| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated |  | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 9.1 |  
| E.1.2 | Level | LLT |  
| E.1.2 | Classification code | 10037160 |  
| E.1.2 | Term | Psoriatic arthritis |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| Double-Blind: To compare the efficacy of 3 regimens of abatacept vs. placebo in a 6-month double-blind study of psoriatic arthritis, as measured by the proportion of subjects achieving an ACR20 response (American College of Rheumatology 20% response) at Day 169.
 
 Open-label:
 To assess the safety and tolerability of abatacept treatment during the open-label
 extension phase (18 months after the initial 6-month, double-blind period).
 |  | 
| E.2.2 | Secondary objectives of the trial | 
| 1. To estimate the difference in proportion of subjects achieving an Investigator Global Assessment (IGA) score of clear or almost clear in each of the 3 abatacept arms compared to placebo at Day 169. 2. To estimate the difference in mean percentage change from baseline in each of the 3 abatacept arms compared to placebo in target lesion scores at Day 169.
 3. To estimate the difference in mean changes from baseline in physical and mental
 functions as measured by SF-36 in each of the 3 abatacept arms compared to placebo at Day 169
 4. To estimate the difference in proportion of subjects with a diminution in disabilities
 as measured by HAQ scores between the 3 abatacept arms placebo at Day 169.
 5. To describe the safety, tolerability, immunogenicity, and to predict the
 pharmacokinetics of each of the 3 abatacept arms using population pharmacokinetics
 (POPPK) methodology.
 
 Open-label: see section 2.3.2 of the protocol
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| 1) Signed Written Informed Consent 2) Target Population
 a) meet Classification Criteria for Psoriatic Arthritis (CASPAR) (Appendix 3)
 for a duration of disease at least 3 months
 b) prior failure of DMARD therapy (inefficacy or intolerance); if patient had
 prior failure of methotrexate, s/he must have been on at least 15 mg/week dose
 for at least 2 months
 c) if recent failure of a TNFα blockade compound (inefficacy or intolerance),
 must be washed out prior to first dose: 56 days for infliximab and 28 days for
 etanercept and adalimumab
 d) disease activity as defined by a tender joint count of ≥ 3, swollen joint count
 of ≥ 3 and clinically detectable synovitis at screening and Day 01 (prior to
 infusion)
 e) have active psoriasis with a qualifying target lesion ≥ 2 cm in diameter
 f) Must be able to have MRI performed.
 3) Age and Sex
 a) Men and women (not nursing and not pregnant) ≥ 18 years of age at the time
 of informed consent.
 b) Women of childbearing potential (WOCBP) must be using an adequate
 method of contraception to avoid pregnancy throughout the study and for up
 to 10 weeks after the last dose of investigational product in such a manner that
 the risk of pregnancy is minimized.
 |  | 
| E.4 | Principal exclusion criteria | 
| 1. Sex and Reproductive Status a) WOCBP who are unwilling or unable to use an acceptable method to avoid
 pregnancy for the entire study period and for up to 10 weeks after the last
 dose of investigational product
 b) Women who are pregnant or breastfeeding, or plan to become pregnant, or to
 start breastfeeding during the duration of the study
 c) Women with a positive pregnancy test on enrollment or prior to
 investigational product administration.
 2) Medical History and Concurrent Diseases
 a) Subjects who are scheduled for or anticipate joint replacement surgery.
 b) Subjects who have a recent history of clinically significant drug or alcohol
 abuse
 c) Concomitant illness that in the opinion of the Investigator, is likely to require
 systemic glucocorticosteroid therapy during the study (e.g.; moderate to
 severe asthma)
 d) Current symptoms of severe, progressive, or uncontrolled renal, hepatic,
 hematological, pulmonary, cardiac, neurological, ophthalmologic or cerebral
 disease. Concomitant medical conditions that in the opinion of the
 Investigator might place the subject at unacceptable risk for participation in
 this study
 e) Subjects who are unwilling or unable to have screening performed based on
 current local or country guidelines/standards to evaluate the presence of
 cancer (e.g. breast, cervical, colon, prostate, hepatocellular, gastric).
 f) Subjects with a history or current evidence of malignancies; specifically,
 subjects with:
 • a history of cancer within the last five years (other than non-melanoma
 skin cell cancers cured by local resection), or
 • evidence of current malignancy or signs of possible malignancy
 detected by screening procedures for which the workup to exclude malignancy has not been completed or malignancy cannot be excluded.
 • Female subjects who have had a manual examination or breast cancer
 imaging (mammogram, ultrasound, other method) screening study that
 is suspicious for malignancy, and in whom the possibility of
 malignancy cannot be reasonably excluded following additional
 clinical, laboratory, or other diagnostic evaluations (see Section 6.3.4).
 g) Subjects at risk for tuberculosis (TB).
 h) Subjects with any serious bacterial infection within the last 3 months, not
 treated and resolved with antibiotics, or any chronic bacterial infection (such
 as, but not limited to, chronic pyelonephritis, osteomyelitis and
 bronchiectasis)
 i) Subjects with evidence (as assessed by the Investigator) of active or latent
 bacterial or viral infections at the time of potential enrollment, including
 subjects with evidence of Human Immunodeficiency Virus (HIV).
 j) Subjects with herpes zoster or cytomegalovirus (CMV) that resolved less than
 2 months prior to signing informed consent
 k) Subject who have received any live vaccines within 3 months of the
 anticipated first dose of study medication or who will have need of a live
 vaccine at any time, during and for 3 months after the duration of the study.
 3) Physical and Laboratory Test Findings
 a) Subjects with Hepatitis B surface antigen.
 b) Subjects with Hepatitis C antibody-positive subjects who are also RIBApositive
 or PCR positive.
 c) Subjects with any of the following laboratory values:
 i. Hgb < 8.5 g/dL.
 ii. WBC < 3,000/mm3 (3 x 109/L)
 iii. Platelets < 100,000/mm3 (100 x 109/L).
 iv. Serum creatinine > 2 times upper limit of normal.
 v. Serum ALT or AST > 2 times upper limit of normal.
 vi. Any other laboratory test results that, in the opinion of the investigator,
 might place the subject at unacceptable risk for participation in this study.
 4) Prohibited Treatments and/or Therapies
 a) Subjects who are scheduled for or anticipate joint replacement surgery.
 b) Subjects who have at any time received treatment with CTLA4Ig,
 BMS-188667 (abatacept).
 c) Subjects who have received treatment with any investigational drug within 28
 days (or less than 5 terminal half-lives of elimination) of the Day 01 dose.
 d) Subjects currently receiving treatment with molecular biologic therapies.
 e) Any approved or investigational biologics.
 5) Other Exclusion Criteria
 a) Prisoners or subjects who are involuntarily incarcerated
 b) Subjects who are compulsorily detained for treatment of either a psychiatric
 or physical (eg, infectious disease) illness
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Safety outcomes include adverse events, clinically significant changes in vital signs, laboratory test abnormalities, and clinical tolerability of the drug.
 
 Efficacy:
 The primary efficacy outcome measure for this study is an ACR20 response at study Day 169.
 A secondary objective of this study is to estimate the difference in proportion of subjects who achieve an IGA sc ore of clear or almost clear in each of the 3 abatacept arms compared to placebo at Day 169.
 |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | Yes | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | Yes | 
| E.6.10 | Pharmacogenetic | Yes | 
| E.6.11 | Pharmacogenomic | Yes | 
| E.6.12 | Pharmacoeconomic | Yes | 
| E.6.13 | Others | Yes | 
| E.6.13.1 | Other scope of the trial description |  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | Information not present in EudraCT | 
| E.7.1.2 | Bioequivalence study | Information not present in EudraCT | 
| E.7.1.3 | Other | Information not present in EudraCT | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | Yes | 
| E.8.1.5 | Parallel group | Yes | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | Yes | 
| E.8.1.7.1 | Other trial design description | 
| 6 months double-blind then 18 months open-label |  | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | Yes | 
| E.8.2.3 | Other | Yes | 
| E.8.2.3.1 | Comparator description |  | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 45 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | Yes | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | Information not present in EudraCT | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned |  | 
| E.8.7 | Trial has a data monitoring committee | Yes | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 2 | 
| E.8.9.1 | In the Member State concerned months | 6 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 2 | 
| E.8.9.2 | In all countries concerned by the trial months | 6 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |