Patent Description:
The administration of an anti-TNF-alpha polypeptide composition (e.g., ENBREL™ etanercept composition (Amgen, Inc. , Thousand Oaks, California)) to a subject can produce immunogenicity against the composition (e.g., in the form of anti-drug antibodies (ADA)) in the patient. Therefore, there is a desire for an anti-TNF-alpha polypeptide composition that produces a reduced level of immunogenicity in subjects.

The invention provides a composition comprising an anti-tumor necrosis factor (TNF)-alpha polypeptide, wherein the composition produces a reduced level of immunogenicity when administered to a subject.

The anti-TNF-alpha polypeptide is etanercept, the composition produces a reduced level of immunogenicity in the subject as compared to an ENBREL™ etanercept composition with an equivalent concentration of the etanercept, and the composition is prepared by a process comprising (a) providing a mixture comprising etanercept and impurities comprising aggregates of etanercept and misfolded forms of etanercept, (b) contacting the mixture with a hydrophobic interaction chromatography (HIC) resin, such that etanercept binds to the HIC resin, and (c) eluting etanercept from the HIC resin with an elution buffer, wherein, when hydrophobic interaction high performance liquid chromatography (HI-HPLC) is performed on the composition, the composition contains a Peak <NUM> amount of about <NUM> wt.

The invention also provides the composition for use in the treatment of a disorder in which a TNF-alpha activity is detrimental in a subject wherein a therapeutically effective amount of the composition is administered to the subject.

The anti-TNF-alpha polypeptide is a polypeptide that is an extracellular ligand-binding portion of a human <NUM> kDa (p75) TNFR fused to an Fc region of a human IgG1 (etanercept).

The composition comprising the anti-TNF-alpha polypeptide produces a reduced level of immunogenicity in a subject administered the anti-TNF-alpha polypeptide as compared to a subject administered a corresponding reference drug composition with an equivalent concentration of the anti-TNF-alpha polypeptide. The anti-TNF-alpha polypeptide is a polypeptide that is an extracellular ligand-binding portion of a human p75 TNFR fused to an Fc region of a human IgG1 (etanercept), and the composition produces a reduced level of immunogenicity in the subject as compared to an ENBREL™ etanercept composition (commercially available from Amgen, Inc. , Thousand Oaks, California) with an equivalent concentration of the anti-TNF-alpha polypeptide.

A reduced level of immunogenicity resulting from the administration of the composition refers to a decreased immune response reaction against the composition when the composition is administered to the subject. For example, the decreased immune response reaction can be a reduced level of anti-drug-antibodies (ADA) (i.e., antibodies against the anti-TNF-alpha polypeptide in the administered composition). The anti-TNF-alpha polypeptide is a polypeptide that is an extracellular ligand-binding portion of a human p75 TNFR fused to an Fc region of a human IgG1 (etanercept), and the level of ADA is reduced by about <NUM>% or more (e.g., about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>% or more) or by about <NUM>-<NUM>% (e.g., about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, or a range between any of these values) as compared to the ADA level in a subject administered an ENBREL™ etanercept composition with an equivalent concentration of the anti-TNF-alpha polypeptide.

The anti-TNF-alpha polypeptide for use in the composition (etanercept) can be produced in a known manner by recombinant DNA technology in a Chinese hamster ovary ("CHO") mammalian cell expression system. Examples in the art for mammalian expression of etanercept are described in <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; and <CIT>.

The anti-TNF-alpha polypeptide can be purified by any suitable means. For example, the anti-TNF-alpha polypeptide can be purified by hydroxyapatite chromatography, gel electrophoresis, dialysis, affinity chromatography, fractionation on an ion exchange column, reverse phase HPLC, chromatography on silica, chromatography on heparin, chromatography on an anion or cation exchange resin (e.g., a polyaspartic acid column), chromatofocusing, SDS-PAGE, ammonium sulfate precipitation, and/or mixed mode chromatography (see, e.g., <CIT>), i.e., any combination thereof.

Although not wishing to be bound by any particular theory, it is believed that the reduced level of immunogenicity that is characteristic of the composition is due at least in part to the process by which the composition is purified.

The composition is prepared by a process comprising (a) providing a mixture comprising etanercept and impurities comprising aggregates of etanercept and misfolded forms of etanercept, (b) contacting the mixture with a hydrophobic interaction chromatography (HIC) resin, such that etanercept binds to the HIC resin, and (c) eluting etanercept from the HIC resin with an elution buffer. In other words, the HIC is performed in bind-elution mode (wherein the product to be purified is bound to the HIC resin and subsequently eluted from the HIC resin).

The HIC resin can be any suitable resin. Exemplary HIC resins include, but are not limited to, Phenyl Sepharose <NUM> FF (High Sub), CAPTO™ Phenyl, CAPTO™ Butyl, CAPTO™ Phenyl ImpRes, and CAPTO™ Butyl ImpRes resin.

The HIC bind-elution mode provides for the removal of impurities, such as HCP, misfolded and truncated forms of the anti-TNF-alpha polypeptide, aggregates of the anti-TNF-alpha polypeptide, and other impurities (e.g., insulin, detergents, etc.). In one embodiment, the mixture of step (a), i.e., prior to contacting the mixture with a HIC resin, contains <NUM> ng/L or less (e.g., <NUM> ng/L or less, about <NUM> ng/L or less, about <NUM> ng/L or less, about <NUM> ng/L or less, about <NUM> ng/L or less, about <NUM> ng/L or less, or about <NUM> ng/L or less) of HCP.

The anti-TNF-alpha polypeptide is eluted from the HIC resin in a manner that recovers the anti-TNF-alpha polypeptide while desirably leaving a significant proportion, preferably most or all, of the aggregates (e.g., multimers such as dimers) of anti-TNF-alpha polypeptide, as well as misfolded anti-TNF-alpha polypeptides (including anti-TNF-alpha polypeptides with scrambled regions (e.g., disulfide scrambled regions) optionally bound to other proteins), bound or adhered to the HIC resin. In such a way, a significant proportion, preferably most or all, of the aggregates (e.g., multimers such as dimers) of the anti-TNF-alpha polypeptide, as well as misfolded anti-TNF-alpha polypeptides (including anti-TNF-alpha polypeptides with scrambled regions (e.g., disulfide scrambled regions) optionally bound to other proteins), in the mixture are separated from the anti-TNF-alpha polypeptide.

The anti-TNF-alpha polypeptide can be eluted from the HIC resin, typically an HIC resin column, using any suitable elution buffer. In one embodiment, the elution buffer contains about <NUM>-<NUM> (e.g., about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, or a range between any of these values) ammonium sulfate or sodium sulfate. Alternatively, the elution buffer comprises a high concentration of salt, such as about <NUM>-<NUM> (e.g., about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, or a range between any of these values) NaCl or ammonium chloride.

Additionally, the elution buffer comprises about <NUM>-<NUM> (e.g., about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, or a range between any of these values) of a pH modifying agent, such as sodium acetate, sodium citrate, or phosphate.

The pH of the elution buffer can be about pH <NUM>-<NUM> (e.g., about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, or a range between any of these values. Preferably, the pH of the elution buffer is about <NUM>-<NUM> (e.g., about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, or a range between any of these values).

The elution buffer can have any suitable conductivity. In one embodiment, the conductivity of the elution buffer is in a range of about <NUM>-<NUM>/cm (e.g., about <NUM>/cm, about <NUM>/cm, about <NUM>/cm, about <NUM>/cm, about <NUM>/cm, about <NUM>/cm, about <NUM>/cm, or a range between any of these values). Preferably, the conductivity of the elution buffer is less than about <NUM>/cm (e.g., about <NUM>-<NUM>/cm).

The preparation process further can comprise one or more (one, two, three, four, or five) wash steps prior to the elution step. The one or more wash steps can be performed with any suitable wash buffer. In one embodiment, the wash buffer comprises about <NUM>-<NUM> (e.g., about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, or a range between any of these values) ammonium sulfate or sodium sulfate. Alternatively, the wash buffer comprises about <NUM>-<NUM> (e.g., about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, or a range between any of these values) NaCl or ammonium chloride.

Additionally, the wash buffer comprises about <NUM>-<NUM> (e.g., about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, about <NUM>, or a range between any of these values) of a pH modifying agent, such as sodium acetate, sodium citrate, or phosphate.

The pH of the wash buffer can be about pH <NUM>-<NUM> (e.g., about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, or a range between any of these values). Preferably, the pH of the wash buffer is about <NUM>-<NUM> (e.g., about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, about pH <NUM>, or a range between any of these values).

When the wash step is performed, the conductivity of the wash buffer desirably is greater than the conductivity of the elution buffer. Additionally, the molarity of the sum of the components of the wash buffer desirably is greater than the molarity of the sum of the components of the elution buffer (i.e., the molarity of the elution buffer is lower than the molarity of the wash buffer).

As a result of the HIC bind-elution mode, misfolded and aggregated forms of the anti-TNF-alpha polypeptide are removed from the solution comprising the anti-TNF-alpha polypeptide. As described in Example <NUM>, the misfolded and aggregated forms of the anti-TNF-alpha polypeptide bind to the HIC resin and then are retained in the HIC resin after elution of the anti-TNF-alpha polypeptide from the HIC resin. Therefore, the resulting composition comprising the anti-TNF-alpha polypeptide has a reduced concentration of misfolded and aggregated forms of the anti-TNF-alpha polypeptide as compared to the concentration of misfolded and aggregated forms of the anti-TNF-alpha polypeptide present in the reference drug composition.

In one embodiment, the anti-TNF-alpha polypeptide is a polypeptide that is an extracellular ligand-binding portion of a human p75 TNFR fused to an Fc region of a human IgG1 (etanercept), and the concentration of high molecular weight (HMW) compounds, typically consisting of aggregates (multimer (e.g., dimer) forms of etanercept), and/or the concentration of misfolded and aggregated forms of etanercept in the resulting composition is reduced by about <NUM>% or more (e.g., about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>% or more, or a range between any of these values) or about <NUM>-<NUM>% (e.g., about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, or a range between any of these values) as compared to the concentration of HMW compounds and/or the concentration of misfolded and aggregated forms of etanercept in the ENBREL™ etanercept composition.

When high performance liquid chromatography (HPLC), such as hydrophobic interaction HPLC (HI-HPLC), is performed on a sample of the composition, three peaks typically are observed. As described in Example <NUM>, Peaks <NUM> and <NUM> correspond to impurities, including truncated anti-TNF-alpha polypeptides (Peak <NUM>), misfolded anti-TNF-alpha polypeptides (including anti-TNF-alpha polypeptides with scrambled regions (e.g., disulfide scrambled regions) optionally bound to other proteins) (Peak <NUM>), and aggregates (e.g., multimers such as dimers) of the anti-TNF-alpha polypeptide (Peak <NUM>), while Peak <NUM> corresponds to the anti-TNF-alpha polypeptide. While <CIT> describes an HIC analysis of etanercept compositions produced according to a mixed mode chromatography method, the three peaks described therein (see, e.g., paragraph <NUM> thereof), as well as in <CIT> (see, e.g., column <NUM>, lines <NUM>-<NUM>, and <FIG> thereof) are similar to Peaks <NUM>, <NUM>, and <NUM> described herein.

The composition contains a Peak <NUM> amount of about <NUM> wt. % or less (e.g., about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, about <NUM> wt. % or less, or a range between any of these values) when HPLC is performed on a sample of the composition. Preferably, the composition contains a Peak <NUM> amount in a range of about <NUM>-<NUM> wt. % (e.g., about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, or a range between any of these values). In one embodiment, the composition contains a Peak <NUM> amount in a range of about <NUM>-<NUM> wt.

The anti-TNF-alpha polypeptide is a polypeptide that is an extracellular ligand-binding portion of a human p75 TNFR fused to an Fc region of a human IgG1 (etanercept), and the Peak <NUM> amount contained in the composition is reduced by about <NUM>% or more (e.g., about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>% or more, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>% or more) or by about <NUM>-<NUM>% (e.g., about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, about <NUM>%, or a range between any of these values) as compared to the Peak <NUM> amount contained in the ENBREL™ etanercept composition with an equivalent concentration of the anti-TNF-alpha polypeptide when the composition and the ENBREL™ etanercept composition are subjected to HPLC under the same conditions.

In another embodiment, the composition contains a Peak <NUM> amount of about <NUM> wt. % or more (e.g., about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, about <NUM> wt. % or more, or a range between any of these values) when HPLC is performed on a sample of the composition.

The preparation process also can include ion (anion or cation) exchange chromatography, affinity chromatography, virus inactivation, and the like to further purify the anti-TNF-alpha polypeptide. The ion exchange chromatography can be flow-through or bind-elute mode. Any suitable ion exchange resin can be used. Exemplary ion exchange resins (i.e., chromatographic separation mediums) include, but are not limited to, HiTrap SP Sepharose FF, HiTrap CM Sepharose FF, CAPTO™ SP Impres, HiTrap SP HP, SOURCE <NUM>, HiperCel Sorbent S, CM Ceramic Hiper D, S Ceramic Hiper D, ESHMUNO S, FRACTOGEL™ EMD S (M), FRACTOGEL™ EMD S (S), FRACTOGEL™ EMD SE HiCap resin, FRACTOGEL™ TMEA HiCap, Nuvia S, UNOsphere S, Macro-Prep CM, and Macro-Prep S resin.

Thus, in one embodiment, the preparation process additionally comprises steps (a1)-(a4), which are performed prior to step (b) (contacting the mixture with the HIC resin): (a1) contacting the mixture with an ion (e.g., cation or anion) exchange resin in the presence of a load buffer, (a2) collecting a flow-through fraction containing the anti-TNF-alpha polypeptide, wherein the anti-TNF-alpha polypeptide is unbound to the ion exchange resin, (a3) applying a wash buffer and collecting a wash fraction, and (a4) pooling the flow-through fraction and the wash fraction.

Example <NUM> provides an exemplary description of the anti-TNF-alpha polypeptide purification process.

The composition can contain any suitable amount of the anti-TNF-alpha polypeptide. In one embodiment, the composition comprises about <NUM>/mL to about <NUM>/mL (e.g., about <NUM>/mL, about <NUM>/mL, about <NUM>/mL, about <NUM>/mL, about <NUM>/mL, about <NUM>/mL, about <NUM>/mL, about <NUM>/mL, or a range between any of these values) of anti-TNF-alpha polypeptide. Preferably, the composition comprises about <NUM>/mL of anti-TNF-alpha polypeptide.

The composition of anti-TNF-alpha polypeptide also can comprise a carrier, such as a pharmaceutically acceptable carrier or excipient that is conventional in the art and which is suitable for administration into a subject for therapeutic, diagnostic, or prophylactic purposes. The term "composition" (e.g., pharmaceutical composition) refers to a composition comprising an anti-TNF-alpha polypeptide prepared such that it is suitable for injection and/or administration into a subject in need thereof. In certain embodiments, the compositions provided herein are substantially sterile and do not contain any agents that are unduly toxic or infectious to the recipient. Further, as used herein, a solution or aqueous composition may mean a fluid (liquid) preparation that contains one or more chemical substances dissolved in a suitable solvent (e.g., water and/or other solvent, e.g., organic solvent) or mixture of mutually miscible solvents.

Such pharmaceutically acceptable carriers and excipients include, but are not limited to, additives that stabilize the polypeptide while in solution (or in dried or frozen forms), polymers, amino acids, surfactants, buffers, and combinations thereof. Suitable pharmaceutically acceptable carriers and excipients include, but are not limited to water, buffers (e.g., sodium phosphate, histidine, potassium phosphate, sodium or potassium citrate, maleic acid, ammonium acetate, tris-(hydroxymethyl)-aminomethane (tris), acetate, diethanolamine, or a combination thereof), sugars (e.g., sucrose, lactose, glycerol, xylitol, sorbitol, mannitol, maltose, inositol, trehalose, glucose, or a combination thereof), polymers (e.g., bovine serum albumin (BSA), human SA or recombinant HA, dextran, polyvinyl alcohol (PVA), hydroxypropyl methylcellulose (HPMC), polyethyleneimine, gelatin, polyvinylpyrrolidone (PVP), hydroxyethylcellulose (HEC)), non-aqueous solvents (e.g., polyethylene glycol, ethylene glycol, glycerol, dimethysulfoxide (DMSO) and dimethylformamide (DMF)), amino acids (e.g., proline, L-serine, sodium glutamic acid, alanine, glycine, lysine hydrochloride, sarcosine, gamma-aminobutyric acid), surfactants (e.g., TWEEN™-<NUM>, TWEEN™-<NUM>, SDS, polysorbate, and polyoxyethylene copolymer), and miscellaneous excipients (e.g., potassium phosphate, sodium acetate, ammonium sulfate, magnesium sulfate, sodium sulfate, trimethylamine N-oxide, betaine, zinc ions, copper ions, calcium ions, manganese ions, magnesium ions, CHAPS, sucrose monolaurate, <NUM>-O-beta-mannoglycerate or a combination thereof.

The concentration of one or more carriers or excipients in the composition is about <NUM> wt. % to about <NUM> wt. % (e.g., about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, about <NUM> wt. %, or a range between any of these values).

In one embodiment, the composition comprises sucrose at a concentration of from about <NUM> wt. % to about <NUM> wt. % (e.g., <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, <NUM> wt. %, or a range between any of these values) and preferably about <NUM> wt. The composition alternatively or additionally can comprise sodium phosphate at a concentration of about <NUM>-<NUM> (e.g., <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or a range between any of these values) and preferably about <NUM>. The composition alternatively or additionally can comprise sodium chloride at a concentration of about <NUM>-<NUM> (e.g., <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or a range between any of these values) and preferably about <NUM>.

The composition can have any suitable pH. For example, the composition can have a pH of about <NUM> to about <NUM> and preferably has a pH of about <NUM> to about <NUM> (e.g., a pH of <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or a range between any of these values). In one embodiment, the composition has a pH of <NUM>.

In one embodiment, the composition comprises, consists essentially of, or consists of a composition comprising about <NUM>/mL of anti-TNF-alpha polypeptide, about <NUM> sodium phosphate, about <NUM> sodium chloride, and about <NUM> wt. % sucrose at a pH of about <NUM>.

The composition is suitable for administration to a subject by any suitable mode of administration including, but not limited to, oral, aerosol, parenteral (e.g., subcutaneous, intravenous, intraarterial, intramuscular, intradermal, interperitoneal, introcerebrospinal, intrasynovial, and intrathecal), rectal, and vaginal administration. Parenteral administration can be by bolus injection or continuous infusion. Compositions for injection may be presented in unit dosage form, e.g., in ampoules or in multi-dose containers, with an added preservative.

Additionally, the composition is suitable or administration using Inject-ease GENJECT™ injector, injector pens such as the GENPEN™ injector pen, and needleless devices such as the MEDIJECTOR™ device and the BIOJECTOR™ device. In one embodiment, the composition is suitable for parental administration and is packaged in a pre-filled syringe. Preferably, the composition is suitable for subcutaneous injection.

In another embodiment, the composition is formulated as a depot preparation. Such long acting compositions may be administered by implantation (for example subcutaneously or intramuscularly) or by intramuscular injection. Thus, for example, the composition can be modified with suitable polymeric or hydrophobic materials (e.g., as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt.

In yet another embodiment, the composition is presented in a vial, pack, or dispenser device that contains one or more unit dosage forms containing the anti-TNF-alpha polypeptide. The dispenser device can comprise a syringe having a single dose of the liquid composition ready for injection. The syringe can be accompanied by instructions for administration. The invention also provides a kit or container that comprises the composition (e.g., in aqueous form). The kit also can be accompanied by instructions for use.

The subject to be administered the composition can be any suitable subject. The subject can be a mammal, such as a mouse, rat, guinea pig, hamster, rabbit, cat, dog, pig, cow, horse, or primate (e.g., human). In one embodiment, the subject has, or is at risk for having, a disorder in which TNF-alpha activity is detrimental.

In this regard, it is disclosedthe composition for use for the treatment of a disorder in which TNF-alpha activity is detrimental in a subject wherein a therapeutically effective amount of the composition is administered to the subject.

The disorder in which TNF-alpha activity is detrimental in a subject includes, but is not limited to, rheumatoid arthritis, plaque psoriasis, psoriatic arthritis, polyarticular juvenile idiopathic arthritis (JIA), ankylosing spondylitis, Wegener's disease (granulomatosis), Crohn's disease (or inflammatory bowel disease), chronic obstructive pulmonary disease (COPD), hepatitis C, endometriosis, asthma, cachexia, psoriasis, or atopic dermatitis, or other inflammatory or autoimmune-related illness, disorder, or condition. Additional disorders that can be treated with the anti-TNF-alpha polypeptide are described in International Patent Application Publication <CIT>, International Patent Application Publication <CIT>, and <CIT>.

According to the present invention, the composition is for use in the treatment of a disorder selected from the group consisting of polyarticular JIA, psoriatic arthritis, plaque psoriasis, and ankylosing spondylitis or it is for use in the treatment of rheumatoid arthritis.

The term "treating" refers to administration or application of remedies for a disorder in a subject and includes inhibiting the disorder, arresting development of the disorder, relieving the disorder (for example, by causing regression, or restoring or repairing a lost, missing, or defective function) or stimulating an inefficient process. The term includes obtaining a desired pharmacologic and/or physiologic effect and covering any treatment of a pathological condition or disorder in a subject. The term encompasses a therapeutic effect in terms of a partial or complete cure for a disorder and/or adverse effect attributable to the disorder. Treating includes inhibiting the disorder, such as arresting its development, stopping or terminating the disorder or at least its associated symptoms, so that the subject no longer suffers from the disorder or its symptoms, such as causing regression of the disorder or its symptoms, for example, by restoring or repairing a lost, missing or defective function, or stimulating an inefficient process, or relieving, alleviating or ameliorating the disorder, or symptoms associated therewith, where ameliorating is used in a broad sense to refer to at least a reduction in the magnitude of a parameter, such as inflammation, pain and/or tumor size.

Administration of the composition to a subject can also be prophylactic. The term "preventing" encompasses complete or partial prevention of a disorder or symptom thereof, i.e., preventing the disorder from occurring or recurring in a subject who may be predisposed to the disorder but is not yet symptomatic.

The appropriate dosage, or therapeutically effective amount, of the anti-TNF-alpha polypeptide will depend on the condition to be treated, the severity of the condition, prior therapy, and the subject's clinical history and response to the anti-TNF-alpha polypeptide. The proper dose can be adjusted according to the judgment of the attending physician such that it can be administered to the subject one time or over a series of administrations. The composition can be administered as a sole therapeutic or in combination with additional therapies as needed.

In certain embodiments, the effective anti-TNF-alpha polypeptide amount per adult dose ranges from about <NUM>-<NUM>/m<NUM>, or from about <NUM>-<NUM>/m<NUM>, or from about <NUM>-<NUM>/m<NUM> (e.g., about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, about <NUM>/m<NUM>, or a range between any of these values) or about <NUM>-<NUM>/m<NUM>. Alternatively, one dose can be administered, whose amount can range from <NUM>-<NUM>/dose, <NUM>-<NUM>/dose, or from about <NUM>-<NUM>/dose (e.g., about <NUM>/dose, about <NUM>/dose, about <NUM>/dose, about <NUM>/dose, about <NUM>/dose, about <NUM>/dose, about <NUM>/dose, about <NUM>/dose, or a range between any of these values). If the dose is to be administered more than one time per week, an exemplary dose range is the same as the foregoing described dose ranges or lower and preferably administered two or more times per week at a per dose range of <NUM>-<NUM>/dose.

In other embodiments, an acceptable dose for administration by injection contains about <NUM>-<NUM>/dose (e.g., about <NUM>/dose, about <NUM>/dose, or about <NUM>/dose). The dose can be administered at biweekly, weekly doses, or separated by several weeks (for example <NUM> to <NUM> weeks, e.g., <NUM> weeks, <NUM> weeks, <NUM> weeks, <NUM> weeks, <NUM> weeks, <NUM> weeks, or <NUM> weeks).

In some instances, an improvement in an subject's disorder can be obtained by a dose of up to about <NUM> of the composition one to three times per week over a period of at least three weeks, though treatment for longer periods may be necessary to induce the desired degree of improvement. For incurable chronic conditions the regimen may be continued indefinitely. For pediatric individuals (ages <NUM>-<NUM>), a suitable regimen involves a dose of about <NUM>/kg to <NUM>/kg (about <NUM>/kg, about <NUM>/kg, <NUM>/kg, about <NUM>/kg, about <NUM>/kg, about <NUM>/kg, about <NUM>/kg, about <NUM>/kg, or a range between any of these values) of the anti-TNF-alpha polypeptide, administered one or more times per week.

The composition can be administered to the subject alone or in combination (e.g., sequential or simultaneous administration) with another active agent, such as infliximab (REMICADE™), etanercept (ENBREL™), adalimumab (HUMIRA™), certolizumab (CIMZIA™), golimumab (SIMPONI™), methotrexate (MTX), or combinations thereof.

This example describes a procedure for the preparation, particularly purification, of an SB4 etanercept composition, with a lower concentration of impurities (e.g., HCP and/or high molecular weight compounds (HMW), such as aggregates of etanercept, as well as misfolded forms of etanercept (mainly consisting of incorrect intra- or inter-disulfide bonds or aggregates) than the ENBREL™ etanercept composition.

The purification process comprises hydrophobic interaction chromatography (HIC), as well as possibly one or more of the following steps: ion (anion or cation) exchange chromatography, affinity chromatography, virus inactivation, and the like.

HIC is performed for removal of impurities such as HCP, Protein A leachates, misfolded and truncated forms, and aggregates. A resin such as Phenyl Sepharose <NUM> FF (high sub) can be used as the chromatographic separation medium and operated in bind-elute mode.

HIC can include one or more of the following steps: an equilibration step, a load step, a wash step, and an elution step.

The equilibration step equilibrates the resin to specified pH and osmolality to enable SB4 etanercept to bind. A buffer containing, for example, (a) about <NUM>-<NUM> ammonium sulfate or sodium sulfate or about <NUM>-<NUM> NaCl or ammonium chloride and (b) about <NUM>-<NUM> (e.g., <NUM>-<NUM>) sodium acetate, sodium citrate, or phosphate, pH <NUM>-<NUM>, can be used.

The load step applies the SB4 etanercept mixture to the column allowing SB4 etanercept to bind while some impurities flow through.

To remove truncated forms of SB4 etanercept (HIC Peak <NUM>), a wash step is carried out after the column is loaded. The wash step removes truncated forms of etanercept (HIC Peak <NUM>) while retaining the target product (HIC Peak <NUM>). The wash buffer can comprise (a) about <NUM>-<NUM> or about <NUM>-<NUM> NaCl or ammonium chloride and (b) about <NUM>-<NUM> sodium acetate, sodium citrate, or phosphate and have a pH of about <NUM>-<NUM>.

The elution step elutes SB4 etanercept from the adsorbent with, for example, an elution buffer, while retaining process- and product-related impurities (HIC Peak <NUM>) on the adsorbent. Reducing the osmolality during the elution phase allows SB4 etanercept to be collected in the effluent. Multimer forms of entanercept (HMW) and misfolded and aggregated forms of etanercept, both of which correspond to HIC Peak <NUM>, remain bound to the HIC resin. The elution buffer can contain (a) about <NUM>-<NUM> ammonium sulfate or sodium sulfate or about <NUM>-<NUM> NaCl or ammonium chloride and (b) about <NUM>-<NUM> sodium acetate, sodium citrate, or phosphate and have a pH of about pH <NUM>-<NUM> and a conductivity of about <NUM>-<NUM>/cm.

Following the purification process, the SB4 etanercept composition has lower levels of impurities as compared to the ENBREL™ etanercept composition as shown in Table <NUM>. In particular, the SB4 etanercept composition has a lower concentration of high molecular weight compounds (HMW) (mainly consisting of multimer forms of etanercept and aggregates) and a lower concentration of misfolded or aggregated forms of etanercept (mainly consisting of incorrect intra- or inter-disulfide bonds or aggregates) (Peak <NUM>) as compared to the ENBREL™ etanercept composition when HPLC is performed.

By following the foregoing purification steps, and the SB4 etanercept composition immediately following HIC can have a Peak <NUM> amount in the range of about <NUM>-<NUM> wt. % (e.g., about <NUM>-<NUM> wt. %), while the final SB4 etanercept composition can have a Peak <NUM> amount in the range of about <NUM>-<NUM> wt. The results of size-exclusion (SE)-HPLC and hydrophobic interaction (HI)-HPLC analyses performed on a SB4 etanercept composition prepared using the foregoing purification process and commercially available ENBREL™ etanercept compositions are set forth in Table <NUM>.

This example provides materials and methods for the study described in Example <NUM>.

Patients aged <NUM>-<NUM> years who have been diagnosed with rheumatoid arthritis (RA) according to the revised <NUM> American College of Rheumatology (ACR) criteria for ≥ <NUM> months and ≤ <NUM> years prior to screening were eligible for the study. Patients had to have active disease defined as: ≥ <NUM> swollen and ≥ <NUM> tender joints and either erythrocyte sedimentation rate (ESR) ≥ <NUM>/h or serum C-reactive protein (CRP) ≥ <NUM>/dL despite MTX treatment for ≥ <NUM> months (stable dose of <NUM>-<NUM>/week for ≥ <NUM> weeks prior to screening). Non-steroidal anti-inflammatory drugs and oral glucocorticoids (equivalent to ≤ <NUM> prednisolone) were permitted if received at a stable dose for ≥ <NUM> weeks prior to randomisation.

Major exclusion criteria consisted of previous treatment with any biological agents, history of lymphoproliferative disease, congestive heart failure (New York Heart Association Class III/IV), or demyelinating disorders, diagnosis of active tuberculosis (TB), and pregnancy or breastfeeding at screening.

This Phase III, randomised, double-blind, parallel group study was conducted at <NUM> centers across <NUM> countries in Europe, Latin America, and Asia. Patients were randomized in a <NUM>:<NUM> ratio to receive <NUM> of either SB4 etanercept composition or ENBREL™ etanercept composition (ETN) once-weekly for up to <NUM> weeks via subcutaneous selfadministration. All patients had to take methotrexate (MTX) (<NUM>-<NUM>/week) and folic acid (<NUM>-<NUM>/week) during the study. This report represents efficacy data up to <NUM> weeks of treatment and safety data up to the <NUM>-week interim report data cut off point (July <NUM>, <NUM>).

The primary endpoint was to demonstrate equivalence between SB4 and ETN etanercept compositions at Week <NUM>, in terms of ACR20 response rate. Other efficacy endpoints were the ACR50 and ACR70 responses, change in the disease activity score based on a <NUM> joint count (DAS28), and the EULAR response. Safety endpoints included incidence of adverse events (AEs) and serious adverse events (SAEs).

Blood samples for PK analyses were collected from a subset of patients (PK population) at designated study sites. Key PK endpoints included serum trough concentration (Ctrough) and area under the concentration-time curve during the dosing interval (AUCτ) at steady state. Serum concentrations were determined using a validated enzyme-linked immunosorbent assay (ELISA) and PK parameters were calculated by non-compartmental analyses (WinNonlin version <NUM> or higher, Pharsight, Mountain View, CA).

Immunogenicity endpoints were incidence of anti-drug antibodies (ADAs) and neutralizing antibodies (NAbs). A single assay approach with SB4 etanercept tag was used to assess immunogenicity. ADAs were measured using validated electrochemiluminesence (ECL) immunoassays (MesoScale Discovery [MSD] platform) and NAbs were measured using a competitive ligand-binding assay.

Sample size was determined using the historical data for the equivalence test. The expected ACR20 response rate at Week <NUM> for both SB4 and ETN etanercept compositions was expected to be <NUM>% from the previous ETN etanercept composition pivotal studies (<NPL>); <NPL>); and<NPL>)). Based on the expected response rate, the equivalence margin of [-<NUM>%, <NUM>%] at Week <NUM> for ACR20 response rate was calculated in line with the FDA Guidance for Industry Non-Inferiority Clinical Trials and CHMP Guideline on the Choice of the Non-inferiority Margin and was also accepted by the regulatory agencies (<NPL>); and <NPL> (February <NUM>, <NUM>).

Given a two-sided α level of <NUM> and <NUM>% power, the two-sided <NUM>% equivalence margin required <NUM> patients for the per-protocol set (PPS). Assuming <NUM>% loss of patients from the PPS, the study required a minimum of <NUM> randomized patients.

The primary efficacy analysis for ACR20 response at Week <NUM> was performed on the PPS in which patients completed Week <NUM> visit, received <NUM>-<NUM>% of both the expected number of IP injections and the expected sum of MTX doses, and did not have any major protocol deviations affecting the efficacy assessment. To declare the equivalence between the two treatment groups, the <NUM>% confidence interval (CI) of the adjusted treatment difference had to be entirely contained within the equivalence margin of [-<NUM>%, <NUM>%]. The <NUM>% CI of the difference of ACR20 response rates was estimated non-parametrically using the Mantel-Haenszel weights for region while adjusting for the baseline CRP. As a sensitivity analysis, the same analysis was repeated for the full analysis set (FAS) with missing data at Week <NUM> considered as non-responses to explore the robustness of the results. Similar analyses were performed for ACR50 and ACR70 responses at Week <NUM>.

In addition, the exponential time-response model for ACR20 response rate was used to investigate the treatment difference during the time course of the study up to Week <NUM> (<NPL>)). Each exponential time-response model for ACR20 response rate was fitted by the non-linear mixed model for SB4 and ETN etanercept compositions separately, and the difference of those models and the <NUM>% CI were calculated using the <NUM>-norm criterion which measured the squared differences across all timepoints. To declare the equivalence between two treatment groups using the time-response models, the upper limit of <NUM>% CI of the difference between the models had to be less than the pre-specified equivalence margin, which was calculated from the historical data using the <NUM>-norm criterion (<NPL>)).

Safety and immunogenicity endpoints were analysed descriptively on the safety set which included all patients who received at least one dose of study drug. PK endpoints were summarised descriptively on the PK population which included patients in the safety set who had at least one PK sample collected.

The analyses were performed using SAS version <NUM> software (SAS Institute, Cary, North Carolina, USA).

This example describes a randomized, double-blind, parallel group, multicenter study.

The efficacy, safety, and immunogenicity of SB4 etanercept composition prepared using the process described in Example <NUM> were compared to those of ENBREL™ etanercept product (ETN) in patients with moderate to severe RA despite MTX treatment.

Patient screening began in June <NUM>, and the <NUM>-week evaluation of the last patient occurred in April <NUM>. Overall, <NUM> patients were screened, of whom <NUM> patients were randomized. A total of <NUM> patients completed <NUM> weeks of treatment and <NUM> (<NUM>%) patients were included in the PPS (<NUM> patients were excluded from the PPS due to protocol deviations) (see Table <NUM>).

Patients withdrew before Week <NUM> mainly due to AEs (<NUM>%) and withdrawal of consent (<NUM>%) (see <FIG>). The demographic and baseline disease characteristics were comparable between treatment groups (see Table <NUM>).

BMI, body mass index; DAS28, disease activity score based on <NUM> joint count; ETN, reference product etanercept; HAQ-DI, health assessment questionnaire-disability index; MTX, methotrexate; SD, standard deviation; VAS, visual analogue scale.

The ACR20 response rate at Week <NUM> in the PPS was <NUM>% for SB4 etanercept composition and <NUM>% for ETN etanercept composition. The <NUM>% CI of the adjusted difference (SB4 - ETN) in ACR20 response rate was within the pre-defined equivalence margin of [-<NUM>%, <NUM>%] in both the PPS (<NUM>% CI: -<NUM>%, <NUM>%) and FAS (<NUM>% CI: -<NUM>%, <NUM>%), indicating therapeutic equivalence between SB4 and ETN etanercept compositions (see <FIG>). The time-response models of SB4 and ETN etanercept compositions up to Week <NUM> in the PPS were estimated to be equivalent since the treatment difference in terms of the <NUM>-norm difference was <NUM> and the <NUM>% CI was (-<NUM>, <NUM>), where the upper limit <NUM> was less than the pre-specified equivalence margin of <NUM> (see <FIG>).

The ACR50 and ACR70 response rates at Week <NUM> in the PPS and FAS were equivalent between SB4 and ETN etanercept compositions. The ACR50 response rate was <NUM>% vs. <NUM>% and the ACR70 response rate was <NUM>% vs. <NUM>% in the PPS for SB4 and ETN etanercept compositions, respectively (see <FIG>).

Subgroup analyses on the ACR response rates in PPS showed comparable results regardless of ADA status. The proportion of patients who achieved ACR20 response rate among patients who tested negative for antibodies against etanercept was <NUM>% for the SB4 etanercept composition and <NUM>% for the ETN etanercept composition (<NUM>% CI: -<NUM>%, <NUM>%) (see Table <NUM>).

The mean improvement in DAS28 (ESR) score from baseline was <NUM> and <NUM> at Week <NUM> for the SB4 and ETN etanercept compositions, respectively (<NUM>% CI: -<NUM>, <NUM>) (see <FIG>). The proportion of patients achieving good or moderate EULAR response (see <FIG>), low disease activity score, or remission (see <FIG>) at Week <NUM> according to DAS28 were similar between SB4 and ETN etanercept compositions. The ACR-N at Week <NUM> was <NUM>% for the SB4 etanercept composition and <NUM>% for the ETN etanercept composition. The area under the curve (AUC) of ACR-N up to Week <NUM> (<NUM> vs. <NUM>) and change in DAS28 from baseline up to Week <NUM> (<NUM> vs. <NUM>) were comparable between SB4 and ETN etanercept compositions.

The primary endpoint at Week <NUM> was met: the <NUM>% CI of the adjusted treatment difference between the SB4 and ETN etanercept compositions in ACR20 response rate was within the pre-defined equivalence margin of [-<NUM>%, <NUM>%]. The ACR20 responses observed in this study (<NUM>% for the SB4 etanercept composition and <NUM>% for the ETN etanercept composition in FAS) were within the range of ACR20 response rates reported in pivotal studies with the ETN etanercept composition (<NUM>% in <NPL>), <NUM>% in <NPL>), <NUM>% in<NPL>), <NUM>% in <NPL>), and <NUM>% in <NPL>)).

As the primary efficacy assessment (ACR20 response at Week <NUM>) was evaluated at a time point in the therapeutic plateau, various efficacy endpoints and statistical methods were applied to detect any non-equivalence in efficacy and to support the robustness of the primary efficacy analysis. The ACR20 response rate, ACR-N, and DAS28 were measured at several different time points early in the treatment period. The time-response curves for the SB4 and ETN etanercept compositions up to Week <NUM> showing the ACR20 response over time were estimated to be equivalent and the AUC of ACR-N up to Week <NUM> and AUC of the change in DAS28 (ESR) from baseline up to Week <NUM> were comparable between the SB4 and ETN etanercept compositions indicating that the efficacy of the SB4 etanercept composition over time was similar to the efficacy of the ETN etanercept composition over time.

Overall, <NUM> (<NUM>%) patients treated with the SB4 etanercept composition and <NUM> (<NUM>%) patients treated with the ETN etanercept composition reported at least one TEAE. Frequently occurring TEAEs by preferred term are shown in Table <NUM> and the most frequently reported TEAE were upper respiratory tract infection (<NUM>%) and alanine aminotransferase increased (<NUM>%) for the SB4 etanercept composition and injection site erythema (<NUM>%), upper respiratory tract infection (<NUM>%), and nasopharyngitis (<NUM>%) for the ETN etanercept composition. Most of the TEAEs were mild to moderate in severity and TEAEs considered related to the study drug were reported in <NUM> (<NUM>%) and <NUM> (<NUM>%) patients for the SB4 and ETN etanercept compositions, respectively. Serious TEAEs were reported in <NUM> patients for each of the SB4 and ETN etanercept compositions and <NUM> patients discontinued treatment due to TEAE (<NUM> [<NUM>%] patients vs. <NUM> [<NUM>%] patients).

A total of <NUM> patients (<NUM> patients for the SB4 etanercept composition and <NUM> patients for the ETN etanercept composition) were diagnosed at screening with latent TB but entered the study while receiving treatment for latent TB. None of these patients or any other patients developed active TB during the study. Other serious infections were reported in <NUM> (<NUM>%) patient treated with the SB4 etanercept composition and <NUM> (<NUM>%) patients treated with the ETN etanercept composition. Malignancies were reported in <NUM> (<NUM>%) patients treated with the SB4 etanercept composition (basal cell carcinoma, breast cancer, and lung cancer metastatic) and in <NUM> (<NUM>%) patient treated with the ETN etanercept composition (invasive ductal breast carcinoma).

Injection site reactions, counted by the high-level group term of administration site reaction, occurred in fewer patients treated with the SB4 etanercept composition compared to the ETN etanercept composition. There were <NUM> injection site reaction reported in <NUM> (<NUM>%) patients vs. <NUM> injection site reactions reported in <NUM> (<NUM>%) patients treated with the SB4 and ETN etanercept compositions, respectively. Most of the injection site reactions occurred early (between Week <NUM> and Week <NUM>) and were mild in severity and none led to study drug discontinuation. The proportion of injection site reactions for the SB4 and ETN etanercept compositions were <NUM>% vs. <NUM>% in ADA positive patients and <NUM>% vs. <NUM>% in ADA negative patients, respectively (see Table <NUM>).

Overall, the safety profile of the SB4 etanercept composition was comparable with that of the ETN etanercept composition and was similar to those observed in the pivotal trials with the ETN etanercept composition. There were no cases of active tuberculosis, and only <NUM> patient treated with the SB4 etanercept composition and <NUM> patients treated with the ETN etanercept composition reported serious infection which is lower than <NUM>% shown in ETN etanercept composition product information (<NPL>). Malignancies were reported in <NUM> (<NUM>%) patients treated with the SB4 etanercept composition and <NUM> (<NUM>%) patients treated with the ETN etanercept composition. The incidence of malignancy observed in this study is similar to the previously conducted studies (<NPL>); <NPL>); and <NPL>)).

Interestingly, injection site reactions were reported in fewer patients treated with the SB4 etanercept composition compared to the ETN etanercept composition (<NUM>% vs. <NUM>%). The overall incidence of injection site reaction occurred in this study (<NUM>%) is in line with previously conducted studies, and most injection site reactions occurred in the first month which is in accordance with the reference product label (<NPL>). There appears to be no correlation between injection site reaction and ADA development, which is consistent with previously conducted studies (<NPL>)).

PK analyses were performed on <NUM> patients (<NUM> patients treated with the SB4 etanercept composition and <NUM> patients treated with the ETN etanercept composition).

Ctrough were comparable at each time point for the SB4 etanercept composition (ranging from <NUM> to <NUM>µg/mL in Weeks <NUM> to <NUM>) and the ETN etanercept composition (ranging from <NUM> to <NUM>µg/mL in Weeks <NUM> to <NUM>) (see <FIG>). The AUCτ at Week <NUM> was <NUM> vs. <NUM>µg/mL and the inter-subject variability (CV%) was <NUM>% vs. <NUM>% for the patients treated with the SB4 and ETN etanercept compositions, respectively (see <FIG>).

In this study Ctrough and steady state PK were investigated in a subset of population to provide supporting evidence to the Phase I comparative PK study in healthy subjects that demonstrated similar PK behavior. In the Phase III study, the Ctrough values were comparable between the SB4 and ETN etanercept compositions at each time point and AUCτ at steady state was relatively higher for the SB4 etanercept composition compared to the ETN etanercept composition; however the numerical difference is likely due to an inherent high inter-subject variability (<NUM>% vs. <NUM>%).

The incidence of ADA was significantly lower in patients treated with the SB4 etanercept composition compared to the ETN etanercept composition. Two (<NUM>%) patients treated with the SB4 etanercept composition and <NUM> (<NUM>%) patients treated with the ETN etanercept composition tested positive at least once up to Week <NUM> (p < <NUM>), and only one sample from the ETN group had neutralizing capacity. The ADAs appeared early (between Week <NUM> and Week <NUM>) and most of the ADAs disappeared after Week <NUM>.

The characteristics of antibodies detected in this study were generally transient and non-neutralizing which is in accordance with those established with the ETN etanercept composition in previous studies of Product Characteristics: www. eu/docs/ en_GB/document_library/EPAR_-_Product_Information/human/<NUM>/WC500027361. pdf (retrieved on February <NUM>, <NUM>); and <NPL>)). Since SB4 etanercept tagged single assay approach was used to detect immunogenicity, the assay method does not seem to have caused the lower incidence of ADA observed in patients treated with the SB4 etanercept composition compared to the ETN etanercept composition (<NUM>% vs. <NUM>%). The lower immunogenicity of the SB4 etanercept composition does not preclude classification as biosimilar because clinical efficacy of the SB4 and ETN etanercept compositions were equivalent in patients with ADA negative results and no apparent correlation between ADA and clinical response or safety was observed (European Medicines Agency, Guideline on similar biological medicinal products containing biotechnology-derived proteins as active substance: non-clinical and clinical issues (EMEA/CHMP/BMWP/<NUM>/<NUM>) (February <NUM>, <NUM>), www. eu/docs/en_GB/ document_library/Scientific_guideline/<NUM>/<NUM>/WC500003920. pdf (retrieved on February <NUM>, <NUM>); and <NPL>)).

Claim 1:
A composition comprising an anti-tumor necrosis factor (TNF)-alpha polypeptide,
wherein the anti-TNF-alpha polypeptide is etanercept,
wherein the composition is prepared by a process comprising:
(a) providing a mixture comprising etanercept and impurities comprising aggregates of etanercept and misfolded forms of etanercept,
(b) contacting the mixture with a hydrophobic interaction chromatography (HIC) resin, such that etanercept binds to the HIC resin, and
(c) eluting etanercept from the HIC resin with an elution buffer, thereby obtaining the composition comprising etanercept
wherein said composition produces a reduced level of immunogenicity in the subject as compared to an ENBREL™ etanercept composition with an equivalent concentration of the etanercept, and
wherein, when hydrophobic interaction high performance liquid chromatography (HI-HPLC) is performed on the composition, the composition contains a Peak <NUM> amount of about <NUM> wt.% or less.