A Study to Evaluate the Pharmacokinetics, Safety and Tolerability of PF-06651600 in Subjects With Hepatic Impairment and Healthy Volunteers

A PHASE 1, NON-RANDOMIZED, OPEN LABEL, MULTIPLE DOSE STUDY TO EVALUATE THE PHARMACOKINETICS, SAFETY AND TOLERABILITY OF PF 06651600 IN SUBJECTS WITH HEPATIC IMPAIRMENT AND IN HEALTHY SUBJECTS WITH NORMAL HEPATIC FUNCTION

The purpose of this study is to characterize the effect of hepatic impairment on the pharmacokinetic(s) (PK) of PF-06651600 following administration of multiple once daily doses of PF-06651600. The safety and tolerability of PF-06651600 will also be evaluated in this study.

Inclusion Criteria:

• Willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations and other study procedures
• Body mass index (BMI) of 17.5 to 40 kg/m2; and a total body weight >50 kg (110 lb)

Additional Inclusion Criteria for Participants with Normal Hepatic Function:

• Healthy male or female participants
• No known or suspected hepatic disease

Additional Inclusion Criteria for Participants with Impaired Hepatic Function:

• Stable hepatic impairment, defined as no clinically significant change in disease status within the last 30 days prior to the Screening visit
• No other ongoing clinically significant abnormalities based on medical history, physical examination, vital signs, 12-lead ECG, and clinical laboratory tests except for the abnormal findings that are related to the participant's hepatic impairment.
• Satisfy the criteria for Class A or Class B of the Child-Pugh classification (mild: Child-Pugh Scores 5-6 points, and moderate: Child Pugh Scores 7-9 points), within 28 days of investigational product administration.

Exclusion Criteria:

• Has active acute or chronic infection requiring treatment or history of systemic infection requiring hospitalization, incl. herpes zoster, herpes simplex, tuberculosis
• Infection with hepatitis B, hepatitis C or HIV
• Any condition affecting drug absorption, distribution, metabolism and excretion (eg, status post porta-caval shunt surgery, prior bariatric surgery, gastrectomy, ileal resection)
• Has malignancy, lymphoproliferative disorder, surgery or other condition not allowed per protocol

Additional Exclusion Criteria for Participants with Normal Hepatic Function:

- Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, gynecologic or allergic disease

Additional Exclusion Criteria for Participants with Impaired Hepatic Function:

- Has encephalopathy, severe ascites and/or pleural effusion, Child-Pugh score >9 or medical conditions (like hepatorenal syndrome, gastrointestinal hemorrhage, etc.) excluded per protocol