.6 mg/ml. Traut&#39;s reagent (14 mM) is added to antibody (or its fragment) solution at a final concentration of 1-5 mM and then removed through dialysis after one-hour incubation at room temperature. Thiolated antibody (or its fragment) is added to thiol-reactive liposome at a ratio of 60 g/mol phosphate lipids, and the reaction mixture is incubated for one hour at room temperature and over-night at 4° C. L-cysteine is used to terminate the reaction and unconjugated antibody (or its fragment) is removed through dialysis. 
     Antibody or its fragments, such as Fab or scFv, which contains a cysteine residue at the C-terminal can be conjugated directly onto the liposome by incubating a reduced antibody (or its fragment) with thiol-reactive liposome. Antibody (or its fragment) with a cysteine tail is dissolved and reduced by a 10 −20  mM reducing reagent (such as 2-mercaptoethylamine, cysteine, or dithioerythritol) at pH&lt;7. The excess reducing reagent is removed thoroughly by size exclusion chromatography or dialysis. The purified and reduced antibody (or its fragment) can be directly conjugated to the thiol-reactive liposome. 
     Exemplary Antibody Conjugation Method 2: Post Insertion 
     Antibody or its fragments, such as Fab or scFv, which contains a cysteine residue at the C-terminal can be conjugated and incorporated into the liposome through a “post insertion” method. Micelles of thiol-reactive lipopolymer (such as DSPE-PEG-maleimide) is prepared by dissolving in an aqueous solution at 10 mg/ml. Antibody (or its fragment) with a cysteine tail is dissolved and reduced by a 10 −20  mM reducing reagent (such as 2-mercaptoethylamine, cysteine, or dithioerythritol) at pH&lt;7. The excess reducing reagent is removed thoroughly by size exclusion chromatography or dialysis. The purified and reduced antibody (or its fragment) is then incubated with the micelles of thiol-reactive lipopolymers at a molar ratio of 1:4. At the end of the reaction, the excess maleimide groups are quenched by a small amount of cysteine (1 mM) or mercaptoethanol. Unconjugated antibody (or its fragment) is removed by size exclusion chromatography. Purified conjugated micelles is then incubated with liposome at 37° C. or elevated temperature. 
     Physical Characteristics of the Nanoparticles 
       
     
       
         
           
               
               
               
               
               
               
               
               
             
               
                   
                   
               
               
                   
                 Starting 
                 Encapsulation 
                 Final 
                 Drug/Lipid 
                   
                   
                 Zeta 
               
               
                   
                 con. 
                 efficiency 
                 con. 
                 Ratio 
                 Diameter 
                 PDI 
                 potential 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Lps gG6 
                 20 mg/ml 
                 10.60% 
                 1.39 mg/ml 
                 35-50 
                 114.9 nm 
                 0.035 
                 −1.76 mV 
               
               
                   
                   
                   
                   
                 g/mM lipids 
               
               
                   
               
            
           
         
       
     
     Dose Response Study of HGP (Pentaglutamated Pemetrexed) and Liposomes. 
     Cell viability was determined by CellTiter-Glo® (CTG) luminescent cell viability assay on Day 3 (48 hour) and Day 4 (72 hour). This assay determines the number of viable cells in culture based on quantifying ATP that was present within, which in turn signals the presence of metabolically active cells. The CTG assay uses luciferase as a readout. To assess cell viability Dose response inhibition of pemetrexed, HGP and liposomes on different cancer cell growth were investigated using CellTiter-Glo® luminescent cell viability assay. Human cancer cells were harvested, counted and plated at a same cell density on Day 0. A series of 8 dilutions of each test article were added to the cells on Day 1. Dose response curve were generated and fit using GraphPad Prism and IC50 of each test article were calculated. A lower the IC50 is, the more potent the test article was in term of cancer cell growth inhibition. 
     Cells were seeded into 96-well plate at a cell density of 5×10 4  cells per well in 100 μl of fresh media on Day 0. Eight serial 2-fold dilutions of each test article in culture medium were generated and added to cells in triplicate on Day 1. In addition, three wells of cells were treated with vehicle (HBS for free drug or empty liposome for liposomal HGP) alone as a control. 
     On Days 3 and 4, 100 μl of CellTiterGlo® Reagent were added to each well and incubated at room temperature for 15 minutes. Luciferase luminescence were recorded for each well. In addition, 8 serial 2-fold dilutions of the vehicle (HBS or empty liposome) in culture medium were added into empty wells and included in the assay to generate the background luminescence signals. Luciferase signals were normalized by subtracting the background luminescence signal out of the read-outs respectively. 
     Human Normal Primary Bone Marrow CD34+ Cells were obtained from ATCC. (ATCC Catalog Number PCS-800-012). Cells were thawed at 37° C. for 1 minute and then placed on ice. The cells were then resuspended in StemSpan SFEM (Stem Cell Tech Catalog Number 9650) plus 10% heat inactivated fetal bovine serum (Corning 35-015-CV). The cells were plated into 96 well culture plates at a density of 2.5×10 4  cells/well. The following day, live cells were collected via centrifugation and resuspended in neutrophil growth media (StemSpan SFEM plus 10% Heat Inactivated fetal bovine serum plus 100 ng/ml human stem cell factor (Sigma Catalog Number H8416), 20 ng/ml human granulocyte colony-stimulation factor (Sigma Catalog Number H5541), and 10 ng/ml human recombinant IL3 (Sigma SRP3090) at a density of 2.5×10 4  cells/well. Cells were incubated at 37° C. for 10 days. Fresh media was added every two days. Mature neutrophils were then collected and plated in 96 well plates at a density of 1×10 4  cells/well and incubated at 37° C. overnight. The next day, test article or vehicle was resuspended in neutrophil growth media and added to the plates. The cells were then incubated for either 48 hours or 72 hours at 37° C. and then assayed at each time point using the Cell Titer Glo Assay (Promega Catalog #G7572). 
     Methodologies used for cell line AML12 (non-cancerous liver cells) and CCD841 (non-cancerous colon epithelial cells) are similar to the methods used for cancer cells. 
     Results: 
     The dose response relationship of free pemetrexed gamma hexaglutamate (gG6), (non-targeted) liposomal gamma hexaglutamate (liposomal gG6), pemetrexed and folate receptor alpha targeting antibody (FR1Ab) liposomal pemetrexed gamma hexaglutamate (liposomal gG6-FR1Ab), in the NCI H2342 non-small cell lung cancer (NSCLC), adenocarcinoma subtype is shown in  FIG. 3 . The output is percentage of viable cells after 48 hours of treatment as measured by luciferase luminescence. As shown in this  FIG. 3 , the free pemetrexed gG6 appears to be the least potent as measured by IC50. Both the liposomal pemetrexed gG6 and the liposomal pemetrexed gG6-FR1Ab are 7-fold and 40-fold more potent, respectively, than free pemetrexed. 
     Similar data is shown for the HT-29 colon cancer cell line in  FIG. 4  that depict cell viability expressed as a percentage. As shown in this figure, free pemetrexed gG6 appears to be the least potent. In this instance, the liposomal pemetrexed gG6 is twice as potent as pemetrexed and the liposomal pemetrexed gG6-FR1Ab is 5-fold more potent than free pemetrexed. 
     Example 4: In Vivo Studies 
     Methods: 
     Safety Studies in Mice 
     Because some of the major toxicities associated with a pemetrexed based treatment are hematologic and hepatic, it is important to evaluate the effect of Liposomal alpha G6 (Lp-aG6) in an in-vivo (murine) model and compare the changes in hematologic and the liver serum chemistry panel following treatment. To obtain this data an initial dose ranging study was conducted using healthy female BALB/c mice (6-8 weeks old) which were purchased from The Jackson Laboratory (Bar Harbor, Me.). Prior to the study, animals were weighed, randomized by weight, observed for clinical abnormalities, and distributed into groups (5 mice per group). Doses from 10 mg/kg up to 200 mg/kg were investigated to identify a tolerable dose in mice. Treatments were administrated intravenously once a week for four weeks. Body weight and detailed clinical observation were recorded daily. At the end of study, Day 28, mice were euthanized, and blood and tissue were harvested from untreated Control mice and for the mice treated with Liposomal aG6 40 mg/kg and Liposomal aG6 80 mg/kg. Whole blood was collected into K2-EDTA anticoagulant tubes for comprehensive complete blood count (CBC) and serum was isolated for comprehensive chemistry and was sent to IDEXX (Westbrook, Me.) on the day of collection. 
     Results: 
     In general, treatment with once weekly liposomal aG6 at two dose levels of 40 mg/kg and 80 mg/kg for 4 weeks was well tolerated and there were no major differences in weight compared to untreated controls. To assess some of the effects on hematologic parameters, white blood cell (WBC) counts, neutrophil counts as well as platelet counts were measured after treatment with liposomal aG6 at two dose levels of 40 mg/kg and 80 mg/kg both given once weekly for 4 weeks. As can be seen in  FIG. 16 , there were no appreciable decreases in mean neutrophil, mean white blood cell and mean platelet counts, after four weeks of treatment with Liposomal aG6 in treated animals compared to untreated control animals. Hemoglobin and reticulocyte indices were measured to assess the impact on red blood cell. As shown in  FIG. 17 , there was a minimal decrease in mean hemoglobin concentrations at the higher dose level. In parallel there is a slight increase in mean reticulocytosis indices which suggests a bone marrow&#39;s response to treatment by increasing red blood cell production. Altogether this effect seems minor as the mice hemoglobin levels are maintained after 4 weeks of treatment. Taken together these data suggest that at these dose levels, 40 mg/kg and 80 mg/kg once-weekly, there is little impact on the bone marrow and related hematologic indices. 
     Another concern with pemetrexed is hepatic toxicity that has been observed in some patients treated with pemetrexed based therapy. To assess hepatic well being in mice serum chemistries including serum aspartate transaminase (AST) and serum alanine transaminase (ALT) along with serum albumin were measured. As shown in  FIG. 18 , there were no appreciable increases in liver transaminases mean AST and mean ALT levels at 4 weeks following treatment with Liposomal aG6 at the two dose levels of 40 mg/kg and 80 mg/kg both given once weekly for 4 weeks when compared to untreated controls. There was no change in mean albumin levels either. Taken together these data suggest a favorable safety profile for Liposomal aG6. 
     Preliminary Pilot Efficacy Study in Mice Xenografts 
     To assess whether there was any tumor control following treatment with liposomal alpha pemetrexed G6 (Lp-aG6) the pilot study was conducted. In this study immunodeficient female Nude mice (Nu/J; 6-8 weeks old) were purchased from The Jackson Laboratory (Bar Harbor, Me.). NCI-H292 (Non-Small Cell Lung Cancer) cells were cultured in RPMI media supplemented with 10% Fetal Bovine Serum in a 37° C., 5% CO2 incubator. 1×10 6  cells were inoculated subcutaneously into the dorsal hind flank of each mouse. Tumor volume and body weight were monitored twice every week. Tumor-bearing mice were randomized by tumor volume on Day 0 and distributed into groups (5 mice per group): Control, pemetrexed, and Liposomal aG6. Pemetrexed was given intravenously at 167 mg/kg once every three weeks. This murine dose of 167 mg/kg every three weeks is equivalent to the FDA/EMA approved human dose and schedule of 500 mg/m 2  every three weeks. Liposomal aG6 was dosed intravenously at 80 mg/kg once a week for four weeks. Tumor size was measured with a caliper and tumor burden is calculated using the following equations: tumor volume=0.5×(tumor length)×(tumor width) 2 ; Relative tumor volume=(tumor volume/tumor volume on Day 0)×100%. This study is still ongoing but preliminary data are shown in  FIG. 19 . In this figure, relative tumor volume is displayed following treatment with Liposomal aG6 and pemetrexed. As can be seen from these preliminary data, liposomal aG6 provides better tumor control when compared to pemetrexed. 
     Further Embodiments 
     In a non-limiting embodiment, of this disclosure, there is provided a composition comprising alpha polyglutamated raltitrexed. 
     In the composition of the immediately preceding paragraph, the composition may comprise pentaglutamated or hexaglutamated raltitrexed. 
     In the composition of any of the preceding two paragraphs, the composition may comprise alpha polyglutamated raltitrexed which may include pentaglutamated or hexaglutamated raltitrexed. 
     A non-limiting example liposomal alpha polyglutamated raltitrexed (L-αPRTX) composition may comprise a composition of any of the preceding three paragraphs and the liposome may be optionally pegylated (PL-αPRTX). 
     In the L-αPRTX or PL-αPRTX composition of the immediately preceding paragraph, the alpha polyglutamated raltitrexed may include pentaglutamated or hexaglutamated raltitrexed. 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding two paragraphs, the liposome may be anionic or neutral. 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding three paragraphs, a targeting moiety may be attached to one or both of a PEG and the exterior of the liposome, and the targeting moiety may have a specific affinity for a surface antigen on a target cell of interest (TL-αPRTX or TPL-αPRTX). 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding four paragraphs, a targeting moiety may be attached to one or both of a PEG and the exterior of the liposome and may be a polypeptide. 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding five paragraphs, a targeting moiety may be attached to one or both a PEG and the exterior of the liposome and may be an antibody or a fragment of an antibody. 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding six paragraphs, one or more of an immunostimulatory agent, a detectable marker and a maleimide may be disposed on at least one of a PEG and the exterior of the liposome. 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding seven paragraphs, a polypeptide may bind an antigen with an equilibrium dissociation constant (Kd) in a range of 0.5×10 −10  to 10×10 −6  as determined using BIACORE® analysis. 
     In the L-αPRTX or PL-αPRTX composition of any of the preceding eight paragraphs, a polypeptide may specifically bind one or more folate receptors selected from the group consisting of: folate receptor alpha (FR-α), folate receptor beta (FR-β), and folate receptor delta (FR-δ). 
     A non-limiting exemplary method of killing a hyperproliferative cell that includes contacting a hyperproliferative cell with a liposomal alpha polyglutamated raltitrexed composition of any of the preceding nine paragraphs. 
     In the method of the immediately preceding paragraph, the hyperproliferative cell is a cancer cell. 
     A non-limiting example method for treating cancer comprises administering an effective amount of the alpha polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph eleven to preceding paragraph three, to a subject having or at risk of having cancer. 
     In the method of the immediately preceding paragraph, the cancer may be one or more selected from the group consisting of: lung cancer, pancreatic, breast cancer, ovarian cancer, lung cancer, prostate cancer, head and neck cancer, gastric cancer, gastrointestinal cancer, colon cancer, esophageal cancer, cervical cancer, kidney cancer, biliary duct cancer, gallbladder cancer, and a hematologic malignancy. 
     A non-limiting example maintenance therapy for subjects that are undergoing or have undergone cancer therapy includes administering an effective amount of the alpha polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph thirteen to preceding paragraph five, to a subject that is undergoing or has undergone cancer therapy. 
     A non-limiting example pharmaceutical composition may include any alpha polyglutamated raltitrexed composition of Section IV. 
     A non-limiting example method for treating a disorder of the immune system may include administering an effective amount of the of the alpha polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph fourteen to preceding paragraph six, to a subject having or at risk of having a disorder of the immune system. 
     A non-limiting example method for treating an infectious may include comprises administering an effective amount of the of the alpha polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph fifteen to preceding paragraph seven, to a subject having or at risk of having an infectious disease. 
     A non-limiting example method of delivering alpha polyglutamated raltitrexed to a tumor expressing a folate receptor on its surface may include administering a polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph sixteen to preceding paragraph eight, to a subject having the tumor in an amount to deliver a therapeutically effective dose of the alpha polyglutamated raltitrexed to the tumor. 
     A non-limiting example method of preparing a liposomal alpha polyglutamated raltitrexed composition which includes alpha polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph seventeen to preceding paragraph nine includes forming a mixture comprising: liposomal components; alpha polyglutamated raltitrexed in solution; homogenizing the mixture to form liposomes in the solution; and processing the mixture to form liposomes containing the polyglutamated raltitrexed. 
     A non-limiting example pharmaceutical composition includes an alpha polyglutamated raltitrexed composition of any of preceding paragraphs from preceding paragraph eighteen to preceding paragraph ten. 
     Although the disclosure has been described with reference to various some embodiments, it should be understood that various modifications can be made without departing from the spirit of the disclosure. Accordingly, the scope of the disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. Throughout this application, various publications are referenced by author name and date, or by patent No. or patent Publication No. The disclosure of these publications are hereby incorporated in their entireties by reference into this application in order to more fully describe the state of the art as known to those skilled therein as of the date of the invention described and claimed herein. However, the citation of a reference herein should not be construed as an acknowledgement that such reference is prior art to the present invention. 
     Various new chemical entities, methods and equipment for making these chemical entities are set forth below in the appended claims. 
     It is to be appreciated that the Detailed Description section, and not the Summary and Abstract sections, is intended to be used to interpret the claims. The Summary and Abstract sections may set forth one or more but not all exemplary embodiments, of the present invention as contemplated by the inventor(s), and thus, are not intended to limit the present invention and the appended claims in any way. 
     The disclosure of each of U.S. Appl. No. 62/627,703, filed Feb. 7, 2018; U.S. Appl. No. 62/627,714, filed Feb. 7, 2018; U.S. Appl. No. 62/627,716, filed Feb. 7, 2018; U.S. Appl. No. 62/627,731, filed Feb. 7, 2018; U.S. Appl. No. 62/627,741, filed Feb. 7, 2018; U.S. Appl. No. 62/630,629, filed Feb. 14, 2018; U.S. Appl. No. 62/630,634, filed Feb. 14, 2018; U.S. Appl. No. 62/630,637, filed Feb. 14, 2018; U.S. Appl. No. 62/630,671, filed Feb. 14, 2018; U.S. Appl. No. 62/630,713, filed Feb. 14, 2018; U.S. Appl. No. 62/630,728, filed Feb. 14, 2018; U.S. Appl. No. 62/630,744, filed Feb. 14, 2018; U.S. Appl. No. 62/630,820, filed Feb. 14, 2018; U.S. Appl. No. 62/630,825, filed Feb. 14, 2018; U.S. Appl. No. 62/636,294, filed Feb. 28, 2018; U.S. Appl. No. 62/662,374, filed Apr. 25, 2018; U.S. Appl. No. 62/702,732, filed Jul. 24, 2018; U.S. Appl. No. 62/702,561, filed Jul. 24, 2018; U.S. Appl. No. 62/764,943, filed Aug. 17, 2018; and U.S. Appl. No. 62/764,955, filed Aug. 17, 2018; is herein incorporated by reference in its entirety.