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Rinzimetostat

Phase 3

Metastatic Castration Resistant Prostate Cancer | Small molecule | Oncology |Oric Pharmaceuticals, Inc.|Trials Updated: Oct 5, 2026

Rinzimetostat development status

Highest phase Phase 3
Registered trials 2 across 1 sponsor since Jun 2022

Rinzimetostat target and mechanism

Molecular targetEED
Target class-Stat (Enzyme)
ModalitySmall molecule

Also known as ORIC-944

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials2
Total Enrollment875

FDA Designations

No designations recorded

Rinzimetostat clinical trials

Rinzimetostat · 2 trials · 2 indications

Phase 3 1Phase 1 1
NCT07723248A Study to Learn About the Investigational Drug Rinzimetostat (ORIC-944) in Patients With mCRPC Who Were Previously Treated With Abiraterone Acetate (Himalayas-1)Metastatic Castration Resistant Prostate Cancer
RECRUITING600 Analytics
PHASE3RECRUITING
A Study to Learn About the Investigational Drug Rinzimetostat (ORIC-944) in Patients With mCRPC Who Were Previously Treated With Abiraterone Acetate (Himalayas-1)
Metastatic Castration Resistant Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

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

Radiographic Progression Free Survival is defined as the time from the date of randomization to first evidence of radiographic progression as assessed in soft tissue by RECIST 1.1 or in bone per PCWG3 guideline by BICR, or death, whichever occurs first

Recommended Phase 2 Dose (RP2D)
12 months

RP2D as determined by interval 3+3 dose escalation design

Maximum plasma concentration (Cmax)
28 Days

PK of ORIC-944 single agent and in combination with an ARPI

Time to maximum observed concentration (Tmax)
28 Days

PK of ORIC-944 single agent and in combination with an ARPI

Area under the curve (AUC)
28 Days

PK of ORIC-944 single agent and in combination with an ARPI

Apparent plasma terminal elimination half-life (t1/2)
28 Days

PK of ORIC-944 single agent and in combination with an ARPI

Secondary Endpoints

Overall Survival (OS)
5 years
Objective response rate (ORR)
Randomization up to ~2 years
Duration of Response (DoR)
Randomization up to ~2 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Investigational ArmACTIVE_COMPARATORRinzimetostat + darolutamide
Physician's ChoiceACTIVE_COMPARATORControl Arm
Single Agent Dose EscalationEXPERIMENTALORIC-944 dosed orally on a continuous daily dosing regimen in 28-day cycles
Combination Dose EscalationEXPERIMENTALORIC-944 dosed orally on a continuous daily dosing regimen in 28-day cycles in combinations with abiraterone, apalutamide, darolutamide, or enzalutamide
Combination Dose OptimizationEXPERIMENTALCohort A and C: ORIC-944 dosed orally on a continuous daily dosing regimen in 28-day cycles in combination with apalutamide Cohort B and D: ORIC-944 dosed orally on a continuous daily dosing regimen in 28-day cycles in combination with darolutamide Combinations with abiraterone or enzalutamide may be conducted in the future

Interventions

NameTypeDescription
RinzimetostatDRUG400 mg once daily (QD)
DarolutamideDRUG600 mg twice daily (BID)
EnzalutamideDRUG160 mg once daily (QD)
DocetaxelDRUG75 mg/m2 intravenously (IV) every 21 days for up to 10 cycles
ORIC-944DRUGOral, once daily, continuous
Abiraterone acetate (Zytiga®) 250 mg or 500 mg tabletsDRUGOral, 1000 mg once daily, continuous
Apalutamide (Erleada™) 60 mg or 240 mg tabletsDRUGOral, 240 mg once daily, continuous
Darolutamide (Nubeqa®) 300 mg tabletsDRUGOral, 600 mg twice daily, continuous
Enzalutamide (Xtandi®) 40 mg capsules or 40 mg and 80 mg tabletsDRUGOral, 160 mg once daily, continuous
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites12

Inclusion Criteria: * Histologically or cytologically confirmed adenocarcinoma of the prostate without small cell features * Progressive disease in the setting of surgical or medical castration with evidence of disease progression on treatment with abiraterone acetate in the mCSPC setting or first ...

Countries:United StatesPuerto RicoAustraliaSpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWOct 5, 2026NCT07723248lastUpdatePostDate: changed
LOWOct 5, 2026NCT07723248lastUpdatePostDate: changed
LOWSep 3, 2026NCT07723248startDate: changed
LOWSep 3, 2026NCT07723248startDate: changed
LOWJul 24, 2026NCT07723248NEW_TRIAL: changed
LOWJul 24, 2026NCT07723248NEW_TRIAL: changed

Frequently asked questions about Rinzimetostat

What is Rinzimetostat used for?

Rinzimetostat is an investigational small molecule being studied for metastatic castration resistant prostate cancer and metastatic prostate cancer. It is being evaluated in patients whose disease has progressed after treatment with abiraterone acetate. It is not approved for any indication and remains in clinical development.

What does Rinzimetostat target?

Rinzimetostat targets EED, the embryonic ectoderm development protein, which is a component of the Polycomb repressive complex 2. EED is an enzyme, and Rinzimetostat belongs to the small molecule enzyme inhibitor class. By binding EED, the drug is designed to interfere with PRC2-mediated gene repression in prostate cancer cells.

Who is developing Rinzimetostat?

Rinzimetostat is being developed by Oric Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker ORIC. The company is running the clinical program for the drug in prostate cancer, including a Phase 3 study in metastatic castration resistant prostate cancer and a Phase 1 study in metastatic prostate cancer.

What phase is Rinzimetostat in?

Rinzimetostat is in Phase 3 development. The Phase 3 trial is the most advanced study of the drug, and a Phase 1 trial is also ongoing. Rinzimetostat is investigational and has not been approved by the FDA for any indication.

What clinical trials is Rinzimetostat in?

Rinzimetostat is being studied in two recruiting trials. The Phase 3 Himalayas-1 study, NCT07723248, enrolls about 600 men with metastatic castration resistant prostate cancer previously treated with abiraterone acetate in the United States and Puerto Rico. The Phase 1 study, NCT05413421, enrolls about 275 men with metastatic prostate cancer in the United States, Australia, Spain, and the United Kingdom.

Is Rinzimetostat the same as ORIC-944?

Yes, Rinzimetostat and ORIC-944 are two names for the same investigational drug. ORIC-944 is the earlier code name used by the developer, Oric Pharmaceuticals, while Rinzimetostat is the current name. Searches for either name refer to the same EED-targeting small molecule in prostate cancer trials.