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Talazoparib with enzalutamide

Phase 3

mCRPC | Small molecule | Other |Pfizer, Inc.|Last Updated: Apr 22, 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
RandomizedDouble-BlindACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment1,054
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03395197Talazoparib + Enzalutamide vs. Enzalutamide Monotherapy in mCRPCPHASE3 ACTIVE NOT_RECRUITING 1,054Dec 18, 2017Jun 30, 2027Apr 22, 2026368 United States, Argentina +24
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Study Endpoints
Primary Endpoints
Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Occuring Within the First 66 Days of Dosing - Part 1
Post dose on Day 1 up to Day 66 in Part 1

An adverse event (AE) was any untoward medical occurrence in a participant who received study intervention without regard to possibility of causal relationship. TEAEs are defined as newly occurring AEs or those worsening after first dose. As per Common Terminology Criteria for Adverse Events (CTCAE) version 4, Grade 1= mild AE; Grade 2= moderate AE; Grade 3= severe AE; Grade 4= life-threatening or disabling AE; Grade 5= death related to an AE. Serious TEAE (SAE) was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. SAEs were determined according to the investigator's assessment. Results as of 16 Aug 2022 are reported.

Number of Participants With All-Causality Clustered Treatment-Emergent Cytopenias by Preferred Term (PT) and Max CTCAE Grade Occuring Within the First 66 Days of Dosing - Part 1
Post dose on Day 1 up to Day 66 in Part 1

An AE was any untoward medical occurrence in a participant who received study intervention without regard to possibility of causal relationship. TEAEs are defined as newly occurring AEs or those worsening after first dose. As per CTCAE version 4, Grade 1=mild AE; Grade 2=moderate AE; Grade 3=severe AE; Grade 4=life-threatening or disabling AE; Grade 5=death related to an AE. Medical Dictionary for Regulatory Activities (MedDRA) v25.0 coding dictionary applied. PTs for the cluster terms are: ANEMIA, including Anemia, Hematocrit decreased, Hemoglobin decreased, and Red blood cell count decreased; THROMBOCYTOPENIA, including, Thrombocytopenia and Platelet count decreased; NEUTROPENIA, including Febrile neutropenia, Neutropenia and Neutrophil count decreased; LEUKOPENIA, including Leukopenia, White blood cell count decreased. Events in any grade with at least 1 occurrence in participants are reported for this outcome measure. Results as of 16 Aug 2022 are reported.

Number of Participants With All-Causality TEAEs During the Overall Period of Part 1
Post dose on Day 1 up to 28 days after the last dose of study intervention, or before new systemic antineoplastic therapy, whichever occurred first (maximum of 235.14 weeks)

An adverse event (AE) was any untoward medical occurrence in a participant who received study intervention without regard to possibility of causal relationship. TEAEs are defined as newly occurring AEs or those worsening after first dose. As per CTCAE version 4, Grade 1= mild AE; Grade 2= moderate AE; Grade 3= severe AE; Grade 4= life-threatening or disabling AE; Grade 5= death related to an AE. Serious TEAE (SAE) was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. SAEs were determined according to the investigator's assessment. Results as of 16 Aug 2022 are reported.

Number of Participants With Treatment-Related TEAEs During the Overall Period of Part 1
Post dose on Day 1 up to 28 days after the last dose of study intervention, or before new systemic antineoplastic therapy, whichever occurred first (maximum of 235.14 weeks)

An AE was any untoward medical occurrence in a participant who received study intervention without regard to possibility of causal relationship. TEAEs are defined as newly occurring AEs or those worsening after first dose. Treatment-related AE was any untoward medical occurrence attributed to study intervention in a participant who received study intervention. As per CTCAE version 4, Grade 1= mild AE; Grade 2= moderate AE; Grade 3= severe AE; Grade 4= life-threatening or disabling AE; Grade 5= death related to an AE. An SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. SAEs were determined according to the investigator's assessment. Results as of 16 Aug 2022 are reported.

Number of Participants With All-Causality Clustered Treatment-Emergent Cytopenias by PT and Max CTCAE Grade Occuring Anytime After Dosing - Part 1
Post dose on Day 1 up to 28 days after the last dose of study intervention, or before new systemic antineoplastic therapy, whichever occurred first (maximum of 235.14 weeks)

An AE was any untoward medical occurrence in a participant who received study intervention without regard to possibility of causal relationship. TEAEs are defined as newly occurring AEs or those worsening after first dose. As per CTCAE version 4, Grade 1=mild AE; Grade 2=moderate AE; Grade 3=severe AE; Grade 4=life-threatening or disabling AE; Grade 5=death related to an AE. MedDRA v25.0 coding dictionary applied. PTs for the cluster terms are: ANEMIA, including Anemia, Hematocrit decreased, Hemoglobin decreased, and Red blood cell count decreased; THROMBOCYTOPENIA, including, Thrombocytopenia and Platelet count decreased; NEUTROPENIA, including Febrile neutropenia, Neutropenia and Neutrophil count decreased; LEUKOPENIA, including Leukopenia, White blood cell count decreased. Events in any grade with at least 1 occurrence in participants are reported for this outcome measure. Results as of 16 Aug 2022 are reported.

Number of Participants With Treatment-Related Clustered Treatment-Emergent Cytopenias by PT and Max CTCAE Grade in >=10% of Participants Occuring Anytime After Dosing - Part 1
Post dose on Day 1 up to 28 days after the last dose of study intervention, or before new systemic antineoplastic therapy, whichever occurred first (maximum of 235.14 weeks)

An AE was any untoward medical occurrence in a participant who received study intervention without regard to possibility of causal relationship. TEAEs are newly occurring AEs or those worsening after first dose. Treatment-related AE was any AE attributed to study intervention in a participant who received study intervention. As per CTCAE version 4, Grade 1=mild; Grade 2=moderate; Grade 3=severe; Grade 4=life-threatening or disabling; Grade 5=death related to an AE. MedDRA v25.0 coding dictionary applied. PTs for the cluster terms are: ANEMIA, including Anemia, Hematocrit decreased, Hemoglobin decreased, and Red blood cell count decreased; THROMBOCYTOPENIA, including, Thrombocytopenia and Platelet count decreased; NEUTROPENIA, including Febrile neutropenia, Neutropenia and Neutrophil count decreased; LEUKOPENIA, including Leukopenia, White blood cell count decreased. Events in any grade with incidence in \>=10% of participants are reported. Results as of 16 Aug 2022 are reported.

Blinded Independent Central Review (BICR) Assessed Radiographic Progression-Free Survival (rPFS) Per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 for All-Comers - Part 2 Cohort 1
From the start of treatment to the time of first documented progression, or death (maximum up to 42 months)

rPFS is defined as the time from the date of randomization to first objective evidence of radiographic progression as assessed in soft tissue per RECIST 1.1, or death, whichever occurs first. Soft tissue disease status was assessed at regular intervals during the course of the study by computed tomography (CT) of chest and CT or magnetic resonance imaging (MRI) of abdomen and pelvis. Progression is defined using RECIST 1.1 as a \>=20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions. Results as of 16 Aug 2022 are reported for this outcome measure.

BICR Assessed rPFS Per RECIST 1.1 in Patients With DDR Deficiencies - Part 2
From the start of treatment to the time of first documented progression, or death (maximum up to 38 months)

rPFS is defined as the time from the date of randomization to first objective evidence of radiographic progression as assessed in soft tissue per RECIST 1.1, or death, whichever occurs first. Soft tissue disease status was assessed at regular intervals during the course of the study by CT of chest and CT or MRI of abdomen and pelvis. Results as of 03 Oct 2022 are reported for this outcome measure.

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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Combination armEXPERIMENTALTalazoparib plus enzalutamide
Monotherapy armACTIVE_COMPARATOREzalutamide plus placebo
Interventions
NameTypeDescription
Talazoparib with enzalutamideDRUGTalazoparib 0.5 mg/day plus enzalutamide 160mg/day
Placebo with enzalutamideDRUGPlacebo plus enzalutamide 160 mg/day
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Eligibility Criteria
Age Range18 Years — N/A
SexMALE
Healthy VolunteersNo
Study Sites368

Inclusion Criteria: Histologically or cytologically confirmed adenocarcinoma of the prostate without small cell or signet cell features Asymptomatic or mildly symptomatic metastatic castration resistant prostate cancer (mCRPC) (score on BPI-SF Question #3 must be \< 4). For enrollment into Part 2...

Countries:United StatesArgentinaAustraliaBelgiumBrazilCanadaChileChinaCzechiaFinlandFranceGermanyHungaryIsraelItalyJapanNew ZealandNorwayPeruPolandPortugalSouth AfricaSouth KoreaSpainSwedenUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT03395197primaryCompletionDate: changed
LOWMay 24, 2026NCT03395197studyFirstPostDate: changed