Please select the eligibility criteria that correspond to the clinical trial below.
Title: An Exploratory Phase 2a, Randomized, Double-blind, Placebo-controlled, Multicenter Study To Assess Mechanism Of Action (Moa) Of Cp-690,550 In The Skin When Administered Orally At 10 Mg Twice Daily (Bid) For 12 Weeks In Subjects With Moderate To Severe Chronic Plaque Psoriasis
Brief Summary: There are cells in the skin and blood of humans with chronic moderate to severe plaque psoriasis with specific activities that may determine the effectiveness of treatment. These activities may be described by obtaining samples of skin and blood and analyzing them using a variety of tests.


Options:
A: Inclusion Criteria:

* Adults over 18 years of age with a diagnosis of chronic moderate to severe plaque psoriasis for at least 12 months; in generally good health; on stable dose of non-prohibited medications; able to stop current psoriasis therapy (systemic or topical) for several weeks prior to and during study participation.

Exclusion Criteria:

* Serious underlying disease including viral disorders such as hepatitis or HIV or skin condition that would interfere with skin biopsies or evaluation of psoriasis; conditions that could interfere with drug absorption after oral administration; history of malignancy or auto-immune disease.
* Use of oral or injected corticosteroids (steroids).
B: Key Eligibility Criteria

* Male or female
* Have had a diagnosis of plaque-type psoriasis at least 6 months prior to the first administration of study agent (subjects with concurrent psoriatic arthritis may be enrolled).
* Have plaque-type psoriasis covering at least 10% of their total BSA at screening and at the time of the first administration of study agent.
* Have a PGA score of ≥ 3 at screening and at the time of the first administration of study agent.
C: Inclusion criteria:

* Subject is male or female, aged ≥ 18 years to ≤ 70 years at Screening. Female subjects must either be postmenopausal (at least 1 year), permanently sterilized or, if of childbearing potential, must be willing to use at least 2 effective methods of contraception, including a barrier method during the study period. Effective methods of contraception are methods of birth control, which result in a low failure rate when used consistently and correctly, such as implants, injectables, oral contraceptives, progesterone-releasing intrauterine systems or the TCu 380A intrauterine device, complete sexual abstinence, or vasectomized partner. Male subjects with partners of childbearing potential must be willing to use a condom when sexually active. Both male and female subjects must use the above mentioned contraception for 20 weeks after administration of study drug (anticipated 5 half-lives)
* Subject has had a confirmed diagnosis of mild to moderate plaque-type psoriasis for at least 6 months involving ≤ 5 % of body surface area (BSA) (excluding the scalp)
* Subject has a body mass index of ≤ 35 kg/m\^2 at Screening
* Subject has a minimum of 2 psoriatic lesions with at least 1 plaque in a site suitable for biopsy

Exclusion Criteria:

* Female subject who is pregnant, or plans to become pregnant during the study, or lactating, or sexually active with childbearing potential who is not using a medically accepted birth control method
* Subject has received systemic nonbiologic psoriasis therapy (methotrexate \[MTX\], steroids, cyclophosphamide) or psoralen plus ultraviolet A (PUVA)/ultraviolet A (UVA) phototherapy within 4 weeks prior to Screening
* Subject has received treatment with biologic agents within 12 months prior to the study
* Subject has received live attenuated vaccination within 6 weeks prior to Screening or intends to have such a vaccination during the course of the study
* Subject has received any investigational drug or experimental procedure within 90 days or 5 half-lives, whichever is longer, prior to IMP administration
* Subject requires treatment with a nonsteroidal anti-inflammatory drug during the study period. Paracetamol will be permitted for use as an antipyretic and/or analgesic
* Subject has an active infection (eg, sepsis, pneumonia, abscess) or has had a serious infection (resulting in hospitalization or requiring parenteral antibiotic treatment) within 6 weeks prior to IMP administration. When in doubt, the Investigator should confer with the UCB Study Physician
* Subject has a history of a positive tuberculosis (TB) test or evidence of possible TB or latent TB infection at Screening that cannot be attributed to a prior Bacillus Calmette-Guérin inoculation
* Subject has renal or liver impairment, defined as:

  * For women, serum creatinine level ≥ 125 μmol/L; for men, ≥ 135 μmol/L, or
  * ALT and aspartate aminotransferase ≥ 2x ULN, or
  * Alkaline phosphatase and bilirubin \> 1.5x ULN (an isolated bilirubin \> 1.5x ULN is acceptable if bilirubin is fractionated and direct bilirubin is \< 35 %)
* Subject has active neoplastic disease or history of neoplastic disease within 5 years of Screening (except for basal or squamous cell carcinoma of the skin or carcinoma in situ that has been definitively treated with standard of care)
D: Inclusion Criteria:

* Males or females, ≥ 18 years of age
* Diagnosis of chronic, moderate to severe plaque psoriasis for at least 12 months prior to Screening, and a candidate for phototherapy and/or systemic (including etanercept) therapy
* Had an inadequate response, intolerance, or contraindication to at least 1 conventional systemic agent for the treatment of psoriasis.
* No prior exposure to biologics for treatment of psoriatic arthritis or psoriasis

Exclusion Criteria:

* Other than psoriasis, history of any clinically significant and uncontrolled systemic diseases; any condition, including the presence of laboratory abnormalities, which would place the subject at unacceptable risk if he/she were to participate in the study.
* Pregnant or breast feeding.
* Have failed more than 3 systemic agents for treatment of psoriasis.
* History of allergy to any component of the investigational product (IP), including human immunoglobulin (Ig) proteins or allergy to etanercept.
* Hepatitis B surface antigen or anti-hepatitis C antibody positive at Screening.
* Latent, active tuberculosis (TB) or inadequately treated TB; nontuberculous mycobacterial infection or opportunistic infection (eg, cytomegalovirus, Pneumocystis carinii, aspergillosis, Clostridium difficile).
* Have a history of, or ongoing, chronic or recurrent infectious disease
* Have received, or are expected to receive, any live virus or bacterial vaccination within 3 months before first administration of IP, or through Week 20 during the study.
* Had a Bacillus Calmette-Guérin (BCG) vaccination within 1 year prior to screening.
* History of positive human immunodeficiency virus (HIV), or have congenital or acquired immunodeficiency (eg, common variable immunodeficiency disease).
* Active substance abuse or a history of substance abuse within 6 months prior to Screening.
* Malignancy or history of malignancy, except for treated \[ie, cured\] basal cell or squamous cell in situ skin carcinomas and cervical intraepithelial neoplasia \[CIN\] or carcinoma in situ of the cervix with no evidence of recurrence within the previous 5 years.
* Psoriasis flare or rebound within 4 weeks prior to Screening.
* Topical therapy within 2 weeks of randomization or systemic therapy for psoriasis within 4 weeks prior to randomization
* Use of phototherapy within 4 weeks prior to randomization or prolonged sun exposure or use of tanning booths or other ultraviolet (UV) light sources.
* Any investigational drug within 4 weeks prior to randomization, or 5 pharmacokinetic/pharmacodynamic half lives, if known (whichever is longer).
* Prior treatment with apremilast or etanercept.

Answer: A