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PF-06821497

Phase 3

Metastatic Castrate Resistant Prostate Cancer (mCRPC) | Small molecule | Oncology |Pfizer, Inc.|Last Updated: Aug 24, 2026

Target and mechanism

Target class-Stat (Enzyme)
ModalitySmall molecule

Also known as Mervometostat (PF-06821497), Mervometostat, Mevrometostat

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment600

FDA Designations

No designations recorded

Clinical trial landscape

PF-06821497 · 3 trials · 3 indications

Phase 3 2Phase 1 1
NCT06629779A Study to Learn How PF-06821497 (Mevrometostat) Works in Men With Metastatic Castration-resistant Prostate Cancer.Metastatic Castration-Resistant Prostate Cancer
RECRUITING900 Analytics
NCT06551324A Study to Learn About the Investigational Medicine Called PF-06821497 (Mevrometostat) in Men With mCRPC Who Were Previously Treated With Abiraterone Acetate for Prostate Cancer (MEVPRO-1).Metastatic Castrate Resistant Prostate Cancer (mCRPC)
ACTIVE NOT_RECRUITING600 Analytics
PHASE3RECRUITING
A Study to Learn How PF-06821497 (Mevrometostat) Works in Men With Metastatic Castration-resistant Prostate Cancer.
Metastatic Castration-Resistant Prostate CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Study to Learn About the Investigational Medicine Called PF-06821497 (Mevrometostat) in Men With mCRPC Who Were Previously Treated With Abiraterone Acetate for Prostate Cancer (MEVPRO-1).
Metastatic Castrate Resistant Prostate Cancer (mCRPC)Unlock trial analytics

Study Endpoints

Primary Endpoints

Radiographic Progression Free Survival (rPFS)
Randomization up to approximately 3 years

rPFS is defined as the time from the date of randomization to first objective evidence of radiographic progression as assessed in soft tissue per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 or in bone per Prostate Cancer Clinical Trials Working Group 3 (PCWG3) guidelines by BICR, or death, whichever occurs first.

Radiographic Progression Free Survival (rPFS) assessed by blinded independent central review (BICR) per RECIST v1.1 and Prostate Cancer Clinical Trials Working Group 3 (PCWG3)
Randomization up to approximately 2 years.

rPFS is defined as the time from the date of randomization to first objective evidence of radiographic progression as assessed in soft tissue per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 or in bone per Prostate Cancer Clinical Trials Working Group 3 (PCWG3) guidelines by BICR, or death, whichever occurs first.

Total recovery of radioactivity in urine, feces, and total excreta (urine + feces) as percentage of total radioactive dose administered
Period 1 pre-dose to maximum Day 14

To characterize the extent of excretion of total radioactivity in urine and feces following administration of a single oral dose of \[14C\]PF-06821497

Metabolic profiling/identification and determination of relative abundance of [14C]PF-06821497 and the metabolites of [14C]PF-06821497 in plasma, urine, and feces
Period 1 pre-dose to maximum Day 14

Amount of metabolites of \[14C\]PF-06821497 in plasma, urine, and feces

Secondary Endpoints

Overall survival (OS)
Randomization up to approximately 5 years
To demonstrate that PF-06821497 in combination with enzalutamide is superior to placebo in combination with enzalutamide in prolonging Time To Pain Progression (TTPP)
Randomization up to approximately 5 years
Objective Response Rate (ORR)
Randomization up to approximately 3 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm AEXPERIMENTALParticipants will receive PF-06821497 (875 mg) BID (twice daily) + enzalutamide 160 mg QD (once daily)
Arm BACTIVE_COMPARATORParticipants will receive Placebo BID (twice daily) + enzalutamide 160 mg QD (once daily)
Cohort 1EXPERIMENTALParticipants will receive one dose of \[14C\] PF-06821497 by mouth in Period 1. After a washout, participants will receive one dose of PF-06821497 by mouth and one intravenous (IV) infusion of \[14C\] PF-06821497 in Period 2

Interventions

NameTypeDescription
PF-06821497DRUGOral continuous
PlaceboDRUGOral continuous
EnzalutamideDRUGOral continuous
DocetaxelDRUG75 mg/m2 IV (every 21 days)
Oral [14C] PF-06821497DRUGA single oral dose of \[14C\] PF-06821497 will be administered as an extemporaneous suspension in Period 1
Oral PF-06821497DRUGA single oral dose of PF-06821497 will be administered as an extemporaneous oral suspension in Period 2
IV [14C] PF-06821497DRUGA single IV infusion of \[14C\] PF-06821497 will be administered at the Tmax after administration of the unlabeled oral dose of PF-06821497 in Period 2
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites236

Inclusion Criteria: * Histologically or cytologically confirmed adenocarcinoma of the prostate without small cell features. * Metastatic disease in bone documented on bone scan, or in soft tissue documented on CT/MRI scan. * Progressive disease in the setting of medical or surgical castration. * EC...

Countries:United StatesArgentinaBrazilBulgariaCanadaChileChinaCzechiaDenmarkFinlandFranceGermanyGreeceHungaryItalyJapanNetherlandsNew ZealandPolandSlovakiaSouth AfricaSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)United KingdomAustralia
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Recent Changes (Last 90 Days)

LOWAug 24, 2026NCT06629779lastUpdatePostDate: changed
LOWAug 24, 2026NCT06629779lastUpdatePostDate: changed
LOWAug 14, 2026NCT06629779lastUpdatePostDate: changed
LOWAug 14, 2026NCT06629779lastUpdatePostDate: changed
MEDIUMAug 11, 2026NCT06551324primaryCompletionDate: changed
MEDIUMAug 11, 2026NCT06551324primaryCompletionDate: changed
LOWJul 29, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 29, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 9, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 9, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 2, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 2, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 2, 2026NCT06629779lastUpdatePostDate: changed
LOWJul 2, 2026NCT06629779lastUpdatePostDate: changed
LOWJun 16, 2026NCT06629779lastUpdatePostDate: changed
LOWJun 16, 2026NCT06629779lastUpdatePostDate: changed
LOWJun 16, 2026NCT06629779lastUpdatePostDate: changed

Frequently asked questions about PF-06821497

What is Mervometostat used for?

Mervometostat is an investigational small molecule being developed by Pfizer for metastatic castration-resistant prostate cancer (mCRPC) and metastatic castration-sensitive prostate cancer (mCSPC). It is also being studied in healthy participants to understand how the drug is processed by the body.

How does Mervometostat work?

Mervometostat is a small molecule enzyme inhibitor, classified under the -stat (enzyme) target class. It is being studied to treat prostate cancer by targeting specific enzymes involved in cancer growth, though the exact molecular target is not disclosed in the available information.

Who makes Mervometostat?

Mervometostat is developed by Pfizer, Inc., a biopharmaceutical company listed on the New York Stock Exchange under the ticker symbol PFE. The drug is also known by the code name PF-06821497.

What phase is Mervometostat in?

Mervometostat is in Phase 1 clinical development for metastatic castration-resistant prostate cancer and metastatic castration-sensitive prostate cancer. It is also being studied in healthy participants. The drug is investigational and has not been approved by regulatory authorities.

What clinical trials is Mervometostat in?

Mervometostat is being studied in several clinical trials. NCT03460977 is a Phase 1 trial in mCRPC, small cell lung cancer, and follicular lymphoma. NCT06392230 is a completed Phase 1 trial in healthy participants. NCT06629779 is a Phase 3 trial in mCRPC, and NCT07028853 is a Phase 3 trial in mCSPC.

Is Mervometostat the same as PF-06821497?

Yes, Mervometostat is also known as PF-06821497. The drug is referred to by both names in clinical trial registries and scientific literature, with PF-06821497 being the code name used during early development.