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talazoparib plus enzalutamide

Phase 3

Prostate Cancer | Small molecule | Oncology |Pfizer, Inc.|Last Updated: Sep 4, 2026

Target and mechanism

Molecular targetPARP1, PARP2
Target classInhibitor
ModalitySmall molecule

Also known as Talazoparib, Talazoparib with enzalutamide, Talazoparib Tosylate

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials2
Total Enrollment727

FDA Designations

No designations recorded

Clinical trial landscape

talazoparib plus enzalutamide · 2 trials · 1 indication

Phase 3 1Phase 2 1
NCT04821622Study of Talazoparib With Enzalutamide in Men With DDR Gene Mutated mCSPCProstate Cancer
ACTIVE NOT_RECRUITING599 Analytics
PHASE3ACTIVE NOT_RECRUITING
Study of Talazoparib With Enzalutamide in Men With DDR Gene Mutated mCSPC
Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

radiological Progression-Free Survival
randomization up to 3 years

time from the date of randomization to first objective evidence of radiographic progression or death, whichever occurs first

Best Objective Response Rate (ORR)
From first dose of study drug to best overall soft tissue response CR or PR (maximum duration of 25 months)

Best ORR was defined as the percentage of participants with best overall soft tissue response of complete response (CR) or partial response (PR) as per RECIST1.1 by an independent central review. RECIST 1.1 criteria, CR: disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than 10 millimeter (mm). Disappearance of all non-target lesions and normalization of tumor marker level. All lymph nodes must be non-pathological in size (less than 10 mm short axis); PR: at least 30 percent (%) decrease in sum of diameters of target lesions taking as reference baseline sum diameters.

Secondary Endpoints

Overall Survival
randomization up to 4 years
Objective response in measurable soft tissue disease
randomization up to 3 years
Duration of response in measurable soft tissue disease
randomization up to 3 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm 1EXPERIMENTALTalazoparib plus enzalutamide
Arm 2ACTIVE_COMPARATORPlacebo plus enzalutamide
TalazoparibEXPERIMENTALTalazoparib 1 mg daily

Interventions

NameTypeDescription
talazoparib plus enzalutamideDRUGexperimental arm
Placebo plus enzalutamideDRUGActive comparator arm
TalazoparibDRUG1 mg daily
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites313

Inclusion Criteria: 1. Male participants at least 18 years of age at screening (20 years for Japan, 19 years for Republic of Korea). 2. Histologically or cytologically confirmed adenocarcinoma of the prostate without neuroendocrine differentiation, small cell or signet cell features. If the partici...

Countries:United StatesArgentinaAustraliaBelgiumBulgariaCanadaChinaCzechiaFinlandFranceGermanyHungaryIndiaItalyJapanMexicoNetherlandsNorwayRussiaSlovakiaSouth AfricaSouth KoreaSpainTaiwanTurkey (Türkiye)UkraineUnited KingdomAustriaBrazilPoland
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Competitive Landscape -Prostate Cancer 254 trials

Recent Changes (Last 90 Days)

LOWSep 4, 2026NCT04821622lastUpdatePostDate: changed
LOWAug 17, 2026NCT04821622lastUpdatePostDate: changed
LOWAug 17, 2026NCT04821622lastUpdatePostDate: changed
LOWJul 22, 2026NCT04821622lastUpdatePostDate: changed
LOWJul 22, 2026NCT04821622lastUpdatePostDate: changed

Frequently asked questions about talazoparib plus enzalutamide

What is Talazoparib used for?

Talazoparib is an investigational small molecule PARP inhibitor being studied in oncology. Clinical trials have evaluated it in advanced solid tumors, breast neoplasms, metastatic breast cancer with BRCA mutations, and prostate cancer with DDR gene mutations. It is being developed by Pfizer, Inc. (PFE).

What does Talazoparib target?

Talazoparib targets PARP, which stands for poly (ADP-ribose) polymerase. As a PARP inhibitor, it interferes with DNA repair mechanisms in cancer cells. This target class is commonly studied in tumors with BRCA or other DNA damage response gene mutations.

Who makes Talazoparib?

Talazoparib is being developed by Pfizer, Inc., which trades under the ticker symbol PFE. The company is conducting clinical trials of the drug across multiple countries, including the United States, Japan, China, and various European nations.

What phase is Talazoparib in?

Talazoparib is in Phase 1 clinical development, with completed Phase 1 studies in Japanese and Chinese patients with advanced solid tumors. It has also been studied in Phase 3 trials for breast cancer and prostate cancer, though the drug remains investigational and not approved.

What clinical trials is Talazoparib in?

Talazoparib has been studied in four clinical trials. NCT01945775 was a Phase 3 study in advanced breast cancer with BRCA mutations. NCT03343054 and NCT04635631 were Phase 1 studies in Japanese and Chinese patients with advanced solid tumors. NCT04821622 is an active Phase 3 trial in prostate cancer.

Is Talazoparib the same as Talazoparib Tosylate?

Yes, Talazoparib is also known as Talazoparib Tosylate. It is sometimes referred to as talazoparib with enzalutamide or talazoparib plus enzalutamide when studied in combination. These names refer to the same investigational drug.