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Talazoparib with enzalutamide

Phase 3

mCRPC | Small molecule | Oncology |Pfizer, Inc.|Last Updated: Aug 17, 2026

Target and mechanism

Molecular targetPARP1, PARP2
Target classInhibitor
ModalitySmall molecule

Also known as Talazoparib, Talazoparib Tosylate

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment1,054

FDA Designations

No designations recorded

Clinical trial landscape

Talazoparib with enzalutamide · 1 trial · 1 indication

Phase 3 1
NCT03395197Talazoparib + Enzalutamide vs. Enzalutamide Monotherapy in mCRPCmCRPC
ACTIVE NOT_RECRUITING1,054 Analytics
PHASE3ACTIVE NOT_RECRUITING
Talazoparib + Enzalutamide vs. Enzalutamide Monotherapy in mCRPC
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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 to N/A
SexMALE
Healthy VolunteersNo
Study Sites369

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)

LOWAug 17, 2026NCT03395197lastUpdatePostDate: changed
LOWAug 17, 2026NCT03395197lastUpdatePostDate: changed

Frequently asked questions about Talazoparib with enzalutamide

What is Talazoparib used for?

Talazoparib is an investigational small molecule being studied for the treatment of breast cancer, prostate cancer, metastatic prostate cancer, solid tumors, metastatic breast cancer, and metastatic castration-resistant prostate cancer (mCRPC). It is being developed by Pfizer, Inc. (PFE) and is currently in Phase 1 clinical development.

What does Talazoparib target?

Talazoparib targets PARP1 and PARP2, which are enzymes involved in DNA repair. It is classified as a PARP inhibitor. By inhibiting these targets, Talazoparib is being studied for its potential effects in various cancers, including breast and prostate cancers.

Who makes Talazoparib?

Talazoparib is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. The drug is currently in Phase 1 clinical trials for multiple oncology indications.

What phase is Talazoparib in?

Talazoparib is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. Clinical trials are ongoing to evaluate its safety and efficacy in patients with various solid tumors, including breast and prostate cancers.

What clinical trials is Talazoparib in?

Talazoparib has been studied in four clinical trials. Completed trials include NCT02997176, an open-label pharmacokinetics and safety study, and NCT03042910, a cardiac repolarization study. Active trials include NCT04039230, evaluating talazoparib with sacituzumab govitecan in metastatic breast cancer, and NCT04846478, studying talazoparib plus tazemetostat for mCRPC.

Is Talazoparib the same as Talazoparib Tosylate?

Yes, Talazoparib is also known as Talazoparib Tosylate. It may also be referred to as talazoparib with enzalutamide or talazoparib plus enzalutamide in combination therapy contexts. These names refer to the same investigational drug being developed by Pfizer.