# Patent

## Title
Immunogenic polypeptide cocktail for the treatment of medullary thyroid carcinoma

## Abstract

Disclosed are immunogenic compositions that include one or more polypeptides that, when administered to a subject with adjuvant, elicit an immune response against medullary thyroid cancer. Disclosed are methods of eliciting an immune response and/or treating cancer, such as medullary thyroid carcinoma or other thyroid carcinomas.

## Background
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority benefit of the earlier filing date of U.S. Provisional Application No. 62/299,941, filed Feb. 25, 2016, which is hereby incorporated herein by reference in its entirety.


TECHNICAL FIELD
Embodiments herein relate to treatments for cancer, and more specifically to a multivalent polypeptide/oligonucleotide cocktail for eliciting an immune response to medullary thyroid carcinoma and other solid tumors.
BACKGROUND
Medullary Thyroid Carcinoma (MTC) is a rare malignancy originating from the calcitonin-secreting C cells of the thyroid. Unlike its much more common counterpart, papillary thyroid carcinoma, there is currently no known cure for metastatic MTC, which is not radioiodine avid. Common sites of metastases include the lungs, liver and bones. Among other factors, prognosis depends on disease stage and tumor growth rate, as monitored by the doubling times of serum tumor markers calcitonin and carcinoembryonic antigen (CEA). For patients with distant metastases, the 10 year survival rate is estimated to be 20-40%.
There is no effective adjuvant therapy for early stage MTC, which is commonly resistant to traditional cytotoxic chemotherapy regimens due to slow cytokinetic growth and intrinsic molecular factors, which inhibit apoptosis. Currently available systemic therapies for MTC produce only partial and transient responses, and are limited to use in patients with advanced or rapidly progressing disease. There are currently two FDA-approved targeted molecular therapies for MTC, the multi-kinase inhibitors vandetanib and cabozantinib. In Phase III clinical trials, both drugs improved progression-free survival, but failed to significantly extend overall survival. In fact, for patients lacking RET mutations, cabozantinib reduced median survival by several months. In the hundreds of patients treated in both trials, there were no documented complete responses and investigators deemed several fatalities to be treatment related. The vast majority of patients experienced grade 3 or grade 4 adverse events, including diarrhea, hypertension, desquamation, fatigue and fistulas. Due to harsh side effects, clinical use of both drugs is generally limited to patients with advanced and symptomatic disease. As current treatment regimens are inadequate and impact quality of life, there is a significant unmet clinical need for novel therapies to treat metastatic MTC.



BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments will be readily understood by the following detailed description in conjunction with the accompanying drawings and the appended claims. Embodiments are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings.
FIG. 1 is a bar graph showing the concentration of interleukin-6 (IL-6) secreted by dendritic cells after 48 hour exposure to various TLR agonists.
FIG. 2 is a bar graph showing CD80 expression by human dendritic cells primed by various TLR agonists.
FIG. 3 is a bar graph showing CD86 expression by human dendritic cells primed by various TLR agonists.
FIG. 4 is a plot demonstrating tumor growth inhibition in a murine syngeneic tumor model of MTC by a disclosed immunogenic composition
FIG. 5 is a bar graph of murine ELISPOT data which characterizes the immune response to the epitope TNLSTCML in both treatment and control groups
FIG. 6 is a bar graph of murine ELISPOT data which characterizes the immune response to the epitope RIPVKWTAI in both treatment and control groups



DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS
In the following detailed description, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration embodiments that may be practiced. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of embodiments is defined by the appended claims and their equivalents.
Various operations may be described as multiple discrete operations in turn, in a manner that may be helpful in understanding embodiments; however, the order of description should not be construed to imply that these operations are order dependent.
For the purposes of the description, a phrase in the form “A/B” or in the form “A and/or B” means (A), (B), or (A and B). For the purposes of the description, a phrase in the form “at least one of A, B, and C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C). For the purposes of the description, a phrase in the form “(A)B” means (B) or (AB) that is, A is an optional element.
The description may use the terms “embodiment” or “embodiments,” which may each refer to one or more of the same or different embodiments. Furthermore, the terms “comprising,” “including,” “having,” and the like, as used with respect to embodiments, are synonymous, and are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.).
With respect to the use of any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
Unless otherwise noted, technical terms are used according to conventional usage. Definitions of common terms in molecular biology can be found in Benjamin Lewin, Genes IX, published by Jones and Bartlet, 2008 (ISBN 0763752223); Kendrew et al. (eds.), The Encyclopedia of Molecular Biology, published by Blackwell Science Ltd., 1994 (ISBN 0632021829); and Robert A. Meyers (ed.), Molecular Biology and Biotechnology: a Comprehensive Desk Reference, published by VCH Publishers, Inc., 1995 (ISBN 9780471185710); and other similar references.
Suitable methods and materials for the practice or testing of this disclosure are described below. Such methods and materials are illustrative only and are not intended to be limiting. Other methods and materials similar or equivalent to those described herein can be used. For example, conventional methods well known in the art to which this disclosure pertains are described in various general and more specific references, including, for example, Sambrook et al., Molecular Cloning: A Laboratory Manual, 2d ed., Cold Spring Harbor Laboratory Press, 1989; Sambrook et al., Molecular Cloning: A Laboratory Manual, 3d ed., Cold Spring Harbor Press, 2001; Ausubel et al., Current Protocols in Molecular Biology, Greene Publishing Associates, 1992 (and Supplements to 2000); Ausubel et al., Short Protocols in Molecular Biology: A Compendium of Methods from Current Protocols in Molecular Biology, 4th ed., Wiley & Sons, 1999; Harlow and Lane, Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press, 1990; and Harlow and Lane, Using Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press, 1999. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.
I. Introduction
A strategy for improving treatment of MTC, and other cancers, is to provoke a robust and targeted immune response against cancer cells, for example by administration of an immunogenic composition that elicits an immune response against the cancer cells. The aim of the administration is to reprogram the host's immune system to eradicate cells expressing specific antigen fragments associated with cancer gene expression. Such antigens may include either tissue restricted antigens, i.e. antigens which are exclusively expressed or overexpressed in a given tissue or tumor mutation specific antigens.
Disclosed herein is a novel therapeutic immunogenic composition (which can be referred to herein as MeddieVax) for the treatment of MTC and other human tumors, which may express some or all of the antigens targeted by the immunogenic composition. Also disclosed are methods of treatment using this immunogenic composition as well as methods of making the immunogenic composition.
As disclosed herein, an immunogenic composition includes a novel cocktail of immunogenic polypeptides and adjuvants. This immunogenic composition has been designed to promote a robust immune response against proteins expressed in cancer cells. In addition, the immunogenic composition was designed to address several of the known mechanisms of immune escape, and thereby overcome the deficiencies of previously trialed cancer vaccines.
A. Cancer Biology and Mechanisms of Immune Escape
It has been recognized that tumors can progress due to the failure of the host's immune system to eradicate genetically altered cells which express gene products with mutated polypeptide sequences. These consequential genes, often referred to as oncogenes and tumor suppressor genes, are involved in numerous cellular functions, including DNA damage repair, cell-cycle regulation, proliferation, motility and survival.
The human immune system has sophisticated cellular machinery which can eliminate cells expressing mutated, “non-self” proteins or alternately cells expressing “self” proteins, in a classical autoimmune paradigm. Under normal conditions, nucleated cells routinely present intracellular polypeptide antigen fragments on their membranes which are bound to MHC class I (major histocompatibility complex class I) molecules. This process allows a continuous sampling of the intracellular protein content by patrolling cytotoxic T cells.
MHC class I-restricted epitopes are polypeptide chains comprised of approximately 9 amino acids, which bind with sufficient avidity to MHC class I. Thus, MHC class I molecules, in general, are capable of presenting 209=512 billion possible epitopes. However, only a fraction of these possible epitopes become bona fide epitopes due to HLA restriction. The chemical stability of the MHC I/peptide interaction, as measured by binding affinity, is highly variable, depending on the exact peptide sequence and the host's particular human leukocyte antigen (HLA) alleles. Assuming that a peptide epitope binds with sufficient affinity to a cell's MHC I molecule, it can be transported to the cell surface and presented to patrolling cytotoxic T cells. When a MHC I-bound epitope is presented to a cytotoxic (CD8) T cell, an epitope/MHC/T cell receptor (TCR) complex may be formed. If the epitope/MHC complex binds with sufficient affinity to the TCRs of the activated (non-naïve) T cell, the T cell may be triggered to eradicate the epitope-presenting cell. Under certain conditions, the epitope-presenting cell may be a cancer cell presenting cancer-associated epitopes, and the T cell may be activated cytotoxic T cell. It has been estimated that in a given second, 150 different epitopes are loaded onto a cell's MHC class I molecules. This process enables a vast amount of cellular protein proofreading to occur throughout the course of a single day.
Of note, cytotoxic T cells must first be activated, in order to destroy cells expressing their cognate antigen(s). Prior to activation, T cells are considered naïve, and unable to execute cytolytic functions. Anti-tumoral T cell activation is thought to occur during a process known as cross-priming, whereby dendritic cells or other profession antigen presenting cells (APCs) simultaneously uptake complexed tumor antigens and activating signaling molecules, generically known as PAMPs (pathogen activating molecular patterns) or DAMPs (damage activating molecular patterns). One important class of PAMPs are toll-like receptor (TLR) agonists, including those which activate TLR-2, TLR-7, TLR-8 and TLR-9. The function of the adjuvant is provide such activating signaling molecules to the dendritic cells, in order to promote T cell activation.
The human body is constantly exposed to environmental mutagens from naturally occurring compounds, synthetic chemicals and ionizing radiation from nuclear isotopes and cosmic rays. Furthermore, the process of DNA replication is imperfect. It takes only a few mutations in a single cell to initiate tumor formation. The average human has 37.2 trillion cells and the nucleus of each somatic cell holds an estimated 3.2 billion base pairs. Indeed, a typical human harbors 2.34×1023 DNA base pairs. Of this mathematically profound genomic library, as few as two point mutations in the entire genome can initiate tumorigenesis. In light of known mutation rates, it is conceivable that the redundancy inherent to the human immune system alongside cellular apoptosis mechanisms prevents a very large number of cancers from forming by eradicating corrupted cells early in the process of tumorigenesis.
On occasion, mutated cells are able to evade immune surveillance and begin the process of tumorigenesis. Via the combined processes of immunoediting and clonal evolution, cancer cells may evade immune eradication by employing several escape mechanisms. A list of six potential escape mechanisms is enumerated as follows.
1. The cancer cells may express weakly immunogenic antigens by virtue of having mutations in epitope regions exhibiting weak MHC I binding affinity as dictated by the host's unique HLA complex. Due to weak MHC binding affinity, mutations in these “immunogenic blind spots” are allowed to persevere without immune clearance, as they are not efficiently presented to cytotoxic T cells by MHC I molecules.
2. The cancer cells may fail to present potential epitopes to cytotoxic T cells via complete or partial loss of MHC I expression, which among other factors, can result from mutations or deletions in genes required for MHC I expression, such as β-2 microglobulin.
3. Initially responsive cytotoxic T cells may become anergic due to interactions with regulatory T cells. Dendritic cells are known to activate clonal expansion of regulatory T cells when potential epitopes are presented in the absence of other immune-stimulating PAMPs and/or DAMPs.
4. Tumor cells are proteomically heterogeneous. T cell clones capable of killing tumor cells expressing a particular epitope will leave behind a contingent of tumor cells which fail to express the targeted epitope.
5. The tumor environment is immunosuppressive, as cancer cells often express inhibitory molecules such as PD-L1, synthesize enzymes such as Indoleamine 2,3-dioxygenase (IDO) or cytokines such as TGF-β and IL-10 which are all known to suppress effector T cells.
6. Cancer cells may upregulate tolerogenic proteins, such as HLA-E, in order to avoid destruction of NK cells, while simultaneously avoiding T cell-mediated destruction by failing to express and present antigens via classical MHC I complexes (HLA-A, HLA-B and HLA-C).
Despite knowledge of tumor immune escape mechanisms, many vaccines have not been designed with countermeasures against these escape mechanisms. As a prime example, it is not uncommon for existing cancer vaccines to target just a single antigen, such as NY-ESO-1, MAGE-3, survivin or CEA, which permits immune escape via escape mechanism #4. As a second example, many cancer vaccines are designed to only target MHC I epitopes by virtue of vaccinating with short (9-10 amino acid) epitope fragments when it is known that longer ( ̃15 amino acid) epitope fragments are required for MHC II presentation, which primes CD4+ helper T cells. CD4+ T helper cells play an essential role in activating both B cells, licensing dendritic cells to prime naive CD8+ T cells and assisting in the formation of memory T cells. Given the profound immune suppression routinely observed in AIDS patients with low CD4+ helper T cell counts, the importance of designing a vaccine, which also activates CD4+ cells, should not be overlooked. Short epitopes, which can only be presented by MHC I molecules, permit immune escape via mechanism #2. In recent years, numerous cancer vaccines, particularly those employing short peptide epitopes, have failed in Phase III clinical trials, as their designs have failed to induce robust and durable immune responses.
The impetus for this disclosure is to improve the efficacy of vaccination therapy for human cancer. Thus, disclosed herein are novel immunogenic compositions, also called MeddieVax, for the treatment of MTC and other human solid tumors harboring the targeted antigens. The disclosed immunogenic compositions have been designed with countermeasures against several immune escape mechanisms. Although this disclosure has particular relevance to MTC, the compositions and methods disclosed herein can be applied to other human cancers, such as human cancers which express the same antigens. In certain embodiments, a disclosed novel immunogenic composition is a vaccine, such as a vaccine for the treatment of MTC and other human solid tumors harboring the targeted antigens.
B. Targeting MTC-Associated Proteins with Immunogenic Epitopes
To be effective, a therapeutic cancer vaccine should elicit a robust immune response against tumor-associated antigens or mutation-derived tumor-specific antigens. To guide selection of target proteins, publicly-available mRNA expression databases were mined in conjunction with a comprehensive literature review to determine viable protein targets. Upon identification of protein targets, the UniProtKP online database was accessed to identify the canonical amino acid sequences for each target protein. Then a number of epitope prediction algorithms were employed to identify specific polypeptide sequences containing epitopes with strong binding affinity for both MHC Class I and MHC Class II molecules, as strong binding is a prerequisite for immunogenicity. In certain instances, epitopes were modified by conservative amino acid substitutions to further enhance predicted MHC binding affinity. Polypeptides were also selected for their predicted ability to serve as B cell epitopes, which is required for antibody production. The novel polypeptide cocktail component of MeddieVax was designed using a comprehensive approach, which was informed by mRNA sequencing, multiple epitope prediction algorithms and immunohistochemical characterization of MTC tumors. As a countermeasure against escape mechanism #4, MeddieVax is designed to provoke a targeted immune response against multiple antigens.
The polypeptide component of MeddieVax establishes antigen targets for immune destruction, but polypeptides alone are insufficiently immunogenic. In fact, when presented without the appropriate stimulatory danger signals (PAMPs), polypeptides can actually promote immune tolerance via induction of regulatory T cells. To elicit a robust immune response, polypeptide vaccines use an adjuvant. In some embodiments, MeddieVax contains a novel adjuvant formulation, which has been empirically verified to prime dendritic cells to secrete immunogenic cytokines and express key surface stimulatory molecules, which are essential to initiating adaptive immune responses. Importantly, the peptides are designed to complex with the adjuvants to enhance production of various cytokines associated with antitumoral immune responses.
On occasion, medullary thyroid carcinomas exhibit a mixed medullary-follicular phenotype. Thus in some embodiments, the compositions and methods disclosed herein are suited for the treatment of medullary thyroid carcinomas having a mixed medullary-follicular phenotype or for well-differentiated thyroid carcinomas or the papillary and follicular kind.
II. Description of Several Embodiments
A. Immunogenic Compositions
Disclosed are immunogenic compositions specifically designed to target tumor associated antigens, and in particular, antigens associated with medullary thyroid carcinoma, papillary thyroid carcinoma and follicular thyroid carcinoma. Although the present disclosure emphasizes medullary thyroid carcinoma, the compositions disclosed herein can also be used in other cancers, for example solid tumors, such as sarcomas and carcinomas, including fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma and other sarcomas, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, colon cancer (such as colon carcinoma), gastric cancer, (for example, gastric adenocarcinoma, such as intestinal type gastric adenocarcinoma and diffuse type gastric adenocarcinoma), lymphoid malignancy, pancreatic cancer, breast cancer (such as adenocarcinoma), lung cancers, gynecological cancers (such as cancers of the uterus (for example endometrial carcinoma), cervix (for example cervical carcinoma, pre-tumor cervical dysplasia), ovaries (for example, ovarian carcinoma, serous cystadenocarcinoma, mucinous cystadenocarcinoma, endometrioid tumors, celioblastoma, clear cell carcinoma, unclassified carcinoma, granulosa-thecal cell tumors, Sertoli-Leydig cell tumors, dysgerminoma, malignant teratoma), vulva (for example squamous cell carcinoma, intraepithelial carcinoma, adenocarcinoma, fibrosarcoma, melanoma), vagina (for example clear cell carcinoma, squamous cell carcinoma, botryoid sarcoma), embryonal rhabdomyosarcoma and fallopian tubules (for example carcinoma), prostate cancer, hepatocellular carcinoma, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, analplastic thyroid carcinoma, pheochromocytomas, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile duct carcinoma, choriocarcinoma, Wilms' tumor, cervical cancer, testicular tumor, seminoma, bladder carcinoma and CNS tumors (such as a glioma, astrocytoma, medulloblastoma, craniopharyogioma, ependymoma, pinealoma, hemangioblastoma, acoustic neuroma, oligodendroglioma, menangioma, melanoma, neuroblastoma and retinoblastoma) and skin cancer (such as melanoma and non-melanoma).
On occasion, medullary thyroid carcinomas exhibit a mixed medullary-follicular phenotype, expressing both thyroglobulin and thyroid peroxidase (TPO), which are normally expressed in papillary and follicular thyroid carcinomas. As both thyroglobulin and TPO are highly expressed and likely exclusively expressed in the thyroid, they function as viable targets for therapeutic vaccination. In some embodiments, the disclosed compositions are designed to target tumors expressing thyroglobulin and/or TPO.
An immunogenic composition, such as disclosed herein is composition useful for stimulating or eliciting a specific immune response (or immunogenic response) in a vertebrate. In some embodiments, the immunogenic response is protective or provides protective immunity against cancer. One specific example of a type of immunogenic composition is a vaccine. For in vitro use, the immunogenic composition can consist of the isolated nucleic acid, vector including the nucleic acid/or immunogenic polypeptide. For in vivo use, the immunogenic composition will typically comprise immunogenic polypeptide(s) and/or the nucleic acids encoding the immunogenic polypeptide(s), such as a vector including the nucleic acid, in pharmaceutically acceptable carriers, and/or other agents. An immunogenic composition can optionally include an adjuvant. The disclosed immunogenic compositions include one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to one or more of RET, HRAS, KRAS, BRAF, calcitonin, carcinoembryonic antigen (CEA), MUC1, MUC4, NY-ESO-1, survivin, indoleamine 2,3-dioxygenase (IDO), HLA-G, brachyury, thyroglobulin, and/or thyroid peroxidase (TPO), and/or mutant forms thereof, such as 2 or more, 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, 10 or more, 11 or more, or 12 or more, 13 or more, 14 or more, or even all 15 of RET, HRAS, KRAS, BRAF, calcitonin, carcinoembryonic antigen (CEA), MUC1, MUC4, NY-ESO-1, survivin, indoleamine 2,3-dioxygenase (IDO), HLA-G, brachyury, thyroglobulin, and/or TPO, and/or mutant forms thereof. In some embodiments, the polypeptides are non-HLA restricted. In some embodiments the polypeptides are HLA restricted, such as HLA-A24, HLA-A1 and HLA-A2 restricted.
In embodiments, an isolated polypeptide that elicits an immune response to a RET polypeptide comprises consists essentially of, and/or consists of, the amino acid sequence set forth as QGRIPVKWTAIESLFDHIYTT (SEQ. ID NO: 2), RENRPPGTFHQFRLLPVQFLCPNISVAYRL (SEQ. ID NO: 3), PX1KWTAIEX2 (SEQ. ID NO: 4), where X1 is Y or T and X2 is Y or I (such as PYKWTAIEI (SEQ. ID NO: 5) or PTKWTAIEY (SEQ. ID NO: 6)), or RLPVKWTAL (SEQ. ID NO: 7). In some embodiments, the sequence set forth as SEQ ID NO: 4 comprises, consists essentially of, and/or consists of, SEQ ID NO: 5 or 6. In some embodiments, an immunogenic composition includes one or more of the polypeptides having the amino acid sequence set forth as one of SEQ ID NOS: 2-7, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to an HRAS polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as DGETCLLDILDTAGX1EEYSAMRDQYMRTG (SEQ. ID NO: 11), where X1 can be R or K (such as DGETCLLDILDTAGREEYSAMRDQYMRTG (SEQ. ID NO: 12) or DGETCLLDILDTAGKEEYSAMRDQYMRTG (SEQ. ID NO: 13)), MTEYKLWVGAGRVGKSALTIQLIQ (SEQ. ID NO: 14), or VKDSDDVPMVLVGNNCDLAARTVESRQAQ (SEQ. ID NO: 15). In some embodiments, the sequence set forth as SEQ ID NO: 11 comprises, consists essentially of, and/or consists of, SEQ ID NO: 12 or 13. In some embodiments, an immunogenic composition includes one or more of the polypeptides having the amino acid sequence set forth as one of SEQ ID NOS: 11-15, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to a KRAS polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as DLARSYGIPFIETSVKTRQRVEDAFYTLV (SEQ. ID NO: 16) or MTEYKLVVVGAX1GVGKSALTIQL (SEQ. ID NO: 17) where X1 can be V or R (such as MTEYKLVWGAVGVGKSALTIQL (SEQ. ID NO: 18) or MTEYKLVWGARGVGKSALTIQL (SEQ. ID NO: 19)). In some embodiments, the sequence set forth as SEQ ID NO: 17 comprises, consists essentially of, and/or consists of, SEQ ID NO: 18 or 19. In some embodiments, an immunogenic composition includes one or more of the polypeptides having the amino acid sequence set forth as one of SEQ ID NOS: 16-19, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to a BRAF polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as EDLTVKIGDFGLATX1KSRWSGSHQFEQL (SEQ. ID NO: 20), where X1 can be E or K (such as EDLTVKIGDFGLATEKSRWSGSHQFEQL (SEQ. ID NO: 21), or EDLTVKIGDFGLATKKSRWSGSHQFEQL (SEQ. ID NO: 22)), or GX1ATX2KSRX3 (SEQ. ID NO: 23) where X1=T, L or Y, X2=E or K, and X3=Y, L, or F (such as (GTATX2KSRY (SEQ. ID NO: 24), where X2=E or K, GLATX2KSRL (SEQ. ID NO: 25), where X2=E or K, or GYATX2KSRF (SEQ. ID NO: 26), where X2=E or K). In some embodiments, the sequence set forth as SEQ ID NO: 20 comprises, consists essentially of, and/or consists of, SEQ ID NO: 21 or 22. In some embodiments, the sequence set forth as SEQ ID NO: 23 comprises, consists essentially of, and/or consists of, SEQ ID NO: 24, 25, or 26. In some embodiments, an immunogenic composition includes one or more of the polypeptides having the amino acid sequence set forth as one of SEQ ID NOS: 20-26, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to a calcitonin polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as CTNLSTCMLGTYTQDFNKFHTFPQTAIGVAAP (SEQ ID NO: 28). In some embodiments, an immunogenic composition includes one or more polypeptides having the amino acid sequence set forth as SEQ. ID NO: 28. In embodiments, an isolated polypeptide that elicits an immune response to a CEA polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as TYACFVSNLATGRNNSIVKSITVSASGTSP (SEQ. ID NO: 30), LIQNIIQNDTGFYTLHVIKSDLVNEEAT (SEQ. ID NO: 31), or ITEKNSGLY (SEQ. ID NO: 32). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as one of SEQ ID NOS: 30-32, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to a MUC1 polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as QRDISEMFLQIYKQGGFLGLSNIKFRPGSVVV (SEQ. ID NO: 35). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as SEQ ID NO: 35. In embodiments, an isolated polypeptide that elicits an immune response to a MUC4 polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as ESDYQIFSYPNPLPSGFT (SEQ. ID NO: 36). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as SEQ ID NO: 36. In embodiments, an isolated polypeptide that elicits an immune response to a NY-ESO-1 polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as GPESRLLEFYLAMPFATPMEAELARRSLAQ (SEQ. ID NO: 38). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as SEQ ID NO: 38. In embodiments, an isolated polypeptide that elicits an immune response to a survivin polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as AFLSVKKQFEELX1LGEFLKX2DRERAKNKIA (SEQ. ID NO: 40), where X1=T, or Y, and X2=L, Y or I (such as AFLSVKKQFEELTLGEFLKLDRERAKNKIA (SEQ. ID NO: 41), AFLSVKKQFEELTLGEFLKYDRERAKNKIA (SEQ. ID NO: 42), AFLSVKKQFEELTLGEFLKIDRERAKNKIA (SEQ. ID NO: 43), or AFLSVKKQFEELYLGEFLKLDRERAKNKIA (SEQ. ID NO: 44)). In some embodiments, the sequence set forth as SEQ ID NO: 40 comprises, consists essentially of, and/or consists of, SEQ ID NOS: 41, 42, 43, or 44. In some embodiments, an immunogenic composition includes one or more of the polypeptides having the amino acid sequence set forth as one of SEQ ID NOS: 40-44, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to an IDO polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as PRNIAVPYCQLSKKLELPPILVYADCVLAN (SEQ. ID NO: 46). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as SEQ ID NO: 46. In embodiments, an isolated polypeptide that elicits an immune response to a HLA-G polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as QTDRLNLQTLRGYYN (SEQ. ID NO: 48). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as SEQ ID NO: 48. In embodiments, an isolated polypeptide that elicits an immune response to a brachyury polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as KLNGGGQIMLNSLHKYEPRIHIVRVGGPQR (SEQ. ID NO: 50). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as SEQ ID NO: 50. In embodiments an immunogenic composition further includes a polypeptide that, when administered to a subject, elicits an immune response to a mutant passenger protein, the polypeptide comprising, consists essentially of, and/or consists of, the amino acid sequence set forth as SEQ ID NO: 51. In embodiments, an isolated polypeptide that elicits an immune response to a thyroglobulin polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as GLELLLDEIYDTIFAGLDLPSTFTETTLY (SEQ ID NO: 53), RLILPQMPKALFRKKVILEDKVKNFYTRLPFQ (SEQ ID NO: 54), GLREDLLSLQEPGSKTYSK (SEQ ID NO: 55), or LLLREEATHIYRKPGISLLSYEASVPSVPIST (SEQ ID NO: 56). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as one of SEQ ID NOS: 52-56, in any combination. In embodiments, an isolated polypeptide that elicits an immune response to a TPO polypeptide comprises, consists essentially of, and/or consists of, the amino acid sequence set forth as VADKILDLYKHPDNIDVWLGGLAENFLPRA (SEQ ID NO: 58), LLIGGFAGLTSTVICRWTRTGTKSTLPISE (SEQ ID NO: 59), RLRDSGRAYLPFVPPRAPAACAPEPGIPGE (SEQ ID NO: 60), or QYIDHDIAFTPQSTSKAAFGGGADCQMTCE (SEQ ID NO: 61). In some embodiments, an immunogenic composition includes the polypeptide having the amino acid sequence set forth as one of SEQ ID NOS: 58-61, in any combination.
In some embodiments, a disclosed composition includes one or more of the polypeptides set forth in Table 2, such as 1 or more SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, SEQ ID NO: 15, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 22, SEQ ID NO: 24, SEQ ID NO: 25, SEQ ID NO: 26, SEQ ID NO: 28, SEQ ID NO: 30, SEQ ID NO: 31, SEQ ID NO: 32, SEQ ID NO: 35, SEQ ID NO: 36, SEQ ID NO: 38, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 46, SEQ ID NO: 48, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, such as 2 or more, 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, 10 or more, 11 or more, 12 or more, 13 or more, 14 or more, 15 or more, 16 or more, 17 or more, 18 or more, 19 or more, 20 or more, 21 or more, 22 or more, 23 or more, 24 or more, 25 or more, 26 or more, 27 or more, 28 or more, 29 or more, 30 or more, 31 or more, 32 or more, 33 or more, 34 or more, 35 or more, 36 or more, 37 or more, 38 or more, 39 or more, or all 40 of SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, SEQ ID NO: 15, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 22, SEQ ID NO: 24, SEQ ID NO: 25, SEQ ID NO: 26, SEQ ID NO: 28, SEQ ID NO: 30, SEQ ID NO: 31, SEQ ID NO: 32, SEQ ID NO: 35, SEQ ID NO: 36, SEQ ID NO: 38, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 46, SEQ ID NO: 48, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, and/or SEQ ID NO: 61, in any combination.
In embodiments, and in particular for use in HLA-A01+ patients with tumors harboring the RET M918T mutation, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to RET (mutant and/or wildtype), calcitonin, CEA, MUC1, MUC4, NY-ESO-1, survivin, IDO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 2, 6, 3, 28, 30, 31, 32, 35, 36, 38, 42, 46, and 50. In embodiments, and in particular for use in HLA-A02+ patients with tumors harboring the RET M918T mutation, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to RET (mutant and/or wildtype), calcitonin, CEA, MUC1, MUC4, NY-ESO-1, survivin, IDO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 2, 7, 3, 28, 30, 31, 35, 36, 38, 41, 46, and 50. In embodiments, and in particular for use in HLA-A24+ patients with tumors harboring the RET M918T mutation, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to RET (mutant and/or wildtype), calcitonin, CEA, MUC1, MUC4, NY-ESO-1, survivin, IDO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 2, 5, 3, 28, 30, 31, 35, 36, 38, 44, 46, and 50. In embodiments, and in particular for use in with tumors with KRAS mutations but not exhibiting thyroglobulin expression, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to calcitonin, CEA, MUC1, MUC4, NY-ESO-1, survivin, IDO, and brachyury and mutant KRAS, such as the polypeptides set forth as SEQ ID NOS: 28, 30, 31, 32, 35, 36, 38, 41, 46, 50, 16, 18, and 19. In embodiments, and in particular for use in with tumors with HRAS mutations but not exhibiting thyroglobulin expression, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to calcitonin, CEA, MUC1, MUC4, NY-ESO-1, survivin, IDO, and brachyury and mutant HRAS, such as the polypeptides set forth as SEQ ID NOS: 28, 30, 31, 32, 35, 36, 38, 41, 46, 50, 12, 13, 14, and 15. In embodiments, and in particular for use in HLA-A01+ patients with BRAF mutation harboring tumors expressing thyroglobulin, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to mutant BRAF, thyroglobulin, TPO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 21, 22, 24, 53, 54, 55, 56, 58, 59, 60, 61, and 50. In embodiments, and in particular for use in HLA-A02+ patients with BRAF mutation harboring tumors expressing thyroglobulin, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to mutant BRAF, thyroglobulin, TPO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 21, 22, 25, 53, 54, 55, 56, 58, 59, 60, 61, and 50. In embodiments, and in particular for use in HLA-A24+ patients with BRAF mutation harboring tumors expressing thyroglobulin, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to BRAF, thyroglobulin, TPO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 21, 22, 26, 53, 54, 55, 56, 58, 59, 60, 61, and 50. In embodiments, and in particular for use in patients with HRAS mutation harboring tumors expressing thyroglobulin, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to mutant HRAS, thyroglobulin, TPO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 12, 13, 14, 15, 53, 54, 55, 56, 58, 59, 60, 61, and 50. In embodiments, and in particular for use in patients with KRAS mutation harboring tumors expressing thyroglobulin, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to mutant KRAS, thyroglobulin, TPO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 16, 18, 19, 53, 54, 55, 56, 58, 59, 60, 61, and 50. In embodiments, and in particular for use in HLA-A24+ patients with BRAF mutation harboring tumors expressing thyroglobulin, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to mutant BRAF, thyroglobulin, TPO, and brachyury, such as the polypeptides set forth as SEQ ID NOS: 21, 22, 26, 53, 54, 55, 56, 58, 59, 60, 61, and 50. In embodiments, and in particular for use in patients with tumors lacking mutations in RET, BRAF, KRAS and RAS, a disclosed immunogenic composition includes one or more isolated polypeptides, such as a plurality, that, when administered to a subject, elicit an immune response to calcitonin, CEA, MUC1, MUC4, survivin, IDO, and brachyury, such as the polypeptides set forth as 28, 30, 31, 32, 35, 36, 38, 41, 46, and 50.
The disclosed isolated polypeptides include synthetic embodiments of polypeptides described herein. In addition, analogs (non-peptide organic molecules), derivatives (chemically functionalized polypeptide molecules obtained starting with the disclosed polypeptide sequences) and variants (homologs) of these polypeptides can be utilized in the methods described herein. Each polypeptide of this disclosure is comprised of a sequence of amino acids, which may be either L- and/or D-amino acids, naturally occurring and otherwise.
Peptides can be modified by a variety of chemical techniques to produce derivatives having essentially the same activity as the unmodified polypeptides, and optionally having other desirable properties. For example, peptide sequences with lengths exceeding 19 amino acids, may be reduced in length by 1, 2, 3, 4 5, 6 or 7 amino acids from either the amine end, carboxyl end or both ends of the of the peptide sequence. In another example, carboxylic acid groups of the protein, whether carboxyl-term inal or side chain, can be provided in the form of a salt of a pharmaceutically-acceptable cation or esterified to form a C1-C16 ester, or converted to an amide of formula NR1R2 wherein R1 and R2 are each independently H or C1-C16 alkyl, or combined to form a heterocyclic ring, such as a 5- or 6-membered ring. Amino groups of the polypeptide, whether amino-terminal or side chain, can be in the form of a pharmaceutically-acceptable acid addition salt, such as the HCl, HBr, acetic, benzoic, toluene sulfonic, maleic, tartaric and other organic salts, or can be modified to C1-C16 alkyl or dialkyl amino or further converted to an amide.
Hydroxyl groups of the polypeptide side chains may be converted to C1-C16 alkoxy or to a C1-C16 ester using well-recognized techniques. Phenyl and phenolic rings of the polypeptide side chains may be substituted with one or more halogen atoms, such as fluorine, chlorine, bromine or iodine, or with C1-C16 alkyl, C1-C16 alkoxy, carboxylic acids and esters thereof, or amides of such carboxylic acids. Methylene groups of the polypeptide side chains can be extended to homologous C2-C4 alkylenes. Thiols can be protected with any one of a number of well-recognized protecting groups, such as acetamide groups. Those skilled in the art will also recognize methods for introducing cyclic structures into the polypeptides of this invention to select and provide conformational constraints to the structure that result in enhanced stability.
Peptidomimetic and organomimetic embodiments are envisioned, whereby the three-dimensional arrangement of the chemical constituents of such peptido- and organomimetics mimic the three-dimensional arrangement of the polypeptide backbone and component amino acid side chains, resulting in such peptido- and organomimetics of an immunogenic polypeptide having measurable or enhanced ability to generate an immune response. For computer modeling applications, a pharmacophore is an idealized three-dimensional definition of the structural requirements for biological activity. Peptido- and organomimetics can be designed to fit each pharmacophore with current computer modeling software (using computer assisted drug design or CADD). See Walters, “Computer-Assisted Modeling of Drugs,” in Klegerman & Groves, eds., 1993, Pharmaceutical Biotechnology, Interpharm Press: Buffalo Grove, Ill., pp. 165-174 and Principles of Pharmacology, Munson (ed.) 1995, Ch. 102, for descriptions of techniques used in CADD. Also included are mimetics prepared using such techniques.
In embodiments, an immunogenic polypeptide is included in a fusion protein. For example, any and all of the immunogenic polypeptides included in an immunogenic composition, including a plurality of immunogenic polypeptides, can be in the form of a fusion protein. Thus, the fusion protein can include an immunogenic polypeptide and a second heterologous moiety, such as a myc protein, an enzyme or a carrier (such as a hepatitis carrier protein or bovine serum albumin) covalently linked to the immunogenic polypeptide. A second heterologous moiety can be covalently or non-covalently linked to the immunogenic polypeptide. The immunogenic polypeptides can be included in a fusion protein and can also include heterologous sequences. Thus, in several specific non-limiting examples, one or more of the immunogenic polypeptides are included in a fusion polypeptide, for example a fusion of an immunogenic polypeptide with six sequential histidine residues, a β-galactosidase amino acid sequence, or an immunoglobulin amino acid sequence. The immunogenic polypeptides can also be covalently linked to a carrier. Suitable carriers include, but are not limited to, a hepatitis B small envelope protein HBsAg. This protein has the capacity to self-assemble into aggregates and can form viral-like particles. The preparation of HBsAg is well documented; see for example European Patent Application Publication No. EP-A-0 226 846, European Patent Application Publication No. EP-A-0 299 108 and PCT Publication No. WO 01/117554, and the amino acid sequence disclosed, for example, in Tiollais et al, Nature, 317: 489, 1985, and European Patent Publication No. EP-A-0 278 940, and PCT Publication No. WO 91/14703, all of which are incorporated herein by reference.
A fusion polypeptide can optionally include repetitions of one or more of any of the immunogenic polypeptides disclosed herein. In one specific, non-limiting example, the fusion polypeptide includes two, three, four, five, or up to ten repetitions of a single immunogenic polypeptide. In another example, the fusion polypeptide can optionally include two or more different immunogenic polypeptides disclosed herein. In one specific, non-limiting example, the fusion polypeptide includes two, three, four, five, ten or more different immunogenic polypeptides. A linker sequence can optionally be included between the immunogenic polypeptides.
In embodiments, an immunogenic polypeptide does not include the full-length amino acid sequence of RET, HRAS, KRAS, BRAF, calcitonin, carcinoembryonic antigen (CEA), MUC1, MUC4, NY-ESO-1, survivin, indoleamine 2,3-dioxygenase (IDO), HLA-G, TPO, thyroglobulinor brachyury.
In some embodiments, two or more different disclosed immunogenic polypeptides can be included on a polypeptide, such as an immunogenic molecule. For example, 2-20 or more different immunogenic polypeptides can be included in the polypeptide, such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or more different immunogenic polypeptides. The different immunogenic polypeptides can be separated by a linking molecule, for example polypeptide linkers, or a molecular scaffold.
The compositions described herein can include varying concentrations of each immunogenic polypeptide in a plurality of immunogenic polypeptides.
The immunogenic polypeptides can be covalently linked to a carrier, which is an immunogenic macromolecule to which an antigenic molecule can be bound. When bound to a carrier, the bound polypeptide becomes more immunogenic. Carriers are chosen to increase the immunogenicity of the bound molecule and/or to elicit higher titers of antibodies against the carrier which are diagnostically, analytically, and/or therapeutically beneficial. Covalent linking of a molecule to a carrier can confer enhanced immunogenicity and T cell dependence (see Pozsgay et al, PNAS 96:5194-97, 1999; Lee et al, J. Immunol. 116: 1711-18, 1976; Dintzis et al, PNAS 73:3671-75, 1976). Useful carriers include polymeric carriers, which can be natural (for example, polysaccharides, polypeptides or proteins from bacteria or viruses), semi-synthetic or synthetic materials containing one or more functional groups to which a reactant moiety can be attached. Bacterial products and viral proteins (such as hepatitis B surface antigen and core antigen) can also be used as carriers, as well as proteins from higher organisms such as keyhole limpet hemocyanin, horseshoe crab hemocyanin, edestin, mammalian serum albumins, and mammalian immunoglobulins. Additional bacterial products for use as carriers include bacterial wall proteins and other products (for example, streptococcal or staphylococcal cell walls and lipopolysaccharide (LPS)).
Nucleic acids encoding one or more of the immunogenic polypeptides are envisioned. These polynucleotides include DNA, cDNA and RNA sequences which encode the polypeptide(s) of interest. Nucleic acid molecules encoding these polypeptides can readily be produced by one of skill in the art, using the amino acid sequences provided herein, and the genetic code. In addition, one of skill can readily construct a variety of clones containing functionally equivalent nucleic acids, such as nucleic acids which differ in sequence but which encode the same polypeptide.
Nucleic acid sequences encoding one or more of the immunogenic polypeptides can be prepared by any suitable method including, for example, cloning of appropriate sequences or by direct chemical synthesis by methods such as the phosphotriester method of Narang et al, Meth. Enzymol. 68:90-99, 1979; the phosphodiester method of Brown et al, Meth. Enzymol. 68: 109-151, 1979; the diethylphosphoramidite method of Beaucage et al, Tetra. Lett. 22: 1859-1862, 1981; the solid phase phosphoramidite triester method described by Beaucage & Caruthers, Tetra. Letts. 22(20): 1859-1862, 1981, for example, using an automated synthesizer as described in, for example, Needham-VanDevanter et al., Nucl. Acids Res. 12:6159-6168, 1984; and, the solid support method of U.S. Pat. No. 4,458,066. Chemical synthesis produces a single stranded oligonucleotide. This can be converted into double stranded DNA by hybridization with a complementary sequence, or by polymerization with a DNA polymerase using the single strand as a template.
Exemplary nucleic acids including sequences encoding one or more of the immunogenic polypeptides disclosed herein can be prepared by cloning techniques. Examples of appropriate cloning and sequencing techniques, and instructions sufficient to direct persons of skill through cloning are found in Sambrook et al., supra, Berger and Kimmel (eds.), supra, and Ausubel, supra. Product information from manufacturers of biological reagents and experimental equipment also provide useful information. Such manufacturers include the SIGMA Chemical Company (Saint Louis, Mo.), R&D Systems (Minneapolis, Minn.), Pharmacia Amersham (Piscataway, N.J.), CLONTECH Laboratories, Inc. (Palo Alto, Calif.), Chem Genes Corp., Aldrich Chemical Company (Milwaukee, Wis.), Glen Research, Inc., GIBCO BRL Life Technologies, Inc. (Gaithersburg, Md.), Fluka Chemica-Biochemika Analytika (Fluka Chemie AG, Buchs, Switzerland), Invitrogen (San Diego, Calif.), and Applied Biosystems (Foster City, Calif.), as well as many other commercial sources known to one of skill.
Once the nucleic acids encoding one or more of the immunogenic polypeptides are isolated and cloned, the protein can be expressed in a recombinantly engineered cell such as bacteria, plant, yeast, insect and mammalian cells using a suitable expression vector. One or more DNA sequences encoding one or more immunogenic polypeptide can be expressed in vitro by DNA transfer into a suitable host cell. The cell may be prokaryotic or eukaryotic. The term also includes any progeny of the subject host cell. It is understood that all progeny may not be identical to the parental cell since there may be mutations that occur during replication. Methods of stable transfer, meaning that the foreign DNA is continuously maintained in the host, are known in the art.
Polynucleotide sequences encoding one or more of the immunogenic polypeptides can be operatively linked to expression control sequences (e.g., a promoter). An expression control sequence operatively linked to a coding sequence is ligated such that expression of the coding sequence is achieved under conditions compatible with the expression control sequences. The expression control sequences include, but are not limited to appropriate promoters, enhancers, transcription terminators, a start codon (i.e., ATG) in front of a protein-encoding gene, splicing signal for introns, maintenance of the correct reading frame of that gene to permit proper translation of mRNA, and stop codons.
The polynucleotide sequences encoding one or more of the immunogenic polypeptides can be inserted into an expression vector including, but not limited to a plasmid, virus or other vehicle that can be manipulated to allow insertion or incorporation of sequences and can be expressed in either prokaryotes or eukaryotes. Hosts can include microbial, yeast, insect and mammalian organisms. Methods of expressing DNA sequences having eukaryotic or viral sequences in prokaryotes are well known in the art.
Biologically functional viral and plasmid DNA vectors capable of expression and replication in a host are known in the art.
In embodiments, the immunogenic composition is a vaccine. A vaccine is a pharmaceutical composition that elicits a prophylactic or therapeutic immune response in a subject. In some cases, the immune response is a protective response. Typically, a vaccine elicits an antigen-specific immune response to an antigen of a cell, such as a cancer cell.
C. Therapeutic Formulations
The immunogenic compositions disclosed herein may be included in pharmaceutical compositions (including therapeutic and prophylactic formulations), and may be combined together with one or more pharmaceutically acceptable vehicles and, optionally, other therapeutic ingredients, such as adjuvants.
Such pharmaceutical compositions can be administered to subjects by a variety of administration modes, including by intramuscular, subcutaneous, intravenous, intra-atrial, intra-articular, intraperitoneal, parenteral routes oral, rectal, intranasal, intrapulmonary, or transdermal delivery, or by topical delivery to other surfaces.
To formulate a pharmaceutical composition, the immunogenic compositions can be combined with various pharmaceutically acceptable additives, as well as a base or vehicle for dispersion of the immunogenic compositions. Desired additives include, but are not limited to, pH control agents, such as arginine, sodium hydroxide, glycine, hydrochloric acid, citric acid, and the like. In addition, local anesthetics (for example, benzyl alcohol), isotonizing agents (for example, sodium chloride, mannitol, sorbitol), adsorption inhibitors (for example, TWEEN® 80), solubility enhancing agents (for example, cyclodextrins and derivatives thereof), stabilizers (for example, serum albumin), and reducing agents (for example, glutathione) can be included.
Adjuvants, such as aluminum hydroxide (for example, AMPHOGEL®, Wyeth Laboratories, Madison, N.J.), Freund's adjuvant, MPLTM (3-O-deacylated monophosphoryl lipid A; Corixa, Hamilton, Ind.) and IL-12 (Genetics Institute, Cambridge, Mass.), among many other suitable adjuvants well known in the art, can be included in the compositions. In embodiments, a immunogenic composition includes Complete Freund's Adjuvant (CFA), gardiquimod and Poly(I:C).
When the composition is a liquid, the tonicity of the formulation, as measured with reference to the tonicity of 0.9% (w/v) physiological saline solution taken as unity, is typically adjusted to a value at which no substantial, irreversible tissue damage will be induced at the site of administration. Generally, the tonicity of the solution is adjusted to a value of about 0.3 to about 3.0, such as about 0.5 to about 2.0, or about 0.8 to about 1.7.
The immunogenic compositions can be dispersed in a base or vehicle, which can include a hydrophilic compound having a capacity to disperse the immunogenic composition, and any desired additives. The base can be selected from a wide range of suitable compounds, including but not limited to, copolymers of polycarboxylic acids or salts thereof, carboxylic anhydrides (for example, maleic anhydride) with other monomers (for example, methyl (meth)acrylate, acrylic acid and the like), hydrophilic vinyl polymers, such as polyvinyl acetate, polyvinyl alcohol, polyvinylpyrrolidone, cellulose derivatives, such as hydroxymethylcellulose, hydroxypropylcellulose and the like, and natural polymers, such as chitosan, collagen, sodium alginate, gelatin, hyaluronic acid, and nontoxic metal salts thereof. Often, a biodegradable polymer is selected as a base or vehicle, for example, polylactic acid, poly(lactic acid-glycolic acid) copolymer, polyhydroxybutyric acid, poly(hydroxybutyric acid-glycolic acid) copolymer and mixtures thereof. Alternatively or additionally, synthetic fatty acid esters such as polyglycerin fatty acid esters, sucrose fatty acid esters and the like can be employed as vehicles. Hydrophilic polymers and other vehicles can be used alone or in combination, and enhanced structural integrity can be imparted to the vehicle by partial crystallization, ionic bonding, cross-linking and the like. The vehicle can be provided in a variety of forms, including fluid or viscous solutions, gels, pastes, powders, microspheres and films for direct application to a mucosal surface. The immunogenic composition can be combined with the base or vehicle according to a variety of methods, and release of the immunogenic composition can be by diffusion, disintegration of the vehicle, or associated formation of water channels. In some circumstances, the immunogenic composition is dispersed in microcapsules (microspheres) or nanocapsules (nanospheres) prepared from a suitable polymer, for example, isobutyl 2-cyanoacrylate (see, for example, Michael et al., J. Pharmacy Pharmacol. 43: 1-5, 1991), and dispersed in a biocompatible dispersing medium, which yields sustained delivery and biological activity over a protracted time. The immunogenic compositions of the disclosure can alternatively contain as pharmaceutically acceptable vehicles substances as required to approximate physiological conditions, such as pH adjusting and buffering agents, tonicity adjusting agents, wetting agents and the like, for example, sodium acetate, sodium lactate, sodium chloride, potassium chloride, calcium chloride, sorbitan monolaurate, and triethanolamine oleate. For solid compositions, conventional nontoxic pharmaceutically acceptable vehicles can be used which include, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talcum, cellulose, glucose, sucrose, magnesium carbonate, and the like.
Pharmaceutical compositions for administering the immunogenic compositions can also be formulated as a solution, microemulsion, or other ordered structure suitable for high concentration of active ingredients. The vehicle can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, liquid polyethylene glycol, and the like), and suitable mixtures thereof. Proper fluidity for solutions can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of a desired particle size in the case of dispersible formulations, and by the use of surfactants. In many cases, it will be desirable to include isotonic agents, for example, sugars, polyalcohols, such as mannitol and sorbitol, or sodium chloride in the composition. Prolonged absorption of the immunogenic compositions can be brought about by including in the composition an agent which delays absorption, for example, monostearate salts and gelatin.
In certain embodiments, the immunogenic compositions can be administered in a time release formulation, for example in a composition which includes a slow release polymer. These compositions can be prepared with vehicles that will protect against rapid release, for example a controlled release vehicle such as a polymer, microencapsulated delivery system or bioadhesive gel. Prolonged delivery in various immunogenic compositions of the disclosure can be brought about by including in the composition agents that delay absorption, for example, aluminum monostearate hydrogels and gelatin. When controlled release formulations are desired, controlled release binders suitable for use in accordance with the disclosure include any biocompatible controlled release material which is inert to the active agent and which is capable of incorporating the immunogenic composition and/or other biologically active agent. Numerous such materials are known in the art. Useful controlled-release binders are materials that are metabolized slowly under physiological conditions following their delivery (for example, at a mucosal surface, or in the presence of bodily fluids). Appropriate binders include, but are not limited to, biocompatible polymers and copolymers well known in the art for use in sustained release formulations. Such biocompatible compounds are non-toxic and inert to surrounding tissues, and do not trigger significant adverse side effects, such as nasal irritation, immune response, inflammation, or the like. They are metabolized into metabolic products that are also biocompatible and easily eliminated from the body. Exemplary polymeric materials for use in the present disclosure include, but are not limited to, polymeric matrices derived from copolymeric and homopolymeric polyesters having hydrolyzable ester linkages. A number of these are known in the art to be biodegradable and to lead to degradation products having no or low toxicity. Exemplary polymers include polyglycolic acids and polylactic acids, poly(DL-lactic acid-co-glycolic acid), poly(D-lactic acid-co-glycolic acid), and poly(L-lactic acid-co-glycolic acid). Other useful biodegradable or bioerodable polymers include, but are not limited to, such polymers as poly(epsilon-caprolactone), poly(epsilon-aprolactone-CO-lactic acid), poly(epsilon.-aprolactone-CO-glycolic acid), poly(beta-hydroxy butyric acid), poly(alkyl-2-cyanoacrilate), hydrogels, such as poly(hydroxyethyl methacrylate), polyamides, poly(amino acids) (for example, L-leucine, glutamic acid, L-aspartic acid and the like), poly(ester urea), poly(2-hydroxyethyl DL-aspartamide), polyacetal polymers, polyorthoesters, polycarbonate, polymaleamides, polysaccharides, and copolymers thereof. Many methods for preparing such formulations are well known to those skilled in the art (see, for example, Sustained and Controlled Release Drug Delivery Systems, J. R. Robinson, ed., Marcel Dekker, Inc., New York, 1978). Other useful formulations include controlled-release microcapsules (U.S. Pat. Nos. 4,652,441 and 4,917,893), lactic acid-glycolic acid copolymers useful in making microcapsules and other formulations (U.S. Pat. Nos. 4,677,191 and 4,728,721) and sustained-release compositions for water-soluble polypeptides (U.S. Pat. No. 4,675,189).
The pharmaceutical compositions of the disclosure typically are sterile and stable under conditions of manufacture, storage and use. Sterile solutions can be prepared by incorporating the immunogenic compositions in the required amount in an appropriate solvent with one or a combination of ingredients enumerated herein, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the immunogenic composition and/or other biologically active agent into a sterile vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated herein. In the case of sterile powders, methods of preparation include vacuum drying and freeze-drying which yields a powder of the immunogenic composition plus any additional desired ingredient from a previously sterile-filtered solution thereof. The prevention of the action of microorganisms can be accomplished by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like.
D. Methods of Treatment
The immunogenic compositions disclosed herein (including immunogenic polypeptides), or nucleic acids encoding the immunogenic polypeptides, polynucleotides encoding such polypeptides and vectors comprising the polynucleotides, can be used in methods of generating or eliciting an immune response, treating a subject with cancer, such as medullary thyroid cancer, and decreasing the growth of a tumor associated medullary thyroid cancer, as described below. In several examples, the subject has medullary thyroid cancer.
In several embodiments, the methods include administering to a subject with an effective amount, such as an immunologically effective dose, of one or more of the immunogenic compositions disclosed in order to generate an immune response. The methods can include selecting a subject in need of treatment, such as a subject that has, is suspected of having, or is predisposed to having cancer, for example a solid tumor, In embodiments, a subject is selected that has or is suspected of having thyroid cancer, such as medullary thyroid carcinoma. Such methods include selecting a subject having or suspected of having cancer, and administering to the subject a therapeutically effective amount of a disclosed immunogenic composition, thereby treating the subject. In embodiments, the cancer is a solid tumor. In embodiments, the cancer comprises thyroid cancer, such as medullary thyroid carcinoma. An immune response is a response of a cell of the immune system, such as a B-cell, T-cell, macrophage or peripheral blood mononuclear cell, to a stimulus. An immune response can include any cell of the body involved in a host defense response. An immune response includes, but is not limited to, an adaptive immune response or inflammation. In some examples, an immune response is stimulated by administering to a subject a vaccine and/or disclosed immunogenic composition.
In exemplary applications, the immunogenic compositions are administered to a subject having a disease, such as cancer (for example, medullary thyroid carcinoma), in an amount sufficient to raise an immune response to cells expressing the antigens targeted by the immunogenic composition. Administration induces a sufficient immune response to slow the proliferation of such cells or to inhibit their growth, or to reduce a sign or a symptom of a tumor. Amounts effective for this use will depend upon the severity of the disease, the general state of the patient's health, and the robustness of the patient's immune system. In one example, a therapeutically effective amount of the compound is that which provides either subjective relief of a symptom(s) or an objectively identifiable improvement as noted by the clinician or other qualified observer.
In accordance with the various treatment methods of the disclosure, the immunogenic composition can be delivered to a subject in a manner consistent with conventional methodologies associated with management of the disorder for which treatment or prevention is sought. In accordance with the disclosure herein, a prophylactically or therapeutically effective amount of the immunogenic composition and/or other biologically active agent is administered to a subject in need of such treatment for a time and under conditions sufficient to prevent, inhibit, and/or ameliorate a selected disease or condition or one or more symptom(s) thereof, such as cancer, for example medullary thyroid carcinoma.
Typical subjects intended for treatment with the compositions and methods of the present disclosure include humans, as well as non-human primates and other animals. To identify subjects for prophylaxis or treatment according to the methods of the disclosure, accepted screening methods are employed to determine risk factors associated with a targeted or suspected disease of as discussed herein, or to determine the status of an existing disease or condition in a subject. These screening methods include, for example, conventional work-ups to determine environmental, familial, occupational, and other such risk factors that may be associated with the targeted or suspected disease or condition, as well as diagnostic methods, such as various ELISA and other immunoassay methods, which are available and well known in the art to detect and/or characterize disease-associated markers. These and other routine methods allow the clinician to select patients in need of therapy using the methods and pharmaceutical compositions of the disclosure. In accordance with these methods and principles, immunogenic compositions and/or other biologically active agent can be administered according to the teachings herein as an independent prophylaxis or treatment program, or as a follow-up, adjunct or coordinate treatment regimen to other treatments, including surgery, vaccination, immunotherapy, hormone treatment, and the like.
The immunogenic compositions can be used in coordinate vaccination protocols or combinatorial formulations. In certain embodiments, novel combinatorial immunogenic compositions and coordinate immunization protocols employ separate immunogens or formulations, each directed toward eliciting a desired immune response. The separate immunogens disclosed herein can be combined in a polyvalent immunogenic composition administered to a subject in a single immunization step, or they can be administered separately (in monovalent immunogenic compositions) in a coordinate immunization protocol.
The administration of the immunogenic compositions of the disclosure can be for either prophylactic or therapeutic purpose. When provided prophylactically, the immunogenic composition is provided in advance of any symptom. The prophylactic administration of the immunogenic composition serves to prevent or ameliorate any progression on the disease. When provided therapeutically, the immunogenic composition is provided at (or shortly after) the onset of a symptom of disease. For prophylactic and therapeutic purposes, the immunogenic compositions can be administered to the subject in a single bolus delivery, via continuous delivery (for example, continuous transdermal, mucosal or intravenous delivery) over an extended time period, or in a repeated administration protocol (for example, by an hourly, daily or weekly, repeated administration protocol). The therapeutically effective dosage of the immunogenic composition can be provided as repeated doses within a prolonged prophylaxis or treatment regimen that will yield clinically significant results to alleviate one or more symptoms or detectable conditions associated with a targeted disease or condition as set forth herein. Determination of effective dosages in this context is typically based on animal model studies followed up by human clinical trials and is guided by administration protocols that significantly reduce the occurrence or severity of targeted disease symptoms or conditions in the subject. Suitable models in this regard include, for example, murine, rat, porcine, feline, non-human primate, and other accepted animal model subjects known in the art. Alternatively, effective dosages can be determined using in vitro models (for example, immunologic and histopathologic assays). Using such models, only ordinary calculations and adjustments are required to determine an appropriate concentration and dose to administer a therapeutically effective amount of the immunogenic composition (for example, amounts that are effective to elicit a desired immune response or alleviate one or more symptoms of a targeted disease). In alternative embodiments, an effective amount or effective dose of the immunogenic compositions may simply inhibit or enhance one or more selected biological activities correlated with a disease or condition, as set forth herein, for either therapeutic or diagnostic purposes.
The actual dosage of the immunogenic compositions will vary according to factors such as the disease indication and particular status of the subject (for example, the subject's age, size, fitness, extent of symptoms, susceptibility factors, and the like), time and route of administration, other drugs or treatments being administered concurrently, as well as the specific pharmacology of the immunogenic compositions for eliciting the desired activity or biological response in the subject. Dosage regimens can be adjusted to provide an optimum prophylactic or therapeutic response. A therapeutically effective amount is a quantity of a specific substance (for example, this may be the amount of a disclosed immunogenic composition useful in increasing resistance to, preventing, ameliorating, and/or treating cancer, such as medullary thyroid carcinoma) sufficient to achieve a desired effect in a subject being treated without causing a substantial cytotoxic effect in the subject. For example, a therapeutically effective amount of composition can vary from about 0.01 mg/kg body weight to about 1 g/kg body weight. When administered to a subject, a dosage will generally be used that will achieve target concentrations shown to achieve a desired in vivo effect. A therapeutically effective amount is also one in which any toxic or detrimental side effects of the immunogenic composition and/or other biologically active agent is outweighed in clinical terms by therapeutically beneficial effects. A non-limiting range for a therapeutically effective amount of a the immunogenic composition and/or other biologically active agent within the methods and formulations of the disclosure is about 0.01 mg/kg body weight to about 10 mg/kg body weight, such as about 0.05 mg/kg to about 5 mg/kg body weight, or about 0.2 mg/kg to about 2 mg/kg body weight.
Upon administration of a immunogenic composition of the disclosure (for example, via injection, aerosol, oral, topical or other route), the immune system of the subject typically responds to the immunogenic composition by producing T cells capable of expanding and reacting to the specific antigenic epitopes presented by the immunogenic composition. Such a response signifies that an immunologically effective dose of the immunogenic composition was delivered. An immunologically effective dosage can be achieved by single or multiple administrations (including, for example, multiple administrations per day), daily, or weekly administrations. For each particular subject, specific dosage regimens can be evaluated and adjusted over time according to the individual need and professional judgment of the person administering or supervising the administration of the immunogenic composition. In some embodiments, the T cell response, as measured by ELISPOT, tetramer staining or intracellular cytokine staining of a subject administered the compositions of the disclosure will be determined in the context of evaluating effective dosages/immunization protocols. In some instances it will be sufficient to assess the percentage of antigen specific T cells and their phenotype via ELISPOT or intracellular cytokine staining. Decisions as to whether to administer booster inoculations and/or to change the amount of the composition administered to the individual can be at least partially based on the ELISPOT data, tetramer staining data or intracellcular cytokine staining data.
Dosage can be varied by the attending clinician to maintain a desired concentration. Higher or lower concentrations can be selected based on the mode of delivery. Dosage can also be adjusted based on the release rate of the administered formulation.
These immunogenic compositions can be used for active immunization, and for preparation of immune antibodies. The immunogenic compositions are composed of non-toxic components, suitable for infants, children of all ages, and adults.
Kits are also provided. In one embodiment, these kits include a container or formulation that contains one or more of the immunogenic compositions described herein. In one example, this component is formulated in a pharmaceutical preparation for delivery to a subject. The immunogenic composition is optionally contained in a bulk dispensing container or unit or multi-unit dosage form. Optional dispensing means can be provided. Packaging materials optionally include a label or instruction indicating for what treatment purposes and/or in what manner the pharmaceutical agent packaged therewith can be used.
The immunogenic composition of this disclosure can be employed to generate antibodies that recognize the antigens disclosed herein and the antigen from which the disclosed antigen was derived. The methods include administering to a subject immunogenic composition including a disclosed antigen or administering to the subject a polynucleotide encoding a disclosed antigen to generate antibodies that recognize the disclosed antigen. The subject employed in this embodiment is one typically employed for antibody production. Mammals, such as, rodents, rabbits, goats, sheep, etc., are preferred.
The antibodies generated can be either polyclonal or monoclonal antibodies. Polyclonal antibodies are raised by injecting (for example subcutaneous or intramuscular injection) antigenic polypeptides into a suitable animal (for example, a mouse or a rabbit). The antibodies are then obtained from blood samples taken from the animal. The techniques used to produce polyclonal antibodies are extensively described in the literature. Polyclonal antibodies produced by the subjects can be further purified, for example, by binding to and elution from a matrix that is bound with the polypeptide against which the antibodies were raised. Those of skill in the art will know of various standard techniques for purification and/or concentration of polyclonal, as well as monoclonal, antibodies. Monoclonal antibodies can also be generated using techniques known in the art.
E. Synthesis of Polypeptides
The polypeptides used in the disclosed immunogenic compositions can be made by any method available in the art, for example synthesized using solid-phase polypeptide synthesis techniques familiar to those in the art, including Fmoc chemistry, or purification of polypeptides from recombinant prokaryotic or eukaryotic sources.
The disclosed immunogenic compositions can be prepared by cloning techniques. Examples of appropriate cloning and sequencing techniques and instructions sufficient to direct persons of skill through many cloning exercises are found in Sambrook et al, Molecular Cloning: A Laboratory Manual (2nd Ed.), Vols. 1-3, Cold Spring Harbor Laboratory (1989), Berger and Kimmel (eds.), Guide to Molecular Cloning Techniques, Academic Press, Inc., San Diego Calif. (1987) or Ausubel et al. (eds.), Current Protocols in Molecular Biology, Greene Publishing and Wiley-Interscience, NY (1987). Product information from manufacturers of biological reagents and experimental equipment also provide useful information. Such manufacturers include the SIGMA chemical company (Saint Louis, Mo.), R&D systems (Minneapolis, Minn.), Pharmacia LKB Biotechnology (Piscataway, N.J.), CLONTECH® laboratories, Inc. (Palo Alto, Calif.), Chem Genes Corp., Aldrich Chemical Company (Milwaukee, Wis.), Glen Research, Inc., GIBCO BRL Life Technologies, Inc. (Gaithersburg, Md.), Fluka Chemica-Biochemika Analytika (Fluka Chemie AG, Buchs, Switzerland), INVITROGENTM (San Diego, Calif.) and Applied Biosystems (Foster City, Calif.), as well as many other commercial sources known to one of skill.
Peptides for the disclosed immunogenic compositions may be produced, for example by chemical synthesis by any of a number of manual or automated methods of synthesis known in the art. In addition, polypeptides that form all or part of a hetero-bifunctional ligand can be produced synthetically. For example, solid phase polypeptide synthesis (SPPS) is carried out on a 0.25 millimole (mmole) scale using an Applied Biosystems Model 43 IA Peptide Synthesizer and using 9-fluorenylmethyloxycarbonyl (Fmoc) amino-terminus protection, coupling with dicyclohexylcarbodiimide/hydroxybenzotriazole or 2-(IH-1-benzo-triazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate/hydroxybenzotriazole (HBTU/HOBT) and using p-hydroxymethylphenoxymethylpolystyrene (HMP) or Sasrin resin for carboxyl-terminus acids or Rink amide resin for carboxyl-terminus amides. Fmoc-derivatized amino acids are prepared from the appropriate precursor amino acids by tritylation and triphenylmethanol in trifluoroacetic acid, followed by Fmoc derivitization as described by Atherton et al. Solid Phase Peptide Synthesis, IRL Press: Oxford, 1989.
F. Potent Vaccine Adjuvant for MeddieVax
To be safe and effective, a therapeutic cancer vaccine must target self-derived, tumor-specific proteins and elicit a robust immune response. While the polypeptide component of MeddieVax provides the “epitope code” specifying the desired antigens to prime an immune response, polypeptides alone are typically insufficient to provoke a robust immune response. To produce a robust immune response, polypeptide vaccines require a strong adjuvant capable of supplying biochemical danger signals, which alert the immune system to the presence of pathogens. The development of the MeddieVax Adjuvant is now discussed.
In 1898, Dr. William Coley reported a series of case studies whereby bacterial toxins from erysipelas and bacillus prodigiousus were injected into the tumors of inoperable sarcoma patients. Remarkably, several patients never recurred and were apparently cured. Over a century later, molecular biology has advanced enough to provide a plausible explanation for this outcome. The bacterial toxins likely disrupted the tumor environment and supplied the requisite “danger signals” via pathogen activated molecular patterns (PAMPs) to activate dendritic cells by promoting expression of CD80 and CD86 and the secretion of key cytokines, including IL-6. The activated dendritic cells could then prime T cells and B cells to carry out their effector functions against tumor cells. Evidently, the lack of an appropriate danger signal may have prevented the initiation of an effective immune response earlier in the course of tumor development as the tumor neoantigens were present prior to bacterial toxin inoculation. Since Coley's initial experiments, our understanding of the immune response has been illuminated by numerous animal models of autoimmune disease, highlighting the biological impact of various adjuvants in polypeptide vaccination.
When deployed with the proper adjuvant, polypeptide vaccines are capable of provoking profound autoimmune responses. Complete Freund's Adjuvant (CFA), consisting of heat-killed mycobacterium tuberculosis in non-metabolizable paraffin oil and mannide monooleate, is readily capable of eliciting strong and targeted autoimmune responses. For instance, primates vaccinated with epitopes of myelin oligodendrocyte glycoprotein in CFA often develop fatal autoimmune encephalitis within weeks of injection. Mice vaccinated with CFA and retinal polypeptides subsequently develop blindness due to rapid immune destruction of photoreceptors in their eyes. Rabbits vaccinated with collagen in CFA have been documented to develop symptomatic and crippling arthritis. Furthermore, autoimmune thyroiditis can be readily induced in mice by vaccination of whole protein thyroglobulin in CFA. Conversely, when animals are inoculated with polypeptides in a vehicle lacking any adjuvant function, there is usually no discernible response, and furthermore, future immune responses to such antigens can be dampened even in the presence of a strong adjuvant. Adjuvants are critical elements of a vaccine, as they play an indispensable role in provoking and shaping the immune response.
In cancer, where some degree of immune tolerance has possibly been established, a potent adjuvant is required to prime antigen-presenting cells (APCs) with a “danger signal,” in order to break immune tolerance. This concept is analogous to the use of Coley's toxins, which are designed to mimic the natural process of infection, so that antigens can be presented in the appropriate context, in order to engage the immune system. Work on cancer immunotherapy has now spanned three centuries, and it is only in the 21st century that the molecular underpinnings of T cell activation have become well defined.
The adaptive arm of human immune system has intrinsic safeguards to prevent immune responses against self-derived proteins and the development of autoimmune disease. In order to activate effector T cells, antigen-presenting dendritic cells must first be activated with external molecules, which have pathogenic molecular signatures. Toll-like receptors (TLRs) are a major class of dendritic cell surface receptors capable of detecting molecularly conserved microbial complexes. Upon binding of TLR ligands (TLR agonists), TLRs initiate a cascade of intracellular signal events, which activate dendritic cells, priming them to activate effector T cells. TLR ligand binding supplies the required danger signal to induce expression of co-stimulating molecules CD80 and CD86 on dendritic cells and induce secretion of IL-6. CD80 and CD86 serve as activating ligands for the CD28 receptor on T cells, and IL-6 is required for T cells to overcome inhibition by regulatory T cells. The absolute necessity of both CD80/86 expression and IL-6 secretion for dendritic cell activation was only recently discovered by Chandrashekhar Pasare and Ruslan Medzhitov in a series of elegant experiments employing knockout mice. In the absence of either signal, immune tolerance is promoted by dendritic cells.
With ab initio knowledge of the power of CFA to induce profound autoimmune responses, the inventor conducted a set of experiments, in order to evaluate the viability of adding additional adjuvants to CFA, in order to enhance efficacy. CFA, an agonist of TLR2, TLR4 and TLR9, was evaluated alone or in combination with gardiquimod (TLR7 agonist) and Poly(I:C) (TLR3 agonist) supplied from Invitrogen. The adjuvant combinations were evaluated for their ability induce both CD80/CD86 expression on dendritic cells and induce secretion of IL-6. The use of multiple TLR agonists was hypothesized to better mimic the process of natural infection and therefore more potently prime dendritic cells.
In addition to the MeddieVax Adjuvant and administration method discussed in the preceding section, a number of other adjuvants and administration methods may be employed to deliver MeddieVax polypeptides into the patient's body. Other potential adjuvants include, but are not limited to, heat-killed bacteria, mechanically pulverized bacteria, interleukins, aluminum hydroxide, cytosine guanine oligodeoxynucleotide (CpG), RNA oligonucleotides, granulocyte macrophage colony stimulating factor (GM-CSF), saponins, squalene, monophosphoryl lipid A (MPLA), triacylated lipoproteins, other toll-like receptor (TLR) agonists, or recombinant bacteria designed to express the polypeptide components of MeddieVax.
EXAMPLES
Example 1
Design of the MeddieVax Immunogenic Composition
This example describes the development of the MeddieVax immunogenic compositions disclosed herein. A functional description of MeddieVax in the context of rational design and novelty will now be elaborated. The polypeptide component of MeddieVax will first be described followed by a description of the adjuvant.
Identification of Tumor Targets: mRNA Profiling of MTC Cell Line Kinase Activity
In order to mine the mechanisms of cellular transformation in MTC, semi-quantitative PCR was used to characterize the relative expression of 42 receptor tyrosine kinases (RTKs) from several available MTC cells lines. MTC TT cells are known to harbor a RET C634W mutation, whereas the MZ-CRC-1 cell line has a RET M918T mutation. The results are shown in Table 1, where relative expression values range from 0 to 100. This approach yielded the following over-activated kinase targets: CSF1R, c-KIT, MET, RET and VEGFR2. All five kinases play essential roles in stem cell renewal and homeostasis. Therefore, targeting all of them is not a viable vaccination strategy due to the potential for severe autoimmune side effects. Of these kinases, only RET has been found to be mutated in a substantial number of MTC tumor specimens, thereby providing a therapeutic window as the antigens encoding the mutated RET kinase can be specifically targeted with its corresponding non-canonical polypeptide sequence.







TABLE 1







Relative mRNA Expression in MTC Cell Lines












Gene
TT
MZ-CRC-1
Gene
TT
MZ-CRC-1















AXL
0
0
IDO
67
73


CSF1R
67
60
IGF1R
20
27


EGFR
27
40
INSR
40
47


EPHA1
0
0
C-KIT
53
73


EPHA2
7
67
C-MER
3
20


EPHA3
40
47
MET
47
73


EPHA4
0
0
MUSK
0
0


EPHA6
0
7
NTRK1
13
0


EPHA7
40
47
NTRK2
13
0


EPHB1
33
47
NTRK3
33
7


EPHB2
33
33
PDGFRA
27
27


EPHB4
20
20
PDGRFB
13
7


EPHB6
7
0
RET
93
100


FGFR1
33
47
ROR1
40
40


FGFR2
7
7
ROR2
0
7


FGFR3
0
0
TIE-1
0
7


FGFR4
27
27
TIE-2
7
7


FLT3
0
0
TYRO3
13
13


HER2/NEU
13
13
VEGFR1
13
7


HER3
27
40
VEGFR2
87
93


HER4
0
13
VEGFR3
0
0









Prediction Algorithms Used to Engineer MeddieVax
The polypeptide sequences in MeddieVax were engineered using in silico analysis of results from three prediction algorithms. The prediction algorithms were used to predict MHC I and MHC II polypeptide binding affinities as well as capacity of MeddieVax polypeptides to function as linear B cell epitopes. The SYFPEITHI algorithm was used for MHC I binding predictions, while the NetMHCIIpan prediction algorithm was used for MHC II predictions. The LBtope algorithm was used for linear B cell epitope prediction.
Each prediction algorithm employs a unique scoring system to classify MHC binding affinity or B cell epitope probability. For SYFPEITHI, strong MHC I binders are 9-mer polypeptides with a SYFPEITHI score greater than or equal to 20. For NetMHCIIpan, binding affinity results are given in units of nM for 15-mer polypeptides. Strong binders are assumed to have binding values<=100 nM, while weak binders are assigned a cutoff of 500 nM. Polypeptides with binding affinities exceeding 500 nM are classified as non-binders. For LBtope, predication values above 70% are classified as likely B cell epitopes.
Unlike many other human genes, the HLA genes which code for MHC I and MHC II exhibit great diversity among the population, and thus patient response to vaccination may be vary greatly depending on the patient's unique HLA profile. To gauge population-wide immunogenic potential, prediction results are provided for commonly occurring HLA alleles. For MHC I, the HLA A-1, HLA A-2 and HLA-A24 alleles are included as they cover an estimated 70% of the population. MHC I results are given for the 9-mer polypeptide with the maximum SYFPEITHI score for each MeddieVax sequence for each of the three alleles.
For MHC II, the result is computed in the following manner. First, the 15-mer with the highest binding affinity is determined for each allele in a diverse set of six HLA-DR alleles (DRB1*1501, DRB1*0701, DRB1*0301, DRB1*1101, DRB1*1302, DRB1*1202). Then the median is used to generate a single parameter, which serves as an estimate for population-wide HLA-DR binding affinity. There are dozens of HLA-DR alleles, but the six analyzed encompass about 32% of the population and are geographically diverse. As such, they are intended to be representative for sampling purposes. The B cell epitope predications are not allele specific, as B cell binding is determine by somatic hypermutation. To be considered as an MHC II epitope, polypeptide sequences must be at least 13 amino acids in length, and thus 9-mer polypeptides are excluded. Table 3 summarizes the prediction algorithm results for MHC I binding,
MHC II Binding and Linear B Cell Probability for MeddieVax Polypeptides
The results show that based on advanced prediction algorithms, MeddieVax polypeptides have the capacity to bind to B cell receptors and MHC molecules across multiple HLA allele types, which is a critical component of immunogenicity.
Targeting RET
In agreement with mRNA profiling, numerous studies have established the RET oncogene as a dominant mutational driver in a majority of MTC cases. Sporadic cases account for  ̃75% of all MTC cases, and a RET mutation is found in majority of sporadic MTC cases. Also, germline RET mutations are found in nearly 100% of genetic MTC cases. In sporadic patients harboring a RET mutation, the RET M918T mutation is most prevalent, while the C634W and C643R mutations are most common in genetic cases. These RET mutations are known to induce constitutive, ligand-free phosphorylation of the RET kinase. Such mutations are particularly oncogenic, as they lead to activation of numerous downstream pathways involved in growth, proliferation, survival and motility, including RAS/RAF/MEK/ERK, PI3K/AKT, NF—KB and STAT3.
While the two FDA-approved therapies inhibit RET at IC50<100 nM concentration, studies have shown that inhibition is only partial at physiologically achievable concentrations and RET's tyrosine residues remain phosphorylated at peak doses. Given the key importance of RET in MTC and the inability to fully inhibit RET with current pharmaceutical regimens MeddieVax was designed to engage the immune system target both mutated and non-mutated portions of the RET protein, as RET is thought to be expressed in all MTC cells, which is in good agreement with mRNA data from Table 1. The canonical RET M918T sequence is provide below.







(SEQ ID NO: 1)







MAKATSGAAGLRLLLLLLLPLLGKVALGLYFSRDAYWEKLYVDQAAGTPL


 


LYVHALRDAPEEVPSFRLGQHLYGTYRTRLHENNWICIQEDTGLLYLNRS


 


LDHSSWEKLSVRNRGFPLLTVYLKVFLSPTSLREGECQWPGCARVYFSFF


 


NTSFPACSSLKPRELCFPETRPSFRIRENRPPGTFHQFRLLPVQFLCPNI


 


SVAYRLLEGEGLPFRCAPDSLEVSTRWALDREQREKYELVAVCTVHAGAR


 


EEVVMVPFPVTVYDEDDSAPTFPAGVDTASAVVEFKRKEDTVVATLRVFD


 


ADVVPASGELVRRYTSTLLPGDTWAQQTFRVEHWPNETSVQANGSFVRAT


 


VHDYRLVLNRNLSISENRTMQLAVLVNDSDFQGPGAGVLLLHFNVSVLPV


 


SLHLPSTYSLSVSRRARRFAQIGKVCVENCQAFSGINVQYKLHSSGANCS


 


TLGVVTSAEDTSGILFVNDTKALRRPKCAELHYMVVATDQQTSRQAQAQL


 


LVTVEGSYVAEEAGCPLSCAVSKRRLECEECGGLGSPTGRCEWRQGDGKG


 


ITRNFSTCSPSTKTCPDGHCDVVETQDINICPQDCLRGSIVGGHEPGEPR


 


GIKAGYGTCNCFPEEEKCFCEPEDIQDPLCDELCRTVIAAAVLFSFIVSV


 


LLSAFCIHCYHKFAHKPPISSAEMTFRRPAQAFPVSYSSSGARRPSLDSM


 


ENQVSVDAFKILEDPKWEFPRKNLVLGKTLGEGEFGKVVKATAFHLKGRA


 


GYTTVAVKMLKENASPSELRDLLSEFNVLKQVNHPHVIKLYGACSQDGPL


 


LLIVEYAKYGSLRGFLRESRKVGPGYLGSGGSRNSSSLDHPDERALTMGD


 


LISFAWQISQGMQYLAEMKLVHRDLAARNILVAEGRKMKISDFGLSRDVY


 


EEDSYVKRSQGRIPVKWTAIESLFDHIYTTQSDVWSFGVLLWEIVTLGGN


 


PYPGIPPERLFNLLKTGHRMERPDNCSEEMYRLMLQCWKQEPDKRPVFAD


 


ISKDLEKMMVKRRDYLDLAASTPSDSLIYDDGLSEEETPLVDCNNAPLPR


 


ALPSTWIENKLYGMSDPNWPGESPVPLTRADGTNTGFPRYPNDSVYANWM


 


LSPSAAKLMDTFDS






The following RET RTK polypeptide sequences were identified as targets for producing an immune response to RET expressing cells:







(SEQ. ID NO: 2)









QGRIPVKWTAIESLFDHIYTT



 







(SEQ. ID NO: 3)









RENRPPGTFHQFRLLPVQFLCPNISVAYRL



 







(SEQ. ID NO: 4)









PX1KWTAIEX2,






where X1 is Y or T and X2 is Y or I, such as








(SEQ. ID NO: 5)









PYKWTAIEI



or







(SEQ. ID NO: 6)









PTKWTAIEY



 







(SEQ. ID NO: 7)









RLPVKWTAL






SEQ. ID NO: 2 is a non-HLA restricted and specifically targets amino acids 910-930 of RET bearing the M918T mutation. SEQ. ID NO: 3 targets a hydrophilic extracellular portion of non-mutant RET corresponding to amino acids 176-206, and SEQS. 3-5 are HLA-A24, HLA-A1 and HLA-A2 restricted respectively, and have been modified in the 2nd and C terminal positions to enhance MHC I binding to activate HLA-restricted cytotoxic T cell responses. SEQ. ID Nos: 2 and 3 are of sufficient length to activate adaptive immune responses from B cells, cytotoxic T cells and T helper cells.
Targeting RAS and BRAF Mutations
While RET is the most common molecular driver of MTC, present in  ̃65% of tumor specimens, whole exome sequencing has revealed other mutually exclusive, molecular drivers. Activating point mutations in the RAS GTPases (KRAS and HRAS) as well as BRAF are present in  ̃20% of MTC cases. All told, RET, RAS or BRAF mutations are found in 85% of MTC tumors. The canonical sequences for HRAS, KRAS and BRAF are provided below.







HRAS:







(SEQ ID NO: 8)







MTEYKLVVVGAGGVGKSALTIQLIQNHFVDEYDPTIEDSYRKQVVIDGET


 


CLLDILDTAGQEEYSAMRDQYMRTGEGFLCVFAINNTKSFEDIHQYREQI


 


KRVKDSDDVPMVLVGNKCDLAARTVESRQAQDLARSYGIPYIETSAKTRQ


 


GVEDAFYTLVREIRQHKLRKLNPPDESGPGCMSCKCVLS


 


KRAS:







(SEQ ID NO: 9)







MTEYKLVVVGAGGVGKSALTIQLIQNHFVDEYDPTIEDSYRKQVVIDGET


 


CLLDILDTAGQEEYSAMRDQYMRTGEGFLCVFAINNTKSFEDIHHYREQI


 


KRVKDSEDVPMVLVGNKCDLPSRTVDTKQAQDLARSYGIPFIETSAKTRQ


 


RVEDAFYTLVREIRQYRLKKISKEEKTPGCVKIKKCIIM


 


BRAF







(SEQ ID NO: 10)







MAALSGGGGGGAEPGQALFNGDMEPEAGAGAGAAASSAADPAIPEEVWNI


 


KQMIKLTQEHIEALLDKFGGEHNPPSIYLEAYEEYTSKLDALQQREQQLL


 


ESLGNGTDFSVSSSASMDTVTSSSSSSLSVLPSSLSVFQNPTDVARSNPK


 


SPQKPIVRVFLPNKQRTVVPARCGVTVRDSLKKALMMRGLIPECCAVYRI


 


QDGEKKPIGWDTDISWLTGEELHVEVLENVPLTTHNFVRKTFFTLAFCDF


 


CRKLLFQGFRCQTCGYKFHQRCSTEVPLMCVNYDQLDLLFVSKFFEHHPI


 


PQEEASLAETALTSGSSPSAPASDSIGPQILTSPSPSKSIPIPQPFRPAD


 


EDHRNQFGQRDRSSSAPNVHINTIEPVNIDDLIRDQGFRGDGGSTTGLSA


 


TPPASLPGSLTNVKALQKSPGPQRERKSSSSSEDRNRMKTLGRRDSSDDW


 


EIPDGQITVGQRIGSGSFGTVYKGKWHGDVAVKMLNVTAPTPQQLQAFKN


 


EVGVLRKTRHVNILLFMGYSTKPQLAIVTQWCEGSSLYHHLHIIETKFEM


 


IKLIDIARQTAQGMDYLHAKSIIHRDLKSNNIFLHEDLTVKIGDFGLATV


 


KSRWSGSHQFEQLSGSILWMAPEVIRMQDKNPYSFQSDVYAFGIVLYELM


 


TGQLPYSNINNRDQIIFMVGRGYLSPDLSKVRSNCPKAMKRLMAECLKKK


 


RDERPLFPQILASIELLARSLPKIHRSASEPSLNRAGFQTEDFSLYACAS


 


PKTPIQAGGYGAFPVH.






To provide broad coverage against multiple driver mutations, MeddieVax also targets commonly found mutations in RAS and BRAF with the following polypeptide sequences.







(SEQ. ID NO: 11)









DGETCLLDILDTAGX1EEYSAMRDQYMRTG,






where X1 can be R or K, such as SEQ ID NO: 12 or 13.

The HRAS Q61R mutation is targeted with SEQ. ID NO: 12.







(SEQ. ID NO: 12)









DGETCLLDILDTAGREEYSAMRDQYMRTG






The HRAS Q61K mutation is targeted with SEQ. ID NO: 13.







(SEQ. ID NO: 13)









DGETCLLDILDTAGKEEYSAMRDQYMRTG






The HRAS G13R mutation is target with SEQ. ID NO: 14.







(SEQ. ID NO: 14)









MTEYKLVVVGAGRVGKSALTIQLIQ.






The HRAS K117N mutation is targeted with SEQ. ID NO: 15.







(SEQ. ID NO: 15)









VKDSDDVPMVLVGNNCDLAARTVESRQAQ






The KRAS A146V mutation is targeted with SEQ. ID NO: 16.







(SEQ. ID NO: 16)









DLARSYGIPFIETSVKTRQRVEDAFYTLV.






The KRAS mutation at position 12 can be targeted with SEQ. ID NO: 17.







(SEQ. ID NO: 17)









MTEYKLVVVGAX1GVGKSALTIQL






where X1 can be V or R, such as SEQ ID NO: 18 or 19.

The KRAS G12V mutation is targeted with SEQ. ID NO: 18.







(SEQ. ID NO: 18)









MTEYKLVVVGAVGVGKSALTIQL.






The KRAS G12R mutation is targeted with SEQ. ID NO: 19.







(SEQ. ID NO: 19)









MTEYKLVVVGARGVGKSALTIQL






BRAF Mutations at position 600 can be targeted by SEQ ID NO: 20.







(SEQ. ID NO: 20)









EDLTVKIGDFGLATX1KSRWSGSHQFEQL,






where X1 can be E or K, such as SEQ ID NO: 21 or 22.

The BRAF V600E is targeted with SEQ. ID NO: 21.







(SEQ. ID NO: 21)









EDLTVKIGDFGLATEKSRWSGSHQFEQL






The BRAF V600K is targeted with SEQ. ID NO: 22.







(SEQ. ID NO: 22)









EDLTVKIGDFGLATKKSRWSGSHQFEQL






To improve MHC binding relative to the canonical sequence, BRAF mutations are targeted with the following HLA-restricted altered polypeptide ligands, corresponding to V600E and V600K mutations.







(SEQ. ID NO: 23)









GX1ATX2KSRX3






where X1=T, L or Y, X2=E or K, X3=Y, L, or F, such as SEQ ID NO: 24-26.

SEQ. ID NO: 24 is HLA-A1 restricted.







(SEQ. ID NO: 24)









GTATX2KSRY,






SEQ. ID NO: 25 is HLA-A2 restricted.







(SEQ. ID NO: 25)









GLATX2KSRL,






where X2=E or K.

SEQ. ID NO: 26 is HLA-A24 restricted.







(SEQ. ID NO: 26)









GYATX2KSRF,






where X2=E or K.
Targeting Calcitonin
A primary function of the parafollicular C-cells from which MTC originates is the synthesis and secretion of the 32-amino acid polypeptide hormone calcitonin. As a result, MTC broadly expresses calcitonin and calcitonin levels are elevated in the vast majority of MTC patients. Research has indicated that calcitonin is involved, to some degree, in calcium homeostasis and bone remodeling. Despite its diagnostic importance, calcitonin appears to have very limited physiological activity in adults. Patients who have undergone complete thyroidectomies and have undetectable levels of calcitonin (<2 pg/mL) do not experience overt osteoporosis, while advanced MTC patients with serum calcitonin levels 10,000× normal levels do not experience overt osteopetrosis or calcitonin-induced disruption in calcium homeostasis. This is in direct contrast to parathyroid hormone, where parathyroid carcinomas are known to produce lethal levels of parathyroid hormone, which can fatally disrupt calcium homeostasis.
The canonical sequence for calcitonin is provided below. Calcitonin:







(SEQ ID NO: 27)









CGNLSTCMLGTYTQDFNKFHTFPQTAIGVGAP






Given its exquisite tumor specificity and physiological irrelevance, provoking an autoimmune response to eliminate calcitonin-producing cells could be highly beneficial to MTC patients. MeddieVax is designed to target calcitonin with the following modified-calcitonin polypeptide sequence, whereby side chain glycine residues have been replaced by slightly bulker amino acids at the 2nd and 30th positions. SEQ. ID NO: 28 has been modified from the native form of calcitonin, in order to enhance predicted B cell immunogenicity.







(SEQ. ID NO: 28)









CTNLSTCMLGTYTQDFNKFHTFPQTAIGVAAP






Targeting CEA
Carcinoembryonic antigen (CEA) is a cell surface adhesion molecule, which is frequently overexpressed in MTC. Indeed, CEA is often used alongside calcitonin as a serum tumor marker to monitor disease progression or disease recurrence in MTC patients. The velocity of CEA increase, as indicated by the CEA doubling time, serves as a proxy for tumor growth, and therefore has strong prognostic value. The CEA molecule is intimately involved in the metastatic process. As CEA has a particularly high affinity for fibronectin, CEA is hypothesized to help cells anchor to blood vessels at distant sites and establish metastatic foci. Furthermore, CEA has a high self-affinity and therefore is likely to play a role in tumor formations, by promoting intracellular adhesion.
The canonical CEA sequence is provided below.







(SEQ ID NO: 29)







MESPSAPPHRWCIPWQRLLLTASLLTFWNPPTTAKLTIESTPFNVAEGKE


 


VLLLVHNLPQHLFGYSVVYKGERVDGNRQIIGYVIGTQQATPGPAYSGRE


 


IIYPNASLLIQNIIQNDTGFYTLHVIKSDLVNEEATGQFRVYPELPKPSI


 


SSNNSKPVEDKDAVAFTCEPETQDATYLWWVNNQSLPVSPRLQLSNGNRT


 


LTLFNVTRNDTASYKCETQNPVSARRSDSVILNVLYGPDAPTISPLNTSY


 


RSGENLNLSCHAASNPPAQYSWFVNGTFQQSTQELFIPNITVNNSGSYTC


 


QAHNSDTGLNRTTVTTITVYAEPPKPFITSNNSNPVEDEDAVALTCEPEI


 


QNTTYLWWVNNQSLPVSPRLQLSNDNRTLTLLSVTRNDVGPYECGIQNKL


 


SVDHSDPVILNVLYGPDDPTISPSYTYYRPGVNLSLSCHAASNPPAQYSW


 


LIDGNIQQHTQELFISNITEKNSGLYTCQANNSASGHSRTTVKTITVSAE


 


LPKPSISSNNSKPVEDKDAVAFTCEPEAQNTTYLWWVNGQSLPVSPRLQL


 


SNGNRTLTLFNVTRNDARAYVCGIQNSVSANRSDPVTLDVLYGPDTPIIS


 


PPDSSYLSGANLNLSCHSASNPSPQYSWRINGIPQQHTQVLFIAKITPNN


 


NGTYACFVSNLATGRNNSIVKSITVSASGTSPGLSAGATVGIMIGVLVGV


 


A






Given its broad expression in MTC and pathogenic potential, MeddieVax is designed to target CEA. The following polypeptide sequences are employed.







(SEQ. ID NO: 30)









TYACFVSNLATGRNNSIVKSITVSASGTSP



 







(SEQ. ID NO: 31)









LIQNIIQNDTGFYTLHVIKSDLVNEEAT



 







(SEQ. ID NO: 32)









ITEKNSGLY






SEQ ID NOS; 30 and 31 are non-HLA restricted and specifically target amino acids 652-681 and 108-135 of CEA, respectively. SEQ. NO: 32 is HLA-24 restricted and targets amino acids 467-475.
Targeting MUC-1 and MUC-4
MUC1 and MUC4 are members of the mucin-like glycoprotein family. MUC1 and MUC4 are frequently overexpressed in MTC as a result of RET-driven STAT3 activation. MUC1 and MUC4 play oncogenic roles in proliferation, metabolism, invasion, metastasis, and angiogenesis. Specifically, the mucins mediate production of growth factors, influence hypoxic glucose metabolism, and promote metastasis by repressing e-cadherin expression.
MUC4 has been modified to enhance predicted B cell immunogenicity. The canonical sequences for MUC1 and MUC4 are provided below.







MUC1:







(SEQ ID NO: 33)







MTPGTQSPFFLLLLLTVLTVVTGSGHASSTPGGEKETSATQRSSVPSSTE


 


KNAVSMTSSVLSSHSPGSGSSTTQGQDVTLAPATEPASGSAATWGQDVTS


 


VPVTRPALGSTTPPAHDVTSAPDNKPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGS


 


TAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTS


 


APDTRPAPGSTAPPAHGVTSAPDTRPAPGSTAPPAHGVTSAPDNRPALGS


 


TAPPVHNVTSASGSASGSASTLVHNGTSARATTTPASKSTPFSIPSHHSD


 


TPTTLASHSTKTDASSTHHSSVPPLTSSNHSTSPQLSTGVSFFFLSFHIS


 


NLQFNSSLEDPSTDYYQELQRDISEMFLQIYKQGGFLGLSNIKFRPGSVV


 


VQLTLAFREGTINVHDVETQFNQYKTEAASRYNLTISDVSVSDVPFPFSA


 


QSGAGVPGWGIALLVLVCVLVALAIVYLIALAVCQCRRKNYGQLDIFPAR


 


DTYHPMSEYPTYHTHGRYVPPSSTDRSPYEKVSAGNGGSSLSYTNPAVAA


 


TSANL


 


MUC4:







(SEQ ID NO: 34)







MKGARWRRVPWVSLSCLCLCLLPHVVPGTTEDTLITGSKTAAPVTSTGST


 


TATLEGQSTAASSRTSNQDISASSQNHQTKSTETTSKAQTDTLTQMMTST


 


LFSSPSVHNVMETVTQETAPPDEMTTSFPSSVTNTLMMTSKTITMTTSTD


 


STLGNTEETSTAGTESSTPVTSAVSITAGQEGQSRTTSWRTSIQDTSASS


 


QNHWTRSTQTTRESQTSTLTHRTTSTPSFSPSVHNVTGTVSQKTSPSGET


 


ATSSLCSVTNTSMMTSEKITVTTSTGSTLGNPGETSSVPVTGSLMPVTSA


 


ALVTVDPEGQSPATFSRTSTQDTTAFSKNHQTQSVETTRVSQINTLNTLT


 


PVTTSTVLSSPSGFNPSGTVSQETFPSGETTISSPSSVSNTFLVTSKVFR


 


MPISRDSTLGNTEETSLSVSGTISAITSKVSTIWWSDTLSTALSPSSLPP


 


KISTAFHTQQSEGAETTGRPHERSSFSPGVSQEIFTLHETTTWPSSFSSK


 


GHTTWSQTELPSTSTGAATRLVTGNPSTRAAGTIPRVPSKVSAIGEPGEP


 


TTYSSHSTTLPKTTGAGAQTQWTQETGTTGEALLSSPSYSVIQMIKTATS


 


PSSSPMLDRHTSQQITTAPSTNHSTIHSTSTSPQESPAVSQRGHTRAPQT


 


TQESQTTRSVSPMTDTKTVTTPGSSFTASGHSPSEIVPQDAPTISAATTF


 


APAPTGNGHTTQAPTTALQAAPSSHDATLGPSGGTSLSKTGALTLANSVV


 


STPGGPEGQVVTSASASTSPDTAAAMTHTHQAESTEASGQTQTSEPASSG


 


SRTTSAGTATPSSSGASGTTPSGSEGISTSGETTRFSSNPSRDSHTTQST


 


TELLSASASHGAIPVSTGMASSIVPGTFHPTLSEASTAGRPTGQSSPTSP


 


SASPQETAAISRMAQTQRTGTSRGSDTISLASQATDTFSTVPPTPPSITS


 


SGLTSPQTQTHTLSPSGSGKTFTTALISNATPLPVTSTSSASTGHATPLA


 


VSSATSASTVSSDSPLKMETSGMTTPSLKTDGGRRTATSPPPTTSQTIIS


 


TIPSTAMHTRSTAAPIPILPERGVSLFPYGAGAGDLEFVRRTVDFTSPLF


 


KPATGFPLGSSLRDSLYFTDNGQIIFPESDYQIFSYPNPLPTGFTGRDPV


 


ALVAPFWDDADFSTGRGTTFYQEYETFYGEHSLLVQQAESWIRKMTNNGG


 


YKARWALKVTWVNAHAYPAQWTLGSNTYQAILSTDGSRSYALFLYQSGGM


 


QWDVAQRSGNPVLMGFSSGDGYFENSPLMSQPVWERYRPDRFLNSNSGLQ


 


GLQFYRLHREERPNYRLECLQWLKSQPRWPSWGWNQVSCPCSWQQGRRDL


 


RFQPVSIGRWGLGSRQLCSFTSWRGGVCCSYGPWGEFREGWHVQRPWQLA


 


QELEPQSWCCRWNDKPYLCALYQQRRPHVGCATYRPPQPAWMFGDPHITT


 


LDGVSYTFNGLGDFLLVGAQDGNSSFLLQGRTAQTGSAQATNFIAFAAQY


 


RSSSLGPVTVQWLLEPHDAIRVLLDNQTVTFQPDHEDGGGQETFNATGVL


 


LSRNGSEVSASFDGWATVSVIALSNILHASASLPPEYQNRTEGLLGVWNN


 


NPEDDFRMPNGSTIPPGSPEEMLFHFGMTWQINGTGLLGKRNDQLPSNFT


 


PVFYSQLQKNSSWAEHLISNCDGDSSCIYDTLALRNASIGLHTREVSKNY


 


EQANATLNQYPPSINGGRVIEAYKGQTTLIQYTSNAEDANFTLRDSCTDL


 


ELFENGTLLWTPKSLEPFTLEILARSAKIGLASALQPRTVVCHCNAESQC


 


LYNQTSRVGNSSLEVAGCKCDGGTFGRYCEGSEDACEEPCFPSVHCVPGK


 


GCEACPPNLTGDGRHCAALGSSFLCQNQSCPVNYCYNQGHCYISQTLGCQ


 


PMCTCPPAFTDSRCFLAGNNFSPTVNLELPLRVIQLLLSEEENASMAEVN


 


ASVAYRLGTLDMRAFLRNSQVERIDSAAPASGSPIQHWMVISEFQYRPRG


 


PVIDFLNNQLLAAVVEAFLYHVPRRSEEPRNDVVFQPISGEDVRDVTALN


 


VSTLKAYFRCDGYKGYDLVYSPQSGFTCVSPCSRGYCDHGGQCQHLPSGP


 


RCSCVSFSIYTAWGEHCEHLSMKLDAFFGIFFGALGGLLLLGVGTFVVLR


 


FWGCSGARFSYFLNSAEALP






MeddieVax is designed to target MUC1 and MUC4 with the following polypeptide sequences.









MUC1:







(SEQ. ID NO: 35)









QRDISEMFLQIYKQGGFLGLSNIKFRPGSVVV



 



MUC4:







(SEQ. ID NO: 36)









ESDYQIFSYPNPLPSGFT






Targeting NY-ESO-1
The tumor-associated antigen NY-ESO-1, originally isolated from an esophageal carcinoma specimen, is frequently overexpressed in MTC, but rarely expressed in normal tissue except the testis, which is an immunoprivileged site.
The canonical sequence is provided below.







(SEQ ID NO: 37)







MQAEGRGTGGSTGDADGPGGPGIPDGPGGNAGGPGEAGATGGRGPRGAGA


 


ARASGPGGGAPRGPHGGAASGLNGCCRCGARGPESRLLEFYLAMPFATPM


 


EAELARRSLAQDAPPLPVPGVLLKEFTVSGNILTIRLTAADHRQLQLSIS


 


SCLQQLSLLMWITQCFLPVFLAQPPSGQRR






MeddieVax is designed to target NY-ESO-1 with the following polypeptide sequence, corresponding to amino acids 82-111 of the NY-ESO-1 protein.







(SEQ. ID NO: 38)









GPESRLLEFYLAMPFATPMEAELARRSLAQ






Targeting Survivin
Survivin is a tumor-associated anti-apoptotic protein, which is minimally expressed in normal adult human tissue, but commonly overexpressed by cancer cells. Survivin confers resistance to apoptosis and is thus involved in cancer cell survival. Immunohistochemistry indicates that survivin is broadly expressed in MTC. The canonical survivin sequence is provided below.







Survivin:







(SEQ ID NO: 39)







MGAPTLPPAWQPFLKDHRISTFKNWPFLEGCACTPERMAEAGFIHCPTEN


 


EPDLAQCFFCFKELEGWEPDDDPIEEHKKHSSGCAFLSVKKQFEELTLGE


 


FLKLDRERAKNKIAKETNNKKKEFEETAKKVRRAIEQLAAMD






MeddieVax is designed to target survivin with the following sequences.







(SEQ. ID NO: 40)









AFLSVKKQFEELX1LGEFLKX2DRERAKNKIA,






where X1=T, or Y, and X2=L, Y or I, such as SEQ ID NO: 41-44.








(SEQ. ID NO: 41)









AFLSVKKQFEELTLGEFLKLDRERAKNKIA



 







(SEQ. ID NO: 42)









AFLSVKKQFEELTLGEFLKYDRERAKNKIA



 







(SEQ. ID NO: 43)









AFLSVKKQFEELTLGEFLKIDRERAKNKIA



 







(SEQ. ID NO: 44)









AFLSVKKQFEELYLGEFLKLDRERAKNKIA






SEQ. ID NO: 39 is designed to target multiple HLA types, whereas SEQ. ID NOs: 40-42 are HLA-A1, HLA-A2 and HLA-A24 restricted, respectively.
Targeting Indoleamine 2,3-Dioxygenase (100):
The enzyme Indoleamine 2,3-dioxygenase (IDO) is overexpressed in MTC, likely as a result of RET-driven STAT3 activation. IDO catalyzes the conversion of tryptophan to kynurenine. As kynurenine suppresses helper T cell proliferation and induces regulatory T cell proliferation, IDO is highly immunosuppressive and is associated with reduced T cell infiltration of tumors. The canonical sequence for the IDO gene is provided below.







IDO:







(SEQ ID NO: 45)







MAHAMENSWTISKEYHIDEEVGFALPNPQENLPDFYNDWMFIAKHLPDLI


 


ESGQLRERVEKLNMLSIDHLTDHKSQRLARLVLGCITMAYVWGKGHGDVR


 


KVLPRNIAVPYCQLSKKLELPPILVYADCVLANWKKKDPNKPLTYENMDV


 


LFSFRDGDCSKGFFLVSLLVEIAAASAIKVIPTVFKAMQMQERDTLLKAL


 


LEIASCLEKALQVFHQIHDHVNPKAFFSVLRIYLSGWKGNPQLSDGLVYE


 


GFWEDPKEFAGGSAGQSSVFQCFDVLLGIQQTAGGGHAAQFLQDMRRYMP


 


PAHRNFLCSLESNPSVREFVLSKGDAGLREAYDACVKALVSLRSYHLQIV


 


TKYILIPASQQPKENKTSEDPSKLEAKGTGGTDLMNFLKTVRSTTEKSLL


 


KEG






As a countermeasure against escape mechanism #5, MeddieVax is designed to target IDO with the following sequence.







(SEQ. ID NO: 46)









PRNIAVPYCQLSKKLELPPILVYADCVLAN






Targeting HLA-G
The human leukocyte antigen G (HLA-G) is a non-classic MHC class I molecule, which promotes immune tolerance. Unlike classical MHC class I molecules, (HLA-A, HLA-B and HLA-C), HLA-G exhibits very restricted tissue expression and does not present intracellular polypeptide fragments (antigens) to T cells. Like other MHC molecules, HLA-G serves as a ligand for inhibitory receptors on NK cells. As such, cells exclusively presenting HLA-G are spared destruction by NK, while failing to present antigens to cytotoxic T cells via classic MHC I molecules. In short, cells which exclusively express HLA-G are highly immune to attack from NK cells and cytotoxic T cells.
The prime biological role of HLA-G is maternal-fetal tolerance. The fetal trophoblast broadly expresses HLA-G, thereby preventing destruction by maternal NK cells. To evade destruction by the host's immune system, cancer cells may overexpress HLA-G, while downregulating classical MHC I expression. In doing so, cancer cells cloak themselves from the host immune system by hijacking the same mechanism employed by the developing fetus to avoid rejection from the mother's immune system.
Tumor expression of HLA-G is a negative prognostic indicator, significantly associated with reduced survival. As a countermeasure against HLA-G (escape mechanisms #6), MeddieVax is designed with a unique sequence designed to induce antibodies against HLA-G. The canonical form of HLA-G is provided below.







HLA-G:







(SEQ ID NO. 47)







MVVMAPRTLFLLLSGALTLTETWAGSHSMRYFSAAVSRPGRGEPRFIAM


 


GYVDDTQFVRFDSDSACPRMEPRAPWVEQEGPEYWEEETRNTKAHAQTDR


 


MNLQTLRGYYNQSEASSHTLQWMIGCDLGSDGRLLRGYEQYAYDGKDYLA


 


LNEDLRSWTAADTAAQISKRKCEAANVAEQRRAYLEGTCVEWLHRYLENG


 


KEMLQRADPPKTHVTHHPVFDYEATLRCWALGFYPAEIILTWQRDGEDQT


 


QDVELVETRPAGDGTFQKWAAVVVPSGEEQRYTCHVQHEGLPEPLMLRWK


 


QSSLPTIPIMGIVAGLVVLAAVVTGAAVAAVLWRKKSSD






MeddieVax is designed to target HLA-G with the following polypeptide sequence.







(SEQ. ID NO: 48)









QTDRLNLQTLRGYYN






SEQ. ID NO: 48 codes for the al extracellular domain (exon 2), which is found on all membrane-bound and soluble forms of HLA-G. The sequence is modified from its canonical form to enhance predicted B cell immunogenicity. HLA-G displays strong sequence homology to other HLA molecules and perfect sequence homology in many regions of the gene. Notably, SEQ. ID NO: 46 is unique to HLA-G, which is intentionally selected to prevent immune responses from being provoked against other HLA molecules.
Targeting Brachyury
The T Box transcription factor protein brachyury is expressed in thyroid tissues and can be overexpressed in MTC. Brachyury has been implicated in rendering tumor cells resistant to chemotherapy and radiation. Furthermore, molecular evidence indicates that brachyury-derived transcription activities cause epithelial tumor cells to transform into cells with mesenchymal properties. In turn, the associated loss of e-cadherin, among other factors, results in metastasis. The canonical brachyury sequence is provided below.







Brachyury:







(SEQ ID NO: 49)







MSSPGTESAGKSLQYRVDHLLSAVENELQAGSEKGDPTERELRVGLEE


 


SELWLRFKELTNEMIVTKNGRRMFPVLKVNVSGLDPNAMYSFLLDFVAAD


 


NHRWKYVNGEWVPGGKPEPQAPSCVYIHPDSPNFGAHWMKAPVSFSKVKL


 


TNKLNGGGQIMLNSLHKYEPRIHIVRVGGPQRMITSHCFPETQFIAVTAY


 


QNEEITALKIKYNPFAKAFLDAKERSDHKEMMEEPGDSQQPGYSQWGWLL


 


PGTSTLCPPANPHPQFGGALSLPSTHSCDRYPTLRSHRSSPYPSPYAHRN


 


NSPTYSDNSPACLSMLQSHDNWSSLGMPAHPSMLPVSHNASPPTSSSQYP


 


SLWSVSNGAVTPGSQAAAVSNGLGAQFFRGSPAHYTPLTHPVSAPSSSGS


 


PLYEGAAAATDIVDSQYDAAAQGRLIASWTPVSPPSM






MeddieVax is designed to target cells overexpressing brachyury with the following sequence.







(SEQ. ID NO: 50)









KLNGGGQIMLNSLHKYEPRIHIVRVGGPQR






Targeting Mutant Passenger Proteins
As each patient's tumor harbors unique mutations, MeddieVax is designed to target those mutations, which can be determined using whole exome sequencing systems, such as the Illumina Hi-Seq. The vaccine is specifically designed to target missense mutations, where changes in DNA result in a single amino being swapped for a different amino acid. For instance, in the common BRAF V600E mutation, a glutamic acid residue (E) is substituted for the native valine residue (V) as a result of a thymine to adenine swap in the codon corresponding to valine. To target such patient specific mutations, MeddieVax employs the following generic 25 amino acid sequence, where U represents the canonical amino acids and X, the lone mutated amino acid. The mutated amino acid, X, is in the center and bordered on each side by 12 canonical amino acids, denoted here by U.







(SEQ. ID NO: 51)









UUUUUUUUUUUUXUUUUUUUUUUUU






Targeting Thyroglobulin and Thyroid Peroxidase
On occasion, medullary thyroid carcinomas exhibit a mixed medullary-follicular phenotype, expressing both thyroglobulin and thyroid peroxidase (TPO), which are normally expressed in papillary and follicular thyroid carcinomas. As both thyroglobulin and TPO are highly expressed and likely exclusively expressed in the thyroid, they function as viable targets for therapeutic vaccination. MeddieVax is designed to target tumors expressing thyroglobulin and/or TPO.
The canonical thyroglobulin sequence is provided below.







Thyroglobulin:







(SEQ ID NO: 52)







MALVLEIFTLLASICWVSANIFEYQVDAQPLRPCELQRETAFLKQADYVP


 


QCAEDGSFQTVQCQNDGRSCWCVGANGSEVLGSRQPGRPVACLSFCQLQK


 


QQILLSGYINSTDTSYLPQCQDSGDYAPVQCDVQQVQCWCVDAEGMEVYG


 


TRQLGRPKRCPRSCEIRNRRLLHGVGDKSPPQCSAEGEFMPVQCKFVNTT


 


DMMIFDLVHSYNRFPDAFVTFSSFQRRFPEVSGYCHCADSQGRELAETGL


 


ELLLDEIYDTIFAGLDLPSTFTETTLYRILQRRFLAVQSVISGRFRCPTK


 


CEVERFTATSFGHPYVPSCRRNGDYQAVQCQTEGPCWCVDAQGKEMHGTR


 


QQGEPPSCAEGQSCASERQQALSRLYFGTSGYFSQHDLFSSPEKRWASPR


 


VARFATSCPPTIKELFVDSGLLRPMVEGQSQQFSVSENLLKEAIRAIFPS


 


RGLARLALQFTTNPKRLQQNLFGGKFLVNVGQFNLSGALGTRGTFNFSQF


 


FQQLGLASFLNGGRQEDLAKPLSVGLDSNSSTGTPEAAKKDGTMNKPTVG


 


SFGFEINLQENQNALKFLASLLELPEFLLFLQHAISVPEDVARDLGDVME


 


TVLSSQTCEQTPERLFVPSCTTEGSYEDVQCFSGECWCVNSWGKELPGSR


 


VRGGQPRCPTDCEKQRARMQSLMGSQPAGSTLFVPACTSEGHFLPVQCFN


 


SECYCVDAEGQAIPGTRSAIGKPKKCPTPCQLQSEQAFLRTVQALLSNSS


 


MLPTLSDTYIPQCSTDGQWRQVQCNGPPEQVFELYQRWEAQNKGQDLTPA


 


KLLVKIMSYREAASGNFSLFIQSLYEAGQQDVFPVLSQYPSLQDVPLAAL


 


EGKRPQPRENILLEPYLFWQILNGQLSQYPGSYSDFSTPLAHFDLRNCWC


 


VDEAGQELEGMRSEPSKLPTCPGSCEEAKLRVLQFIRETEEIVSASNSSR


 


FPLGESFLVAKGIRLRNEDLGLPPLFPPREAFAEQFLRGSDYAIRLAAQS


 


TLSFYQRRRFSPDDSAGASALLRSGPYMPQCDAFGSWEPVQCHAGTGHCW


 


CVDEKGGFIPGSLTARSLQIPQCPTTCEKSRTSGLLSSWKQARSQENPSP


 


KDLFVPACLETGEYARLQASGAGTWCVDPASGEELRPGSSSSAQCPSLCN


 


VLKSGVLSRRVSPGYVPACRAEDGGFSPVQCDQAQGSCWCVMDSGEEVPG


 


TRVTGGQPACESPRCPLPFNASEVVGGTILCETISGPTGSAMQQCQLLCR


 


QGSWSVFPPGPLICSLESGRWESQLPQPRACQRPQLWQTIQTQGHFQLQL


 


PPGKMCSADYADLLQTFQVFILDELTARGFCQIQVKTFGTLVSIPVCNNS


 


SVQVGCLTRERLGVNVTWKSRLEDIPVASLPDLHDIERALVGKDLLGRFT


 


DLIQSGSFQLHLDSKTFPAETIRFLQGDHFGTSPRTWFGCSEGFYQVLTS


 


EASQDGLGCVKCPEGSYSQDEECIPCPVGFYQEQAGSLACVPCPVGRTTI


 


SAGAFSQTHCVTDCQRNEAGLQCDQNGQYRASQKDRGSGKAFCVDGEGRR


 


LPWWETEAPLEDSQCLMMQKFEKVPESKVIFDANAPVAVRSKVPDSEFPV


 


MQCLTDCTEDEACSFFTVSTTEPEISCDFYAWTSDNVACMTSDQKRDALG


 


NSKATSFGSLRCQVKVRSHGQDSPAVYLKKGQGSTTTLQKRFEPTGFQNM


 


LSGLYNPIVFSASGANLTDAHLFCLLACDRDLCCDGFVLTQVQGGAIICG


 


LLSSPSVLLCNVKDWMDPSEAWANATCPGVTYDQESHQVILRLGDQEFIK


 


SLTPLEGTQDTFTNFQQVYLWKDSDMGSRPESMGCRKDTVPRPASPTEAG


 


LTTELFSPVDLNQVIVNGNQSLSSQKHWLFKHLFSAQQANLWCLSRCVQE


 


HSFCQLAEITESASLYFTCTLYPEAQVCDDIMESNAQGCRLILPQMPKAL


 


FRKKVILEDKVKNFYTRLPFQKLMGISIRNKVPMSEKSISNGFFECERRC


 


DADPCCTGFGFLNVSQLKGGEVTCLTLNSLGIQMCSEENGGAWRILDCGS


 


PDIEVHTYPFGWYQKPIAQNNAPSFCPLVVLPSLTEKVSLDSWQSLALSS


 


VVVDPSIRHFDVAHVSTAATSNFSAVRDLCLSECSQHEACLITTLQTQPG


 


AVRCMFYADTQSCTHSLQGQNCRLLLREEATHIYRKPGISLLSYEASVPS


 


VPISTHGRLLGRSQAIQVGTSWKQVDQFLGVPYAAPPLAERRFQAPEPLN


 


WTGSWDASKPRASCWQPGTRTSTSPGVSEDCLYLNVFIPQNVAPNASVLV


 


FFHNTMDREESEGWPAIDGSFLAAVGNLIVVTASYRVGVFGFLSSGSGEV


 


SGNWGLLDQVAALTWVQTHIRGFGGDPRRVSLAADRGGADVASIHLLTAR


 


ATNSQLFRRAVLMGGSALSPAAVISHERAQQQAIALAKEVSCPMSSSQEV


 


VSCLRQKPANVLNDAQTKLLAVSGPFHYWGPVIDGHFLREPPARALKRSL


 


WVEVDLLIGSSQDDGLINRAKAVKQFEESRGRTSSKTAFYQALQNSLGGE


 


DSDARVEAAATVVYYSLEHSTDDYASFSRALENATRDYFIICPIIDMASA


 


WAKRARGNVFMYHAPENYGHGSLELLADVQFALGLPFYPAYEGQFSLEEK


 


SLSLKIMQYFSHFIRSGNPNYPYEFSRKVPTFATPWPDFVPRAGGENYKE


 


FSELLPNRQGLKKADCSFWSKYISSLKTSADGAKGGQSAESEEEELTAGS


 


GLREDLLSLQEPGSKTYSK






MeddieVax is designed to target cells expressing thyroglobulin with the following sequences.







(SEQ ID NO: 53)









GLELLLDEIYDTIFAGLDLPSTFTETTLY



 







(SEQ ID NO: 54)









RLILPQMPKALFRKKVILEDKVKNFYTRLPFQ



 







(SEQ ID NO: 55)









GLREDLLSLQEPGSKTYSK



 







(SEQ ID NO: 56)









LLLREEATHIYRKPGISLLSYEASVPSVPIST






The canonical TPO sequence is provided below.







(SEQ ID NO: 57)







MRALAVLSVTLVMACTEAFFPFISRGKELLWGKPEESRVSSVLEESKRL


 


VDTAMYATMQRNLKKRGILSPAQLLSFSKLPEPTSGVIARAAEIMETSIQ


 


AMKRKVNLKTQQSQHPTDALSEDLLSIIANMSGCLPYMLPPKCPNTCLAN


 


KYRPITGACNNRDHPRWGASNTALARWLPPVYEDGFSQPRGWNPGFLYNG


 


FPLPPVREVTRHVIQVSNEVVTDDDRYSDLLMAWGQYIDHDIAFTPQSTS


 


KAAFGGGADCQMTCENQNPCFPIQLPEEARPAAGTACLPFYRSSAACGTG


 


DQGALFGNLSTANPRQQMNGLTSFLDASTVYGSSPALERQLRNWTSAEGL


 


LRVHARLRDSGRAYLPFVPPRAPAACAPEPGIPGETRGPCFLAGDGRASE


 


VPSLTALHTLWLREHNRLAAALKALNAHWSADAVYQEARKVVGALHQIIT


 


LRDYIPRILGPEAFQQYVGPYEGYDSTANPTVSNVFSTAAFRFGHATIHP


 


LVRRLDASFQEHPDLPGLWLHQAFFSPWTLLRGGGLDPLIRGLLARPAKL


 


QVQDQLMNEELTERLFVLSNSSTLDLASINLQRGRDHGLPGYNEWREFCG


 


LPRLETPADLSTAIASRSVADKILDLYKHPDNIDVWLGGLAENFLPRART


 


GPLFACLIGKQMKALRDGDWFWWENSHVFTDAQRRELEKHSLSRVICDNT


 


GLTRVPMDAFQVGKFPEDFESCDSITGMNLEAWRETFPQDDKCGFPESVE


 


NGDFVHCEESGRRVLVYSCRHGYELQGREQLTCTQEGWDFQPPLCKDVNE


 


CADGAHPPCHASARCRNTKGGFQCLCADPYELGDDGRTCVDSGRLPRVTW


 


ISMSLAALLIGGFAGLTSTVICRWTRTGTKSTLPISETGGGTPELRCGKH


 


QAVGTSPQRAAAQDSEQESAGMEGRDTHRLPRAL






Thyroid Peroxidase is targeted with the following peptide sequences.







(SEQ ID NO: 58)









VADKILDLYKHPDNIDVWLGGLAENFLPRA



 







(SEQ ID NO: 59)









LLIGGFAGLTSTVICRWTRTGTKSTLPISE



 







(SEQ ID NO: 60)









RLRDSGRAYLPFVPPRAPAACAPEPGIPGE



 







(SEQ ID NO: 61)









QYIDHDIAFTPQSTSKAAFGGGADCQMTCE






Summary of Targeted Antigens

Table 2 summarizes the tumor-specific or tumor associated antigens targeted by MeddieVax along with the corresponding epitope(s) for each antigen.







TABLE 2





Targeted Proteins and Corresponding


Exemplary polypeptide Sequences
















Mutant
QGRIPVKWTAIESLFDHIYTT (SEQ ID NO: 2)


RET
PYKWTAIEI (SEQ ID NO: 5)



PTKWTAIEY (SEQ ID NO: 6)



RLPVKWTAL (SEQ ID NO: 7)


 


Wild-type
RENRPPGTFHQFRLLPVQFLCPNISVAYRL (SEQ ID NO: 3)


RET


 


Mutant
DGETCLLDILDTAGREEYSAMRDQYMRTG (SEQ ID NO: 12)


HRAS
DGETCLLDILDTAGKEEYSAMRDQYMRTG (SEQ ID NO: 13)



MTEYKLVVVGAGRVGKSALTIQLIQ (SEQ ID NO: 14)



VKDSDDVPMVLVGNNCDLAARTVESRQAQ (SEQ ID NO: 15)


 


Mutant
DLARSYGIPFIETSVKTRQRVEDAFYTLV (SEQ ID NO: 16)


KRAS
MTEYKLVVVGAVGVGKSALTIQL (SEQ ID NO: 18)



MTEYKLVVVGARGVGKSALTIQL (SEQ ID NO: 19)


 


Mutant
EDLTVKIGDFGLATEKSRWSGSHQFEQL (SEQ ID NO: 21)


BRAF
EDLTVKIGDFGLATKKSRWSGSHQFEQL (SEQ ID NO: 22)



GTATXKSRY (SEQ ID NO: 24)



GLATXKSRL (SEQ ID NO: 25)



GYATXKSRF (SEQ ID NO: 26)


 


Calcitonin
CTNLSTCMLGTYTQDFNKFHTFPQTAIGVAAP (SEQ ID NO:



28)


 


CEA
TYACFVSNLATGRNNSIVKSITVSASGTSP (SEQ ID NO: 30)



LIQNIIQNDTGFYTLHVIKSDLVNEEAT (SEQ ID NO: 31)



ITEKNSGLY (SEQ ID NO: 32)


 


MUC1
QRDISEMFLQIYKQGGFLGLSNIKFRPGSVVV (SEQ ID NO: 35)


 


MUC4
ESDYQIFSYPNPLPSGFT (SEQ ID NO: 36)


 


NY-ESO-1
GPESRLLEFYLAMPFATPMEAELARRSLAQ (SEQ ID NO: 38)


 


Survivin
AFLSVKKQFEELTLGEFLKLDRERAKNKIA (SEQ ID NO: 41)



AFLSVKKQFEELTLGEFLKYDRERAKNKIA (SEQ ID NO: 42)



AFLSVKKQFEELTLGEFLKIDRERAKNKIA (SEQ ID NO: 43)



AFLSVKKQFEELYLGEFLKLDRERAKNKIA (SEQ ID NO: 44)


 


IDO
PRNIAVPYCQLSKKLELPPILVYADCVLAN (SEQ ID NO: 46)


 


HLA-G
QTDRLNLQTLRGYYN (SEQ ID NO: 48)


 


Brachyury
KLNGGGQIMLNSLHKYEPRIHIVRVGGPQR (SEQ ID NO: 50)


 


Mutated
UUUUUUUUUUUUXUUUUUUUUUUUU (SEQ ID NO: 51)


Passenger


Proteins


 


Thyroglobulin
GLELLLDEIYDTIFAGLDLPSTFTETTLY (SEQ ID NO: 53)



RLILPQMPKALFRKKVILEDKVKNFYTRLPFQ (SEQ ID NO: 54)



GLREDLLSLQEPGSKTYSK (SEQ ID NO: 55)



LLLREEATHIYRKPGISLLSYEASVPSVPIST (SEQ ID NO: 56)


 


TPO
VADKILDLYKHPDNIDVWLGGLAENFLPRA (SEQ ID NO: 58)



LLIGGFAGLTSTVICRWTRTGTKSTLPISE (SEQ ID NO: 59)



RLRDSGRAYLPFVPPRAPAACAPEPGIPGE (SEQ ID NO: 60)



QYIDHDIAFTPQSTSKAAFGGGADCQMTCE (SEQ ID NO: 61)
















TABLE 3







MHC I Binding, MHC II Binding and B Cell Epitope Prediction for


MeddieVax polypeptides



















MHC II
B Cell
SEQ


Target




Binding
Epitope
ID


Protein
Sequence
HLA-A01
HLA-A02
HLA-A24
(nM)
(%)
NO:

















RET M918T
QGRIPVKWTAIE
15
25
14
631
72.5
2



SLFDHIYTT


 


RET M918T
PYKWTAIEI
1
6
19

37.4
5


 


RET M918T
PTKWTAIEY
22
2
−1

29.3
6


 


RET M918T
RLPVKWTAL
1
22
13

24.97
7


 


Wild-type
RENRPPGTFHQ
16
21
16
35
64.2
3


RET
FRLLPVQFLCP



NISVAYRL


 


Mutant
DGETCLLDILDT
19
23
10
993
74.8
12


HRAS
AGREEYSAMRD



QYMRTG


 


Mutant
DGETCLLDILDT
18
23
10
1324
72.6
13


HRAS
AGKEEYSAMRD



QYMRTG


 


Mutant
MTEYKLVVVGA
15
19
14
159
54.8
14


HRAS
GRVGKSALTIQ



LIQ


 


Mutant
VKDSDDVPMVL
15
23
13
1055
73.5
15


HRAS
VGNNCDLAART



VESRQAQ


 


Mutant
DLARSYGIPFIE
15
20
12
255
76.8
16


KRAS
TSVKTRQRVED



AFYTLV


 


Mutant
MTEYKLVVVGA
15
21
11
531
58.6
18


KRAS
VGVGKSALTIQL


 


Mutant
MTEYKLVVVGA
15
19
11
160
70.7
19


KRAS
RGVGKSALTIQL


 


Mutant
EDLTVKIGDFGL
16
17
12
1314
72.3
21


BRAF
ATEKSRWSGS



HQFEQL


 


Mutant
EDLTVKIGDFGL
11
17
12
627
73.6
22


BRAF
ATKKSRWSGS



HQFEQL


 


Mutant
GTATXKSRY
22
7
0

55.7
24


BRAF


 


Mutant
GLATXKSRL
2
23
10
36.3
25


BRAF


 


Mutant
GYATXKSRF
1
3
20

55.8
26


BRAF


 


Calcitonin
CTNLSTCMLGT
20
17
24
210
74.8
28



YTQDFNKFHTF



PQTAIGVAAP


 


CEA
TYACFVSNLAT
7
18
22
88
71
30



GRNNSIVKSITV



SASGTSP


 


CEA
LIQNIIQNDTGFY
15
20
14
70
50.1
31



TLHVIKSDLVNE



EAT


 


CEA
ITEKNSGLY
30
5
3
—
43.7
32


 


MUC1
QRDISEMFLQIY
27
19
13
107
71
35



KQGGFLGLSNI



KFRPGSVVV


 


MUC4
ESDYQIFSYPNP
30
21
12
351
78.8
36



LPSGFT


 


NY-ESO-1
GPESRLLEFYL
16
21
14
149
49.7
38



AMPFATPMEAE



LARRSLAQ


 


Survivin
AFLSVKKQFEE
13
23
19
300
93.7
41



LTLGEFLKLDRE



RAKNKIA


 


Survivin
AFLSVKKQFEE
28
17
19
384
87.6
42



LTLGEFLKYDR



ERAKNKIA


 


Survivin
AFLSVKKQFEE
13
21
19
300
87
43



LTLGEFLKIDRE



RAKNKIA


 


Survivin
AFLSVKKQFEE
18
19
25
276
88
44



LYLGEFLKLDR



ERAKNKIA


 


IDO
PRNIAVPYCQL
21
21
22
277
72.9
46



SKKLELPPILVY



ADCVLAN


 


HLA-G
QTDRLNLQTLR
20
16
10
225
64.3
48



GYYN


 


Thyroglobulin
GLELLLDEIYDT
23
25
22
589
63
53



IFAGLDLPSTFT



ETTLY


 


Thyroglobulin
RLILPQMPKAL
26
26
14
142
59.1
54



FRKKVILEDKV



KNFYTRLPFQ


 


Thyroglobulin
GLREDLLSLQE
26
30
11
1330
86.7
55



PGSKTYSK


 


Thyroglobulin
LLLREEATHIYR
24
29
20
152
61.7
56



KPGISLLSYEAS



VPSVPIST


 


TPO
VADKILDLYKH
27
23
13
1651
76.6
58



PDNIDVWLGGL



AENFLPRA


 


TPO
LLIGGFAGLTST
8
31
13
843
59.7
59



VICRWTRTGTK



STLPISE


 


TPO
RLRDSGRAYLP
16
18
14
395
61.6
60



FVPPRAPAACA



PEPGIPGE


 


TPO
QYIDHDIAFTPQ
12
20
24
685
62.7
61



STSKAAFGGGA



DCQMTCE


 


Brachyury
KLNGGGQIMLN
16
22
14
121
60.3
50



SLHKYEPRIHIV



RVGGPQR









Reservation to Modify MeddieVax Polypeptide Composition for Personalized Cancer Therapy

Tumors arising from the same cell type in different patients invariably exhibit highly distinct molecular characteristics, relating to both underlying mutations and gene expression, which drive the tumor phenotype. To a lesser degree, tumors within the same patient can exhibit such diversity. Using established methods familiar to those in the art, such as whole exome sequencing, mRNA profiling or immunohistochemical staining, the unique genomic and proteomic expression profile of a patient's tumor specimen can be reliably ascertained. In this context, the MeddieVax vaccine can be formulated, to include various combinations of the epitopes described previously, which are listed in Table 2. By design, this approach will permit tumor-specific or tumor-associated antigens, including immunosuppressive antigens to be targeted, while sparing the patient from any potential side effects related to vaccinating against epitopes absent from the patient's tumor. In one embodiment, the vaccine may include a single polypeptide, such as that for HLA-G. In another embodiment, the vaccine may include polypeptides corresponding to epitopes for calcitonin, CEA and RET M918T. In another embodiment the vaccine may include all of the polypeptides sequences found in Table 2. In general, the vaccine may include any combination of polypeptides in Table 2.
Example 2
Development of a Potent MeddieVax Adjuvant
Dendritic cells from a human donor were isolated using a Human Blood Dendritic Cell Isolation Kit from Miltenyi Biotec®. Cells were then suspended in Dulbecco's Modified Eagle's Medium with 10% FBS and diluted to a concentration of 3×106 per mL. Cells were then transferred to a sterile, flat-bottom 24 well plate and each plate was filled 0.5 mL of cell medium, corresponding to 1.5×106 cells. In triplicate, wells were spiked with combinations of the following TLR agonists: Gardiquimod (G), PolyI:C (P), and heat-killed Mycobacterium tuberculosis (C) at concentrations of 2 μg/mL, 10 μg/mL and 1 μg/mL, respectively. All seven possible combinations of the three TLR agonists were evaluated, including G, P, C, G/P, C/P, G/C and G/C/P. Of note, C is the active TLR ligand in Complete Freund's Adjuvant (CFA). After addition of the various TLR agonists, cells were incubated for 48 hours in a 5% CO2 environment at 37° C., after which time sample analysis was performed to quantify secretion of the activating cytokine IL-6 and expression of co-stimulating surface molecules CD80 and CD86.
ELISA was performed to quantify IL-6 concentration after 1:10 dilutions of each well sample (FIG. 1). After incubating cells with either FITC-conjugated anti-CD86 or FITC-conjugated anti-CD80, the relative expression of CD80 (FIG. 2) and CD86 (FIG. 3) was determined using a 10-bit CCD camera and ImageJ software, whereby the total number of counts is divided by the number of cells in each imaged field, to derive the average number of counts per cell, which is a proxy for CD80/CD86 activation marker expression. For sampling purposes, five random fields were examined for each TLR agonist combo.
Of note, the triplet cocktail of Gardiquimod+PolyI:C+Mycobacterium tuberculosis exhibited a greater increase than would be expected by purely additive effects of each TLR agonist alone, thereby implying a synergy of the triple cocktail. While CFA can be used once for prime vaccination dose, its use in subsequent boosting is not recommended. Clinical trials dating back to 1970 indicate that secondary vaccination with CFA often leads to the formation of painful sterile abscesses.
Based on these experiments, the MeddieVax priming adjuvant is comprised of a novel combination of Freund's Complete Adjuvant (CFA), gardiquimod and PolyI:C, which forms an oil-water liquid emulsion into which the immunogenic polypeptides are suspended. The MeddieVax adjuvant for the prime dose consists of G+P+CFA. As repeated vaccination with CFA is known to occasionally form sterile abscess, this can be avoided by using G+P for subsequent boosting doses, if it is deemed clinically necessary to avoid abscess formation.
Example 3
Vaccine Delivery and Dosing
The MeddieVax vaccine is formulated to be administered as an emulsion, whereby a water and oil suspension formed by polypeptides and adjuvant components (P+G) are dissolved in PBS and vigorously intermixed with CFA (prime dose) or incomplete Freund's Adjuvant (boosting doses) using the two syringe method or other methods. Such methods may include using a homogenizer, vortexer, sonicator or other mixing equipment. As one example, MeddieVax can be administered to the patient via intradermal injection in multiple body locations, which are ideally in close proximity to cervical, inguinal, mediastinal or axillary draining lymph nodes. The total dose of each polypeptide can be varied. In general, the dose of each polypeptide should be 10-10,000 micrograms with a preferred dose of 1,000 micrograms. While intradermal administration is preferred, alternate methods may be employed, including subcutaneous and intramuscular injections. Other administration methods, which do not involve the use of needles may be employed. As an example, polypeptides encapsulated in lipid-based or hydrophobic nanoparticles may be administered via oral ingestion or inhalation. The dose of each polypeptide can be varied depending on the exact method of administration.
Although certain embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a wide variety of alternate and/or equivalent embodiments or implementations calculated to achieve the same purposes may be substituted for the embodiments shown and described without departing from the scope. Those with skill in the art will readily appreciate that embodiments may be implemented in a very wide variety of ways. This application is intended to cover any adaptations or variations of the embodiments discussed herein. Therefore, it is manifestly intended that embodiments be limited only by the claims and the equivalents thereof.
Example 4
Efficacy and Immunogenicity of MeddieVax
The efficacy and immunogenicity of the disclosed MeddieVax therapeutic vaccine was empirically validated in a syngeneic murine tumor model using the p25OE MTC cell line. The experiment was conducted as follows.
Vaccine Preparation
The vaccine and adjuvant only mixture were prepared as follows. First, the following peptides were synthesized by Lifetein (Hillsborough, N.J.) at 98% purity:







(SEQ. ID NO: 2)









QGRIPVKWTAIESLFDHIYTT



and



 







(SEQ. ID NO: 28)









CTNLSTCMLGTYTQDFNKFHTFPQTAIGVAAP.






Of note, the modified calcitonin sequence (SEQ ID NO: 28) and the mutant RET sequence (SEQ ID NO: 2) both exhibit very strong sequence homology (>90%) to their respective murine sequences.

Each peptide was dissolved at a concentration of 1 mg/mL in 1 mL of PBS. The peptide solutions were then mixed together to form a 2 mL solution. After vortexing, the peptide solution containing both sequences was divided into two equal 1 mL volumes. The first volume was used to make the prime part of the vaccine and the second volume was used to make the boost. To make MeddieVax Prime, 1 mL of peptide solution was drawn into a 3 mL glass syringe and emulsified in Complete Freund's Adjuvant (Invivogen, San Diego, Calif.) by vigorously mixing using the two-syringed method, whereby a second 3 mL glass syringe was filled with 1 mL of CFA and the syringes were connected using a 23-gauge connector. The aqueous solution was injected into the CFA and then the mixture was passed back and forth for several minutes, in order to form a stable emulsion. The method yielded 2 mL of MeddieVax Prime. To make MeddieVax Boost, 1 mL of peptide solution was added to a 1 mL solution containing low molecular weight PolyI:C at 1 mg/mL and gardiquimod at 1 mg/mL, generating a 2 mL aqueous solution. This 2 mL solution was then emulsified in 2 mL of Incomplete Freund's Adjuvant (IFA) using the two-syringe method to make 4 mL of MeddieVax Boost. PolyI:C, gardiquimod and IFA were all supplied by Invivogen. Prior to injection, the vaccine and adjuvant cocktails were stored at 4° C. The adjuvant only cocktails (Adjuvant Prime and Adjuvant Boost) were manufactured using the same protocol as the vaccine (peptide plus adjuvant), except no peptides were dissolved in PBS prior to mixing with the adjuvants (CFA or PolyI:C, gardiquimod and IFA).
Expansion of Syngeneic Tumor Cells
To generate sufficient numbers of cells for inoculation, the frozen p25OE cells were thawed in a water bath and rinsed with PBS. Then the cells were expanded in 75 cm2 culture flasks in an incubator at 37° C./5% CO2 in RPMI supplemented with 10% fetal bovine serum (FBS), 20 mM of HEPES and 1 mM of sodium pyruvate and 20 mM of glucose. The cells were noted to grow in suspension, and cells were counted using a hemocytometer and trypan blue exclusion staining. A doubling time of 2-3 days was noted.
Once the cell count reached approximately 150 million, mice were inoculated to generate tumors. For the experiment, 20 female C57BL/6 mice were each injected with 5 million p25OE cells in 20% Matrigel/80% PBS in the left hind flank. The total injection volume was 200 μL per mouse.
Experimental Design and Treatment
Once tumors grew to a volume of approximately 125 mm3, 15 mice were randomized into the following three treatment groups each consisting of five mice: MeddieVax vaccine (peptide plus adjuvant), Adjuvant Alone and untreated control. The day of randomization is considered Day #1.
Treatment Regimen
Mice in the MeddieVax vaccine group were injected with MeddieVax Prime on Day #1, and then injected with MeddieVax Boost on Days 5, 9 and 15. Mice in the MeddieVax vaccine group were injected with MeddieVax Prime on Day #1, and then injected with MeddieVax Boost on Days 5, 9 and 15. Mice in the Adjuvant Alone vaccine group were injected with Adjuvant Prime on Day #1, and then injected with Adjuvant Boost on Days 5, 9 and 15. A volume of 100 μL was used for all injections, which employed a 22-gauge needle. Mice in the Control group were injected with equal volumes of PBS on days 1, 5, 9 and 15. Tumor volumes were measured 3×/week for six weeks.
Results: Vaccine Efficacy
Experimental results demonstrate that the disclosed vaccine is immunogenic and significantly inhibits tumor growth. As shown in FIG. 4, MeddieVax significantly inhibited mean tumor growth relative to the Adjuvant Alone and Control groups by 50% (p<0.01) and 62% (p<0.01), respectively. At day 44, the mean tumor volume in the MeddieVax, Adjuvant Alone and Control groups was 560, 1111, and 1480 mm3, respectively.
To evaluate the immunogenicity of the vaccine, an IFN-gamma ELISPOT assay was performed according to the manufacturer's instructions (Immunospot, Shaker Heights, Ohio). The web-based NetMHCpan 4.0 epitope prediction algorithm (http://www.cbs.dtu.dk/services/NetMHC/) was used to predict murine epitopes contained within the two peptides used for immunization. The epitopes with the strongest predicted MHC I binding affinity for each vaccination peptide were used for ELISPOT assays: TNLSTCML (calcitonin) and RIPVKWTAI (RET). For each mouse group and each peptide, assays were run in triplicate.
Mice were sacrificed on Day 45. Blood from each of the three experimental groups was pooled and peripheral blood mononuclear cells were isolated using a Ficoll-Paque gradient and centrifugation. After washing twice in PBS, cells were re-suspended in ELISPOT assay medium at a concentration of 2 million cells/mL and then plated into assay wells in 100 μL volumes (200,000 cells/well). Each of the two predicted epitopes was suspended in ELISPOT assay medium at a concentration of 10 μg/mL and then 100 μL volumes were added to each well. The cells were incubated for 24 hours and then the ELISPOT wells were developed per kit instructions. The number of spots per well, corresponding to the total number of IFN-gamma secreting cells was measured using an Immunospot Analyzer. The results are plotted TNLSTCML in FIG. 5 and RIPVKWTAI in FIG. 6. Notably, a strong immune response was present over 20 days since the final boosting vaccination for both epitopes, indicating the presence of cytotoxic T cells expanded due to therapeutic vaccination. Whereas, less than 25 spots/million cells were observed in all three triplicate wells for both control and adjuvant only groups, a peak response of 320 cells/million was observed for the TNLSTCML epitope and 600 cells/million for the RIPVKWTAI epitope, providing strong evidence that the vaccine is immunogenic, increasing the magnitude of T cell responses to each epitope by more than ten-fold.
The combined tumor growth inhibition data and ELISPOT data demonstrate the efficacy and immunogenicity of the disclosed MeddieVax vaccine in a relevant syngeneic tumor model.

## Claims

1. A method of treating a subject who has medullary thyroid cancer by administering to the subject an immunogenic composition, which comprises SEQ ID NO: 2 in a suitable carrier and/or adjuvant.

2. A method of treating a subject who has medullary thyroid cancer by administering to the subject an immunogenic composition, which consists of SEQ ID NO: 2 and SEQ. ID NO: 28 in a suitable carrier and/or adjuvant.

3. The method of claim 1, whereby SEQ ID NO: 2 may be truncated by 1, 2, 3, 4, 5, 6 or 7 amino acids at either the amino terminus or carboxy terminus.

4. A method of claim 2, whereby either SEQ ID NO: 2 and/or SEQ. ID NO: 28 may be truncated by 1, 2, 3, 4, 5, 6 or 7 amino acids at either the amino terminus or carboxy terminus.

5. A method of treating a subject who has medullary thyroid cancer by administering to the subject an immunogenic composition, which comprises cDNA or mRNA encoding SEQ. ID NO: 2.

6. A method of treating a subject who has medullary thyroid cancer by administering to the subject an immunogenic composition, which consists of cDNA or mRNA encoding SEQ. ID NO: 2 and SEQ. ID NO: 28.