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Atirmociclib

Phase 1

Hepatic Impairment | Small molecule | Gastrointestinal |Pfizer, Inc.|Last Updated: Aug 21, 2026

Target and mechanism

Target class-Ciclib (Cdk)
ModalitySmall molecule

Also known as PF-07220060, PF-07220060 CDK4 inhibitor

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment28

FDA Designations

No designations recorded

Clinical trial landscape

Atirmociclib · 2 trials · 4 indications

Phase 1 2
NCT07677358A Study to Learn How the Study Medicine Called Atirmociclib is Handled by the Body in People With Normal Liver Function and Different Levels of Liver DiseaseHepatic Impairment
RECRUITING28 Analytics
NCT07215078Study About Whether Atirmociclib/PF-07220060 Proportionally Increases Exposure as Dose Increases in Healthy ParticipantsHealthy Volunteer
COMPLETED72 Analytics
PHASE1RECRUITING
A Study to Learn How the Study Medicine Called Atirmociclib is Handled by the Body in People With Normal Liver Function and Different Levels of Liver Disease
Hepatic ImpairmentUnlock trial analytics
PHASE1COMPLETED
Study About Whether Atirmociclib/PF-07220060 Proportionally Increases Exposure as Dose Increases in Healthy Participants
Healthy VolunteerUnlock trial analytics

Study Endpoints

Primary Endpoints

Maximum Observed Plasma Concentration (Cmax) for atirmociclib in participants with normal hepatic function
Pre-dose and at, 1, 2, 4, 6, 8, 12, and 24, 36, 48, 60, 72, 96, 120, 144 hours after a single oral dose

Maximum observed plasma concentration (Cmax) for atirmociclib following a single oral dose in participants with normal hepatic function

Maximum Observed Plasma Concentration (Cmax) for atirmociclib in participants with hepatic impairment
Pre-dose and at, 1, 2, 4, 6, 8, 12, and 24, 36, 48, 60, 72, 96, 120, 144, 168, 192 hours after a single oral dose

Maximum observed plasma concentration (Cmax) for atirmociclib following a single oral dose in participants with hepatic impairment

Area under the curve from time zero to extrapolated infinite time [AUC (0 - ∞)] for atirmociclib in participants with normal hepatic function
Pre-dose and at, 1, 2, 4, 6, 8, 12, and 24, 36, 48, 60, 72, 96, 120, 144 hours after a single oral dose

AUC (0 - ∞)= Area under the plasma concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0 - ∞). It is obtained from AUC (0 - t) plus AUC (t - ∞).

Area under the curve from time zero to extrapolated infinite time [AUC (0 - ∞)] for atirmociclib in participants with impaired hepatic function
Pre-dose and at, 1, 2, 4, 6, 8, 12, and 24, 36, 48, 60, 72, 96, 120, 144, 168, 192 hours after a single oral dose

AUC (0 - ∞)= Area under the plasma concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0 - ∞). It is obtained from AUC (0 - t) plus AUC (t - ∞).

Area Under the Curve From Time Zero to Extrapolated Infinite Time (AUCinf)
1 hour prior to atirmociclib dosing, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 36, 48, 72, 96 and 120 hours post-dose

Dose-normalized plasma AUCinf and Cmax of atirmociclib for each cohort (AUClast if AUCinf cannot be estimated)

Maximum Observed Plasma Concentration (Cmax)
1 hour prior to atirmociclib dosing, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 36, 48, 72, 96 and 120 hours post-dose

Secondary Endpoints

Number of Participants With Treatment-Emergent Adverse Events
Time from baseline through and including follow-up contact occurring 28 to 35 calendar days after the last administration of atirmociclib
Number of Participants With Normal Hepatic Function having Clinically Significant Clinical Laboratory Abnormalities
Baseline and Day 2, Day 7 after a single oral dose of atirmociclib
Number of Participants With Impaired Hepatic Function having Clinically Significant Clinical Laboratory Abnormalities
Baseline and Day 2, Day 9 after a single oral dose of atirmociclib
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Study Design & Arms

AllocationNA
MaskingNONE
ModelPARALLEL
PurposeOTHER

Treatment Arms

ArmTypeDescription
Group 1: Normal Hepatic FunctionEXPERIMENTALAtirmociclib administered as a single oral dose
Group 4: Severe Hepatic ImpairmentEXPERIMENTALAtirmociclib administered as a single oral dose
Group 3: Moderate Hepatic ImpairmentEXPERIMENTALAtirmociclib administered as a single oral dose
Group 2: Mild Hepatic ImpairmentEXPERIMENTALAtirmociclib administered as a single oral dose
Cohort 1EXPERIMENTALIn Period 1 Day 1, participants from Sequence AB and BA will receive Dose A and Dose B atirmociclib higher drug load IR MST tablet, respectively. In Period 2 Day 1, the participants from two sequences in the same cohort will shuffle the treatment.
Cohort 6EXPERIMENTALIn Period 1 Day 1, participants from Sequence CD and DC will receive Dose C and Dose D atirmociclib higher drug load IR MST tablets, respectively. In Period 2 Day 1, the participants from two sequences in the same cohort will shuffle the treatment.
Cohort 2EXPERIMENTALIn Period 1 Day 1, participants from Sequence AC and CA will receive Dose A and Dose C atirmociclib higher drug load IR MST tablet, respectively. In Period 2 Day 1, the participants from two sequences in the same cohort will shuffle the treatment.
Cohort 4EXPERIMENTALIn Period 1 Day 1, participants from Sequence AD and DA will receive Dose A and Dose D atirmociclib higher drug load IR MST tablet, respectively. In Period 2 Day 1, the participants from two sequences in the same cohort will shuffle the treatment.
Cohort 3EXPERIMENTALIn Period 1 Day 1, participants from Sequence BC and CB will receive Dose B and Dose C atirmociclib higher drug load IR MST tablets, respectively. In Period 2 Day 1, the participants from two sequences in the same cohort will shuffle the treatment.
Cohort 5EXPERIMENTALIn Period 1 Day 1, participants from Sequence BD and DB will receive Dose B and Dose D atirmociclib higher drug load IR MST tablets, respectively. In Period 2 Day 1, the participants from two sequences in the same cohort will shuffle the treatment.

Interventions

NameTypeDescription
AtirmociclibDRUGatirmociclib administered as a single oral dose
atirmociclib (PF-07220060)DRUGOpen-label, two-period, cross-over study to evaluate dose proportionality of atirmociclib (PF-07220060) pharmacokinetics when administered under fed condition to healthy participants
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites3

Inclusion criteria including but not limited to: * BMI of 17.5-40 kg/m2; and a total body weight \>50 kg (110 lb). * Willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations, and other study procedures. * Capable of giving signed informed cons...

Countries:United States
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Recent Changes (Last 90 Days)

HIGHAug 21, 2026NCT07215078Status: RECRUITING → COMPLETED
LOWAug 21, 2026NCT07677358Status: NOT_YET_RECRUITING → RECRUITING
HIGHAug 21, 2026NCT07215078Status: RECRUITING → COMPLETED
LOWAug 21, 2026NCT07677358Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 30, 2026NCT07677358NEW_TRIAL: changed
LOWJun 30, 2026NCT07677358NEW_TRIAL: changed
LOWJun 30, 2026NCT07677358NEW_TRIAL: changed

Frequently asked questions about Atirmociclib

What is Atirmociclib used for?

Atirmociclib is an investigational small molecule being studied for use in advanced or metastatic breast cancer, liposarcoma, prostate cancer, and adenocarcinoma of the lung. It is also being evaluated in healthy participants for drug interaction studies. Atirmociclib is not yet approved and remains in clinical development.

What does Atirmociclib target?

Atirmociclib is a CDK inhibitor, belonging to the -ciclib class of drugs that target cyclin-dependent kinases. It is being studied for its potential role in treating certain cancers by interfering with cell cycle progression.

Who makes Atirmociclib?

Atirmociclib is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. Pfizer is conducting clinical trials to evaluate the safety and efficacy of this investigational drug.

What phase is Atirmociclib in?

Atirmociclib is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by regulatory authorities. Clinical trials are ongoing to assess its safety, tolerability, and potential efficacy in various cancer types.

What clinical trials is Atirmociclib in?

Atirmociclib is being studied in several clinical trials, including NCT04557449 in advanced solid tumors, NCT06465368 in postmenopausal breast cancer, NCT06760637 in HR-positive HER2-negative breast cancer, and NCT06897683 in healthy adults. These trials are at various stages and are conducted internationally.

Is Atirmociclib the same as PF-07220060?

Yes, Atirmociclib is also known as PF-07220060. The drug is referred to by this alternative name in clinical trial registries and scientific literature. It is also sometimes listed with combination partners such as PF-07104091 in certain study contexts.