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PF-07261271

Phase 1

Healthy | Small molecule | Other |Pfizer, Inc.|Last Updated: Mar 24, 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment35

FDA Designations

No designations recorded

Clinical trial landscape

PF-07261271 · 1 trial · 1 indication

Phase 1 1
NCT05536440A Study to Learn About Study Medicine Called PF-07261271 in Healthy PeopleHealthy
COMPLETED35 Analytics
PHASE1COMPLETED
A Study to Learn About Study Medicine Called PF-07261271 in Healthy People
HealthyUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment Emergent Adverse Events (TEAEs): SAD Cohort
From start of study intervention (Day 1) up to end of study, approximately up to 15 months

An adverse event (AE) was any untoward medical occurrence in a participant or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE was considered a TEAE if the event started during the effective duration of treatment. All events that started on or after the first dosing day and time/start time, if collected, but before the end of the last follow-up date, were considered as TEAEs. AEs included all SAEs and Non-SAEs.

Number of Participants With Treatment Emergent Adverse Events (TEAEs): MD Cohort
From start of study intervention (Day 1) up to end of study, approximately of 15.5 months

An AE was any untoward medical occurrence in a participant or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE was considered a TEAE if the event started during the effective duration of treatment. All events that started on or after the first dosing day and time/start time, if collected, but before the end of the last follow-up date, were considered as TEAEs. AEs included all SAEs and Non-SAEs.

Number of Participants With Serious Adverse Events (SAEs): SAD Cohort
From start of study intervention (Day 1) up to end of study, approximately up to 15 months

An AE was any untoward medical occurrence in a participant or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. SAEs were defined as any untoward medical occurrence that, at any dose, met one or more of the criteria: resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect, was a suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or other medically significant event.

Number of Participants With Serious Adverse Events (SAEs): MD Cohort
From start of study intervention (Day 1) up to end of study, approximately of 15.5 months

An AE was any untoward medical occurrence in a participant or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. SAEs were defined as any untoward medical occurrence that, at any dose, met one or more of the criteria: resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect, was a suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or other medically significant event.

Number of Participants With Clinically Significant Changes in Vital Signs Abnormalities: SAD Cohort
From start of study intervention (Day 1) up to end of study, approximately up to 15 months

Criteria for abnormal values of vital signs: systolic blood pressure (millimeters of mercury \[mmHg\]) value less than (\<) 90 mmHg, change greater than or equal to (\>=) 30 mmHg increase, change \>= 30 mmHg decrease; diastolic blood pressure (mmHg), value \<50 mmHg, change \>=20 mmHg increase, change \>=20 mmHg decrease; pulse rate (beats per minute \[bpm\]) value \<40bpm, value greater than (\>) 120bpm. Clinical significance was determined based on investigator's discretion.

Number of Participants With Clinically Significant Changes in Vital Signs Abnormalities: MD Cohort
From start of study intervention (Day 1) up to end of study, approximately of 15.5 months

Criteria for abnormal values of vital signs: systolic blood pressure (mmHg) value \< 90 mmHg, change \>= 30 mmHg increase, change \>= 30 mmHg decrease; diastolic blood pressure (mmHg), value \<50 mmHg, change \>=20 mmHg increase, change \>=20 mmHg decrease; pulse rate (bpm) value \< 40bpm, value \> 120bpm. Clinical significance was determined based on investigator's discretion.

Number of Participants With Clinically Significant Changes in Laboratory Abnormalities: SAD Cohort
From start of study intervention (Day 1) up to end of study, approximately up to 15 months

Criteria:Hematology(Activated partial thromboplastin time\>1.1\*upper limit of normal(ULN); Basophils \&eosinophils\>1.2\*ULN; erythrocytes,hematocrit,hemoglobin,lymphocytes,neutrophils \<0.8\*lower limit of normal(LLN); leukocytes \<0.6\*LLN, \>1.5\*ULN; monocytes \>1.2\*ULN; platelets \<0.5\*LLN; prothrombin international randomized ratio \&prothrombin Time \>1.1\*ULN), clinical chemistry (alanine aminotransferase, alkaline phosphatase, aspartate aminotransferase \>3.0\*ULN; albumin, protein \<0.8\*LLN, \>1.2\*ULN; bicarbonate, calcium, chloride, potassium \<0.9\*LLN,\>1.1\*ULN; bilirubin \>1.5\*ULN; creatinine \>1.3\*ULN; glucose, Glucose-FASTING \<0.6\*LLN,\>1.5\*ULN; Sodium \<0.95\*LLN,\>1.05\*ULN; Urate: \>1.2\*ULN;Urea Nitrogen: \>1.3\*ULN),urinalysis(Bacteria \> 20;epithelial cells \>=6;granular, hyaline, RBC\&WBC casts \>1;ketones,leukocyte esterase, nitrite, urine glucose, urine hemoglobin, urine protein\>=1,urine erythrocytes,leukocytes \>=20;pH(scalar)\<4.5,\>8.Clinical significance determined on investigator's discretion.

Number of Participants With Clinically Significant Changes in Laboratory Abnormalities: MD Cohort
From start of study intervention (Day 1) up to end of study, approximately of 15.5 months

Criteria:Hematology(Activated partial thromboplastin time\>1.1\*upper limit of normal(ULN); Basophils \&eosinophils\>1.2\*ULN; erythrocytes,hematocrit,hemoglobin,lymphocytes,neutrophils \<0.8\*lower limit of normal(LLN); leukocytes \<0.6\*LLN, \>1.5\*ULN; monocytes \>1.2\*ULN; platelets \<0.5\*LLN; prothrombin international randomized ratio \&prothrombin Time \>1.1\*ULN), clinical chemistry (alanine aminotransferase, alkaline phosphatase, aspartate aminotransferase \>3.0\*ULN; albumin, protein \<0.8\*LLN, \>1.2\*ULN; bicarbonate, calcium, chloride, potassium \<0.9\*LLN,\>1.1\*ULN; bilirubin \>1.5\*ULN; creatinine \>1.3\*ULN; glucose, Glucose-FASTING \<0.6\*LLN,\>1.5\*ULN; Sodium \<0.95\*LLN,\>1.05\*ULN; Urate: \>1.2\*ULN;Urea Nitrogen: \>1.3\*ULN),urinalysis(Bacteria \> 20;epithelial cells \>=6;granular, hyaline, RBC\&WBC casts \>1;ketones,leukocyte esterase, nitrite, urine glucose, urine hemoglobin, urine protein\>=1,urine erythrocytes,leukocytes \>=20;pH(scalar)\<4.5,\>8.Clinical significance determined on investigator's discretion.

Number of Participants With Clinically Significant Changes in Electrocardiogram (ECG) Abnormalities: SAD Cohort
From start of study intervention (Day 1) up to end of study, approximately up to 15 months

Criteria for abnormal values of ECG parameters: pulse rate (PR) interval greater than or equal to (\>=)300 milliseconds (msec); PR interval change \>=25 percent (%) or \>=50 %, QRS interval \>=140 msec and QRS interval change: \>=50%. QT interval using Fridericia's correction (QTcF) range from 450 msec to less than (\<)480 msec, less than (\<) 480 msec to maximum less than or equal to (\<=)500 msec, \>500 msec, \<=30 to \<60 msec and \>=60 msec. Only rows which included at least 1 participant with abnormality are reported in this outcome measure. Clinical significance was determined based on investigator's discretion.

Number of Participants With Clinically Significant Changes in ECG Abnormalities: MD Cohort
From start of study intervention (Day 1) up to end of study, approximately of 15.5 months

Criteria for abnormal values of ECG parameters: pulse rate (PR) interval greater than or equal to (\>=)300 milliseconds (msec); PR interval change \>=25 percent (%) or \>=50 %, QRS interval \>=140 msec and QRS interval change: \>=50%. QT interval using Fridericia's correction (QTcF) range from 450 msec to less than (\<)480 msec, less than (\<) 480 msec to maximum less than or equal to (\<=)500 msec, \>500 msec, \<=30 to \<60 msec and \>=60 msec. Only rows which included at least 1 participant with abnormality are reported in this outcome measure. Clinical significance was determined based on investigator's discretion.

Secondary Endpoints

Area Under the Concentration Versus Time Curve From Time Zero to the Last Quantifiable Time Point (AUClast) of PF-07261271: SAD Cohort
Predose and 0, 2, 4, 8, 12, 24, 48, 72, 192, 360, 768, 1104, 1464, 2184, 4344, 5064, 5784, 6504, 7224, 7944, 8664, 10824 hours post dose
Area Under the Serum Concentration Time Profile From Time Zero Extrapolated to Infinite Time (AUCinf) of PF-07261271: SAD Cohort
Predose and 0, 2, 4, 8, 12, 24, 48, 72, 192, 360, 768, 1104, 1464, 2184, 4344, 5064, 5784, 6504, 7224, 7944, 8664, 10824 hours post dose
Maximum Plasma Concentration (Cmax) of PF-07261271: SAD Cohort
Predose and 0, 2, 4, 8, 12, 24, 48, 72, 192, 360, 768, 1104, 1464, 2184, 4344, 5064, 5784, 6504, 7224, 7944, 8664, 10824 hours post dose
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1 activeEXPERIMENTALDose A
Cohort 1 placeboPLACEBO_COMPARATORDose A
Cohort 2 activeEXPERIMENTALDose B
Cohort 2 placeboPLACEBO_COMPARATORDose B
Cohort 3 activeEXPERIMENTALDose C
Cohort 3 placeboPLACEBO_COMPARATORDose C
Cohort 4 activeEXPERIMENTALDose D
Cohort 4 placeboPLACEBO_COMPARATORDose D
Cohort 5 activeEXPERIMENTALDose E
Cohort 5 placeboPLACEBO_COMPARATORDose E
Cohort 6 activeEXPERIMENTALDose F
Cohort 6 placeboPLACEBO_COMPARATORDose F
Cohort 7 activeEXPERIMENTALDose G
Cohort 7 placeboPLACEBO_COMPARATORDose G
Cohort 8 activeEXPERIMENTALDose H
Cohort 8 placeboPLACEBO_COMPARATORDose H

Interventions

NameTypeDescription
PF-07261271DRUGIV or SC
PlaceboDRUGIV or SC
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites4

Inclusion Criteria: * Healthy individuals as determined by medical evaluation * Body mass index (BMI) of 17.5 to 30.5 kg/m2; and a total body weight \>50 kg (110 lb). Exclusion Criteria: * Clinically significant medical conditions * History of HIV infection, hepatitis B, or hepatitis C * BP ≥140 ...

Countries:United States
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Frequently asked questions about PF-07261271

What is PF-07261271 used for?

PF-07261271 is an investigational small molecule being studied for use in healthy people. It is currently in Phase 1 clinical development, with a completed trial that enrolled healthy volunteers to evaluate the study medicine. The drug is not approved and remains under investigation.

Who makes PF-07261271?

PF-07261271 is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. The company is conducting clinical research to evaluate this investigational small molecule in healthy participants.

What phase is PF-07261271 in?

PF-07261271 is in Phase 1 clinical development. A Phase 1 study has been completed, and the drug remains investigational. It has not been approved by regulatory authorities, and its safety and efficacy are still being evaluated in clinical trials.

What clinical trials is PF-07261271 in?

PF-07261271 has one completed Phase 1 clinical trial, identified as NCT05536440. The study, titled "A Study to Learn About Study Medicine Called PF-07261271 in Healthy People," enrolled 35 participants in the United States. It was a randomized, double-blind, placebo-controlled trial involving healthy volunteers aged 18 years and older.

Is PF-07261271 the same as any other drug?

PF-07261271 is the primary name for this investigational drug, and no alternative names have been reported. It is a distinct small molecule being developed by Pfizer, Inc. for evaluation in healthy individuals as part of early-stage clinical research.