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Enzalutamide

Phase 2

Castration-Resistant Prostate Carcinoma | Small molecule | Oncology |Merck & Company, Inc.|Last Updated: May 14, 2026

Target and mechanism

Molecular targetAR
Target classAntagonist
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment58

FDA Designations

No designations recorded

Clinical trial landscape

Enzalutamide · 1 trial · 5 indications

Phase 2 1
NCT02312557Pembrolizumab in Treating Patients With Metastatic Castration Resistant Prostate Cancer Previously Treated With EnzalutamideCastration-Resistant Prostate Carcinoma
ACTIVE NOT_RECRUITING58 Analytics
PHASE2ACTIVE NOT_RECRUITING
Pembrolizumab in Treating Patients With Metastatic Castration Resistant Prostate Cancer Previously Treated With Enzalutamide
Castration-Resistant Prostate CarcinomaUnlock trial analytics

Study Endpoints

Primary Endpoints

PSA Response, Defined by a PSA Decrease of at Least 50% Confirmed by a Second Measurement at Least 3 Weeks Later
Up to 30 days after completion of study treatment, up to approximately 2.5 years total.

One-sample binomial test will be used to assess whether the proportion of PSA response (PSA decrease of at least 50%) is significantly greater than 0.05. Univariable logistic regression analysis will be conducted to assess the association between immunological parameters and PSA response responses. Scale in logit will be assessed for all continuous parameters that are identified to be significantly associated with PSA response. Descriptive statistical analysis will be conducted. The proportion estimate will be reported with 95% confidence interval.

Secondary Endpoints

Changes in T Cell Activation as Measured in Whole Blood
Baseline to up to 4 weeks
Changes in T Cell Numbers as Measured in Whole Blood
Baseline to up to 4 weeks
Changes in T Cell Phenotype as Measured in Whole Blood
Baseline to up to 4 weeks
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Treatment (pembrolizumab)EXPERIMENTALINITIAL TREATMENT PHASE: Patients who are progressing on enzalutamide will receive pembrolizumab IV over 30 minutes on day 1. Treatment repeats every 3 weeks for 4 courses in the absence of disease progression or unacceptable toxicity. Patients continue to receive standard of care enzalutamide PO daily. MONITORING PHASE: After completion of the initial treatment phase, patients continue to receive standard of care enzalutamide PO daily for the duration of the trial. RETREATMENT PHASE: Patients with disease response or stability after the initial treatment phase will receive pembrolizumab IV over 30 minutes on day 1. Treatment repeats every 3 weeks for an additional 4 courses in the absence of disease progression or unacceptable toxicity. Patients continue to receive standard of care enzalutamide PO daily for the duration of the trial.

Interventions

NameTypeDescription
EnzalutamideDRUGGiven PO
Laboratory Biomarker AnalysisOTHERCorrelative studies
PembrolizumabBIOLOGICALGiven IV
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * ENTRY CRITERIA: Metastatic, castration resistant prostate cancer progressing on enzalutamide after initial response to enzalutamide * Histologically or cytologically confirmed adenocarcinoma of the prostate without pure small cell carcinoma; patients without histologically con...

Countries:United States
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Frequently asked questions about Enzalutamide

What is Enzalutamide used for?

Enzalutamide is being studied for the treatment of castration-resistant prostate carcinoma, including hormone-resistant prostate cancer, PSA progression, recurrent prostate carcinoma, and stage IV prostate adenocarcinoma. It is an investigational small molecule in Phase 2 clinical development for these oncology indications.

Who makes Enzalutamide?

Enzalutamide is being developed by Merck & Company, Inc., which trades under the ticker symbol MRK. The company is conducting clinical research on this small molecule for the treatment of castration-resistant prostate carcinoma.

What phase is Enzalutamide in?

Enzalutamide is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. It is currently being evaluated in an active clinical trial for patients with castration-resistant prostate cancer.

What clinical trials is Enzalutamide in?

Enzalutamide is being studied in clinical trial NCT02312557, titled 'Pembrolizumab in Treating Patients With Metastatic Castration Resistant Prostate Cancer Previously Treated With Enzalutamide.' This Phase 2 trial is active but not recruiting, with an enrollment of 58 male patients aged 18 years and older in the United States.

Is Enzalutamide the same as Enzalutamide 160 mg?

Yes, Enzalutamide is also known as Enzalutamide 160 mg. This alternative name refers to the same drug, which is being investigated for the treatment of castration-resistant prostate carcinoma.

Does Enzalutamide target a specific biomarker?

Yes, the clinical trial for Enzalutamide is biomarker-selected, meaning patients are chosen based on specific biomarker criteria. The trial is uncontrolled and not randomized or double-blinded, reflecting its early-stage design in studying this drug for prostate cancer.