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Mervometostat

Phase 1

Metastatic Castration Resistant Prostate Cancer (mCRPC) | Small molecule | Oncology |Pfizer, Inc.|Last Updated: Jun 5, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDBiomarker
Total Trials1
Total Enrollment453
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03460977A Study of Mevrometostat for Treatment of Relapsed/Refractory SCLC, Castration Resistant Prostate Cancer, and Follicular LymphomaPHASE1 RECRUITING 453Apr 17, 2018Jul 7, 2029Jun 5, 202682 United States, Bulgaria +6
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Study Endpoints
Primary Endpoints
Percentage of patients with dose limiting toxicities (DLTs) to determine the maximum tolerated dose (MTD)
Baseline up to 90 days

First cycle DLTs will be utilized to determine the MTD

Overall safety profile including adverse events
Baseline up to approximately 2 years

Adverse Events will be graded by National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE version \[4.03\])

Preliminary efficacy determination as evaluated by disease specific response criteria
Through study completion, approximately 2 years past last patient first visit.

Objective response using Response Evaluation Criteria in Lymphoma (RECIL) for lymphoma, Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 for solid tumors including Small Cell Lung Cancer (SCLC) and Prostate Cancer Working Group 3 (PCWG3) for Castration Resistant Prostate Cancer (CRPC). Progression-free survival in Part 2B in patients with CRPC.

Overall safety profile including laboratory abnormalities
Baseline up to approximately 2 years

Laboratory abnormalities as characterized by type, frequency, severity (as graded by NCI CTCAE version \[4.03\]), and timing.

Overall safety profile including vital signs
Baseline up to approximately 2 years

Vital sign changes from baseline including blood pressure, heart rate, ECG changes.

Evaluate time to event mevrometostat and enzalutamide vs enzalutamide alone including radiographic prgression free survival
Baseline until disease progression or death or through study completion (approx 2 years)

PCWG3

Secondary Endpoints
Evaluate time to event anti-tumor activity of mevrometostat including progression-free survival (PFS), PSA50, Duration of Response (DoR), Time to first skeletal related event and Time to symptomatic skeletal related event, depending on tumor type.
Baseline and every 21 days through time of confirmed disease progression, unacceptable toxicity, or through study completion, approximately 2 years.
Evaluate overall survival
Baseline up to approximately 2 years
Pharmacokinetic Parameters: Maximum Observed Plasma Concentration (Cmax)
At specific timepoints from Cycle 1 day 1 to End of Treatment visit
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Dose Escalation (Part 1A)EXPERIMENTALParticipants with SCLC, CRPC and FL will receive mevrometostat at escalating dose levels
Dose Escalation (Part 1B)EXPERIMENTALParticipants with FL will receive mevrometostat at escalating dose levels
Dose Escalation (Part 1C)EXPERIMENTALParticipants with mCRPC will receive mevrometostat at escalating dose levels.
Dose Escalation (Part 2A)EXPERIMENTALParticipants with mCRPC and SCLC will receive mevrometostat at escalating dose levels in combination with SOC.
Dose Expansion (Part 2B)EXPERIMENTALParticipants with CRPC will receive mevrometostat in combination with SOC or SOC alone.
Japan CohortEXPERIMENTALParticipants with CRPC will receive mevrometostat at one or two doses
China cohortEXPERIMENTALParticipants will receive mevrometostat at one or two doses
Dose Expansion (Part 2C)EXPERIMENTALParticipants with mCRPC will receive mevrometostat at a different dose/dosing regimen than that of Part 2B in combination with SOC
BE SubstudyEXPERIMENTALIn the assessment phase, each enrolled participant will receive single doses of the 2 different mevrometostat formulations in 3 periods with alternating dosing and washout between each dose. In the maintenance phase, each participant will receive mevrometostat 2 times a day and enzalutamide 1 time a day.
DDI SubstudyEXPERIMENTALThe DDI substudy assessment phase will consist of 2 Cohorts, Cohort 1 (monotherapy cohort) and Cohort 2 (combination cohort). In the Cohort 1 assessment phase, each enrolled participant will receive a combination of mevrometostat and itraconazole based on preset schedule. In the Cohort 2 assessment phase, each enrolled participant will receive a combination of mevrometostat, enzalutamide, and itraconazole based on preset schedule. In the maintenance phase, each participant will receive mevrometostat 2 times a day and enzalutamide 1 time a day.
Interventions
NameTypeDescription
Mervometostat (PF-06821497)DRUGOral continuous
EnzalutamideDRUGOral continuous
ItraconazoleDRUGOral solution
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites82

Part 1 and Part 2 (Closed for enrollment). Part 3 Key Inclusion Criteria: * Histological or cytological diagnosis of castration resistant prostate cancer. * Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) of 0-2 with expected life expectancy of at least 6 months. * Adequate bone ...

Countries:United StatesBulgariaChinaJapanPolandRussiaSouth KoreaSpain
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Recent Changes (Last 90 Days)
LOWJun 5, 2026NCT03460977lastUpdatePostDate: changed
LOWJun 5, 2026NCT03460977lastUpdatePostDate: changed
LOWJun 5, 2026NCT03460977lastUpdatePostDate: changed
LOWJun 5, 2026NCT03460977lastUpdatePostDate: changed
LOWMay 26, 2026NCT03460977primaryCompletionDate: changed
LOWMay 24, 2026NCT03460977studyFirstPostDate: changed