A Study to Learn About the Safety of TALZENNA in People With Prostate Cancer.

Special Investigation of TALZENNA Capsules - Study on BRCA Mutation-Positive Metastatic Castration-Resistant Prostate Cancer -

The purpose of this study is to learn about the safety of TALZENNA in patients with BRCA mutation-positive metastatic castration-resistant prostate cancer. BRCA mutation positive means any changes to the BRCA gene. Metastasis means the cancer that has spread to other parts of the body. Castration-resistant prostate cancer means the prostate cancer that keeps growing even when the amount of male sex hormone in the body is reduced to very low levels. Prostate is a male sex organ.

The study is seeking for participants:

• with BRCA mutation-positive metastatic castration-resistant prostate cancer
• who have not used this study medicine before. All patients in this study will receive TALZENNA according to the prescriptions.

Patients will be followed up to 52 weeks (12 months) from the day of start of treatment start (Day 1). However, in cases where treatment has been completed or stopped less than 52 weeks (12 months) after the start of giving study medicine, the participants will be checked until completion (discontinuation) of treatment.

Study Overview

• Status: Active, not recruiting
• Conditions: Prostate Cancer

• Study Type: Observational
• Enrollment (Actual): 1

Contacts and Locations

Study Locations

• Japan
  • Tokyo, Japan
    • Pfizer Japan

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult; Older Adult
• Accepts Healthy Volunteers: No

• Sampling Method: Probability Sample

Study Population

Patients who satisfy the inclusion criteria

Description

Inclusion Criteria:

• Patients with BRCA mutation-positive metastatic castration-resistant prostate cancer
• No history of previous use of this drug

Exclusion Criteria:

• None

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of adverse drug reactions	For adverse drug reactions corresponding to myelosuppression, interstitial lung disease, thromboembolism, and secondary malignant tumour, the incidence, time of onset, grade, outcome etc. will be tabulated.	Up to 52 weeks

Collaborators and Investigators

• Sponsor: Pfizer
• Investigators: Study Director: Pfizer CT.gov Call Center, Pfizer

Publications and helpful links

Helpful Links

• To obtain contact information for a study center near you, click here.

Study record dates

Study Major Dates

• Study Start (Actual): July 11, 2025
• Primary Completion (Estimated): June 22, 2029
• Study Completion (Estimated): June 22, 2029

Study Registration Dates

• First Submitted: December 10, 2024
• First Submitted That Met QC Criteria: December 10, 2024
• First Posted (Actual): December 13, 2024

Study Record Updates

• Last Update Posted (Actual): November 17, 2025
• Last Update Submitted That Met QC Criteria: November 14, 2025
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Keywords: metastatic castration-resistant prostate cancer; BRCA mutation-positive
• Additional Relevant MeSH Terms: Urogenital Diseases; Genital Diseases; Genital Neoplasms, Male; Urogenital Neoplasms; Neoplasms by Site; Neoplasms; Genital Diseases, Male; Prostatic Diseases; Male Urogenital Diseases; Prostatic Neoplasms
• Other Study ID Numbers: C3441050

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.