A Study to Understand What the Body Does to the Study Medicine Called PF-07799544 When Taken by Healthy Adults

A PHASE 1, OPEN-LABEL, FIXED SEQUENCE, 2-PERIOD STUDY IN HEALTHY ADULT PARTICIPANTS TO ASSESS THE MASS BALANCE, ABSOLUTE BIOAVAILABILITY, FRACTION ABSORBED, AND PHARMACOKINETICS OF [14C]PF-07799544 USING A 14C-MICROTRACER APPROACH

For this study, the study medicine has been specially prepared to contain radiolabeled carbon [14C]. [14C] is a naturally occurring radioactive form of the element carbon. Adding a low dose of radiation to the study medicine does not change how the medicine works but helps to see how the medicine appears in the blood, urine, and stool after it is given. This type of study is called a radiolabeled study.

The purpose of this radiolabeled study is to learn how a certain amount of [14C] PF-07799544 is taken up into the bloodstream and removed from the body.

The study is seeking participants who are:

Male Ages 18 to 55 years of age confirmed to be healthy based on medical and physical tests.

Weigh more than 50 kilograms (kg) and have a body mass index of 17.5 to 32 kg per meter squared.

The study consists of two parts. In part one, all participants will receive one full dose of [14C]PF-07799544 by mouth.

Part two will begin at least 14 days after the dose in part one. In part two, participants will receive one full dose of PF-07799544 by mouth and one small dose of [14C] PF-07799544 by intravenous (IV) infusion. IV infusion will be directly injected into the veins.

To understand how the medicine is processed in the body, samples of blood, urine, feces, and vomit (if any) will be collected after each dose is given. This will help understand:

How much PF-07799544 is taken up into the bloodstream when taken by mouth compared to the dose given by IV How the body removes it from the blood steam. Participants will take part in the study for about 7 weeks, including evaluation at the start and follow-up period.

Study Overview

• Status: Not yet recruiting
• Conditions: Healthy Male Volunteers
• Intervention / Treatment: Drug: Oral [14C] PF-07799544; Drug: Oral Unlabeled PF-07799544; Drug: IV [14C] PF-07799544

Detailed Description

Not Provided.

• Study Type: Interventional
• Enrollment (Estimated): 9
• Phase: Phase 1

Contacts and Locations

• Study Contact: Name: Pfizer CT.gov Call Center; Phone Number: 1-800-718-1021; Email: ClinicalTrials.gov_Inquiries@pfizer.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

Males 18 to 55years of age, inclusive, at screening who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, vital signs, and 12-lead ECGs.

BMI of 17.5-32 kg/m2; and a total body weight >50 kg (110 lb).

Exclusion Criteria:

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.

Previous administration of an investigational product (drug or vaccine) within 30 days or 5 half-lives preceding the first dose of study intervention used in this study (whichever is longer). Participation in studies of other investigational products (drug or vaccine) at any time during participation in this study.

Total 14C radioactivity measured in plasma should not exceed 2.5 × standard biological carbon ratio.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Non-Randomized
• Interventional Model: Crossover Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Cohort 1; Participants will receive one dose of [14C] PF-07799544 by mouth in Period 1. After a washout, participants will receive one dose of PF-07799544 by mouth and one intravenous (IV) infusion of [14C] PF-07799544 in Period 2

Drug: Oral [14C] PF-07799544; A single oral dose of [14C] PF-07799544 will be administered as an extemporaneous suspension in Period 1.; Drug: Oral Unlabeled PF-07799544; A single oral dose of unlabeled PF-07799544 will be administered as extemporaneous solution in Period 2.; Drug: IV [14C] PF-07799544; A single IV infusion of [14C] PF-07799544 will be administered at the approximate Tmax after administration of the unlabeled oral dose of PF-07248144 in Period 2.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Total recovery (%) of radioactivity in urine, feces and vomitus (if any), expressed as a percent of total oral radioactive dose administered.	To characterize the extent of excretion of total radioactivity in urine, feces and vomitus (if any) following administration of a single oral dose of [14C]PF-07799544.	Period 1 pre-dose to maximum days 15
Metabolic profiling/identification and determination of relative abundance of [14C]PF-07799544 and the metabolites of PF-07799544 in plasma, urine and feces, if possible.	To characterize the metabolic profile and identify the circulating and excreted metabolites of PF- 07799544 following administration of a single oral dose of [14C]PF-07799544.	Period 1 pre-dose to maximum days 15

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The ratio of dose-normalized AUCinf (if data permit, otherwise AUClast) of oral PF-07799544 to IV [14C]PF-07799544.	To determine the oral absolute bioavailability (F) of PF-07799544 from a single oral dose of PF-07799544 compared to a single IV microtracer of [14C]PF-07799544.	Period 2 pre-dose to maximum days 6.
The ratio of total recovered radioactivity 14C in urine following single dose administration of [14C]PF-07799544 orally in Period 1 and IV microtracer, microdose administration of [14C]PF-07799544 in Period 2.	To determine the fraction of PF-07799544 dose absorbed (Fa) from a single oral dose of [14C]PF-07799544.	Period 1 pre-dose to maximum days 15; Period 2 pre-dose to maximum days 6.
Number of Participants With Treatment Emergent Adverse Events.	To evaluate the safety and tolerability of PF-07799544, administered as a single oral dose of [14C]PF-07799544 or a single oral dose of PF-07799544 followed by administration of a single IV microdose of [14C]PF-07799544.	Baseline up to 28 to 35 days post last study intervention dose.
Number of Participants with Treatment Emergent Clinically Significant Laboratory Abnormalities.	To evaluate the safety and tolerability of PF-07799544, administered as a single oral dose of [14C]PF-07799544 or a single oral dose of PF-07799544 followed by administration of a single IV microdose of [14C]PF-07799544.	Baseline up to 28 to 35 days post last study intervention dose.
Number of Participants With Treatment Emergent Clinically Significant Abnormal Vital Signs.	To evaluate the safety and tolerability of PF-07799544, administered as a single oral dose of [14C]PF-07799544 or a single oral dose of PF-07799544 followed by administration of a single IV microdose of [14C]PF-07799544.	Baseline up to 28 to 35 days post last study intervention dose.
Number of Participants With Treatment Emergent Clinically Significant Physical Examination Abnormalities.	To evaluate the safety and tolerability of PF-07799544, administered as a single oral dose of [14C]PF-07799544 or a single oral dose of PF-07799544 followed by administration of a single IV microdose of [14C]PF-07799544.	Baseline up to 28 to 35 days post last study intervention dose.
Number of Participants With Treatment Emergent Clinically Significant Abnormal ECG Measurements.	To evaluate the safety and tolerability of PF-07799544, administered as a single oral dose of [14C]PF-07799544 or a single oral dose of PF-07799544 followed by administration of a single IV microdose of [14C]PF-07799544.	Baseline up to 28 to 35 days post last study intervention dose.

Collaborators and Investigators

• Sponsor: Pfizer
• Investigators: Study Director: Pfizer CT.gov Call Center, Pfizer

Publications and helpful links

Helpful Links

• To obtain contact information for a study center near you, click here.

Study record dates

Study Major Dates

• Study Start (Estimated): May 15, 2026
• Primary Completion (Estimated): September 12, 2026
• Study Completion (Estimated): September 12, 2026

Study Registration Dates

• First Submitted: May 5, 2026
• First Submitted That Met QC Criteria: May 5, 2026
• First Posted (Actual): May 11, 2026

Study Record Updates

• Last Update Posted (Actual): May 11, 2026
• Last Update Submitted That Met QC Criteria: May 5, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Other Study ID Numbers: C4901004

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No