A Study To Evaluate The Pharmacokinetics, Excretion, Mass Balance and Metabolism of PF-07265803

The purpose of this study is to assess the pharmacokinetics, excretion, mass balance and metabolism of PF-07265803 (formerly known as ARRY-371797) in approximately 6 healthy adult male participants.


Eligibility Criteria:
Inclusion Criteria:

1. Participants must be male and ≥18 years of age at the time of signing the informed consent.
2. Male participants who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, and electrocardiogram (ECG) monitoring.
3. Participants who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests , lifestyle considerations , and other study procedures.
4. Body Mass Index of 18.0 to 32 kg/m2; and a total body weight \>50 kg (110 lb).
5. Capable of giving signed informed consent, which includes compliance with the requirements and restrictions listed in the ICD and in this protocol.

Exclusion Criteria:

1. Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing).
2. Any condition possibly affecting drug absorption (eg, gastrectomy, cholecystectomy, gastric bypass, duodenotomy, colectomy, history of inflammatory bowel disease).
3. History of HIV infection, hepatitis B, or hepatitis C; positive testing for HIV, HBsAg, or HCVAb. Hepatitis B vaccination is allowed.
4. Participants with a history of irregular bowel movements; e.g., less than 1 bowel movement per day, regular episodes of diarrhea or constipation, irritable bowel syndrome (IBS) or lactose intolerance.
5. Other medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality or other conditions or situations related to COVID-19 pandemic (eg. Contact with positive case)\] that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.
6. Use of prescription or nonprescription drugs and dietary and herbal supplements within 7 days or 5 half lives (whichever is longer) prior to the first dose of study intervention with the exception of moderate/potent CYP3A inducers which are prohibited within 14 days plus 5 half-lives prior to the first dose of study intervention.
7. Current use of any prohibited concomitant medication(s) or those unwilling/unable to use a permitted concomitant medication(s).
8. Previous administration with an investigational drug within 30 days (or as determined by the local requirement) or 5 half lives preceding the first dose of study intervention used in this study (whichever is longer).
9. A positive urine drug test.
10. Screening and baseline supine blood pressure (BP) \>140 mm Hg (systolic) or \>90 mm Hg (diastolic), following at least 5 minutes of supine rest. If BP is \>140 mm Hg (systolic) or \>90 mm Hg (diastolic), the BP should be repeated 2 more times and the average of the 3 BP values should be used to determine the participant's eligibility.
11. Screening and baseline standard 12 lead ECG that demonstrates clinically relevant abnormalities that may affect participant safety or interpretation of study results (eg, baseline QTcF interval \>450 msec, atrial fibrillation, complete left bundle branch block (LBBB), signs of an acute or indeterminate age myocardial infarction, ST T interval changes suggestive of myocardial ischemia, second or third degree AV block, or serious bradyarrhythmias or tachyarrhythmias). If the baseline uncorrected QT interval is \>450 msec, this interval should be rate corrected using the Fridericia method and the resulting QTcF should be used for decision making and reporting. If QTcF exceeds 450 msec, or QRS exceeds 120 msec, the ECG should be repeated 2 more times and the average of the 3 QTcF or QRS values should be used to determine the participant's eligibility. Computer interpreted ECGs should be overread by a physician experienced in reading ECGs before excluding a participant.
12. Participants with ANY of the following abnormalities in clinical laboratory tests at screening, as assessed by the study specific laboratory and confirmed by a single repeat test, if deemed necessary:

    * Aspartate aminotransferase (AST) or Alanine Aminotransferase (ALT) level ≥ 1.5 × ULN;
    * Total bilirubin level ≥1.5 × ULN; participants with a history of Gilbert's syndrome may have direct bilirubin measured and would be eligible for this study provided the direct bilirubin level is≤ ULN.
13. History of alcohol abuse or binge drinking and/or any other illicit drug use or dependence within 6 months of Screening. Binge drinking is defined as a pattern of 5 (male) or more alcoholic drinks in about 2 hours. As a general rule, alcohol intake should not exceed 14 units per week (1 unit = 8 ounces (240 mL) beer, 1 ounce (30 mL) of 40% spirit or 3 ounces (90 mL) of wine).
14. Positive urine drug screen or cotinine at screening or check-in, and positive urine alcohol at check-in.
15. Blood donation (excluding plasma donations) of approximately 1 pint (500 mL) or more within 60 days prior to dosing.
16. History of sensitivity to heparin or heparin induced thrombocytopenia.
17. Unwilling or unable to comply with the criteria in the Lifestyle Considerations of this protocol.
18. Investigator site staff or Pfizer employees directly involved in the conduct of the study, site staff otherwise supervised by the investigator, and their respective family members.
19. Subjects with exposure to significant diagnostic or therapeutic radiation (eg,serial x ray, computed tomography scan, barium meal) or current employment in a job requiring radiation exposure monitoring within 12 months prior to check-in.
20. Subjects who have participated in more than 3 radiolabeled drug studies in the last 12 months (previous study to be at least 4 months prior to check-in to the study site where exposures are known to the investigator, or 6 months prior to check-in to the study site for a radiolabeled drug study where exposures are not known to the investigator). The total 12-month exposure from this study and a maximum of 2 other previous radiolabeled studies within 4 to 12 months prior to this study will be within the Code of Federal Regulations (CFR) recommended levels considered safe, per United States (US) Title 21 CFR 361.1.