A Hepatic Impairment Study for PF-04965842.

Study Overview
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Brief Summary
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This is a Phase 1 non randomized, open label, single dose, parallel cohort study to investigate the effect of hepatic impairment on the PK, safety and tolerability of PF 04965842.

Detailed Description
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A minimum of 24 subjects with normal, mild or moderate hepatic function will be enrolled into the study, with approximately 8 subjects in each cohort. The Child Pugh classification score will be utilized to assess entry criteria and to assign subjects into the appropriate hepatic impairment group. For individual subjects, the total maximum duration of study participation from the Screening visit to the end of clinical research unit (CRU) stay is approximately 31 days and approximately 63 days from the Screening visit to the Follow up contact.

Official Title
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A PHASE 1, NON-RANDOMIZED, OPEN-LABEL, SINGLE-DOSE STUDY TO COMPARE THE PHARMACOKINETICS, SAFETY AND TOLERABILITY OF PF-04965842 IN ADULT SUBJECTS WITH MILD AND MODERATE HEPATIC IMPAIRMENT RELATIVE TO SUBJECTS WITH NORMAL HEPATIC FUNCTION

Conditions
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Hepatic Impairment

Intervention / Treatment
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* Drug: PF-04965842


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Body mass index (BMI) of 17.5 to 40 kg/m2; and a total body weight >50 kg (110 pounds). Subjects who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests, and other study procedures. Additional Inclusion Criteria for subjects with hepatic impairment: Satisfy the criteria for Class A or Class B of the Child Pugh classification (mild: Child Pugh Scores 5 to 6 points, and moderate: Child Pugh Scores 7 to 9 points), within 14 days of investigational product administration. A diagnosis of hepatic dysfunction due to hepatocellular disease (and not secondary to any acute ongoing hepatocellular process) documented by medical history, physical examination, liver biopsy, hepatic ultrasound, computerized tomography scan, or magnetic resonance imaging (MRI). Exclusion Criteria: Subjects with clinically significant infections within the past 3 months (for example, those requiring hospitalization, or as judged by the Investigator), evidence of any infection (including influenza) within the past 7 days, history of disseminated herpes simplex infection or recurrent (>1 episode) or disseminated herpes zoster. Subjects with a malignancy or with a history of malignancy, with the exception of adequately treated or excised non metastatic basal cell or squamous cell cancer of the skin or cervical carcinoma in situ. Additional exclusion criteria for subjects with hepatic impairment: Hepatic carcinoma or hepatorenal syndrome or limited predicted life expectancy (defined as less than 1 year). Subjects who have previously had a transplanted kidney, liver, or heart. At Screening, persistent severe, uncontrolled hypertension.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Parallel Assignment
Interventional Model Description: Recruitment for subjects with moderate and mild hepatic impairment (Cohorts 1 and 2) will initiate first and these subjects will be enrolled in parallel.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: PF-04965842<br>PF 04965842 is an orally bioavailable small molecule that selectively inhibits JAK1. | Drug: PF-04965842<br>* PF 04965842 is an orally bioavailable small molecule that selectively inhibits JAK1.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum Observed Plasma Concentration (Cmax) for PF-04965842 | Cmax is maximum plasma concentration. It was observed directly from data. | 0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 10, 14, 24, 36, 48, 72 hours post-dose in each cohort | 
| Area Under the Plasma Concentration-Time Curve From Time Zero Extrapolated to Infinite Time (AUCinf) for PF-04965842 | AUCinf is area under the concentration-time curve (AUC) from time 0 (pre-dose) extrapolated to infinite time. | 0 (pre-dose), 0.5, 1, 2, 3, 4, 6, 8, 10, 14, 24, 36, 48, 72 hours post-dose in each cohort | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Participants With Treatment-Emergent Adverse Events (AEs) for PF-04965842 | Treatment-related AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. Treatment-emergent adverse events (TEAEs) were those with initial onset or increasing in severity between the first dose of investigational product and up to 36 days post-dose. | From screening (within 28 days prior to Day 1) till up to 36 days post-dose, the total maximum duration was approximately 63 days for individual participants. | 
| Number of Participants With Laboratory Test Abnormalities (Without Regard to Baseline Abnormality) | Laboratory tests included tests that were performed under the categories of hematology, chemistry, urinalysis, other, and additional tests needed for Hy's law. | Screening (within 28 days prior to Day 1), Day -1, 2, 24, 72 hours post-dose. | 
| Number of Participants With Electrocardiogram (ECG) Findings of Potential Clinical Importance for PF-04965842 | 12-Lead ECGs were collected after the participants rested quietly for at least 10 minutes in a supine position. Clinical significance of ECG recordings was determined at the investigator's discretion. | Screening (within 28 days prior to Day 1), Day -1, 2, 72 hours post-dose. | 
| Number of Participants With Vital Sign Findings of Potential Clinical Importance for PF-04965842 | Vital signs (pulse rate, systolic and diastolic blood pressure) were obtained with participant following at least 5 minutes of supine rest. Clinical significance of vital signs was determined at the investigator's discretion. | Screening (within 28 days prior to Day 1), 0 (pre-dose), and 72 hours post-dose. |