Niraparib Before Surgery in Treating Patients With High Risk Localized Prostate Cancer and DNA Damage Response Defects

Phase II Trial of PARP Inhibitor Niraparib for Men With High Risk Prostate Cancer and DNA Damage Response Defects

This phase II trial studies how well niraparib, when given before surgery, works in treating patients with high risk prostate cancer that has not spread to other parts of the body (localized) and alterations in deoxyribonucleic acid (DNA) repair pathways. Niraparib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.

Study Overview

• Status: Terminated
• Conditions: BRCA1 Gene Mutation; BRCA2 Gene Mutation; Prostate Carcinoma; RAD51C Gene Mutation; BRIP1 Gene Mutation; ATM Gene Mutation; CHEK2 Gene Mutation; NBN Gene Mutation; RAD51 Gene Mutation; CDK12 Gene Mutation; CHEK1 Gene Mutation; DNA Damage Response Gene Mutation; DNA Repair Gene Mutation; FANCA Gene Mutation; FANCD2 Gene Mutation; FANCL Gene Mutation; GEN1 Gene Mutation
• Intervention / Treatment: Drug: Niraparib; Drug: Niraparib Tosylate Monohydrate; Procedure: Radical Prostatectomy

Detailed Description

PRIMARY OBJECTIVES:

I. To assess the impact of neoadjuvant niraparib tosylate monohydrate (niraparib) therapy prior to radical prostatectomy (RP) on pathologic tumor stage, frequency of lymph node metastases and positive margin rates for patients undergoing radical prostatectomy for high-risk, clinically localized prostate cancer with alterations in DNA repair pathways.

SECONDARY OBJECTIVE:

I. To assess 5-year biochemical recurrence in subjects with high-risk prostate cancer and DNA-damage response defects after prostatectomy.

OUTLINE:

Patients receive niraparib orally (PO) once daily (QD) on days 1-28. Treatment repeats every 28 days for up to 3 cycles in the absence of disease progression or unacceptable toxicity. Following completion of treatment, patients then undergo standard of care surgery.

After completion of study treatment, patients are followed up at 30 days, every 3 months for 2 years, and then every 6 months for up to 3 years.

• Study Type: Interventional
• Enrollment (Actual): 11
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • California
    • Sacramento, California, United States, 95817
      • University of California Davis Comprehensive Cancer Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Ability to understand and willingness to sign an informed consent form
• Ability to adhere to the study visit schedule and other protocol requirements
• Patients must have histologically or cytologically confirmed prostate cancer that is clinically localized as defined by negative cross-section imaging and/or bone scan, and classified as high or very high risk per National Comprehensive Cancer Network (NCCN) guideline
• Eastern Cooperative Oncology Group (ECOG) performance status (PS) score of 0 or 1
• Life expectancy >= 10 years
• Men who have selected radical prostatectomy as the primary treatment for their prostate cancer
• Prostate cancer tumors with alterations in key DNA repair genes. This will include at least one alteration in a gene involved in DNA repair primarily through the homologous recombination pathway including BRCA1/2, ATM, CHEK1/2 FANCA, FANCD2, FANCL, GEN1, NBN, PALB2, RAD51, RAD51c, and BRIP1. Mutations will be selected that are known or likely pathogenic. Mean allele frequencies will be assessed to estimate mono versus biallelic loss of function. Patients with biallelic deletions or mutations will be prioritized for inclusion to make up at least 30% of the enrollment (i.e., 10 patients) to gauge response in this group over monoallelic loss. Final inclusion will be determined by the principal investigator
• Must be able to swallow whole capsules

• To avoid risk of drug exposure through the ejaculate, male subjects (even if they have undergone a successful vasectomy) must agree while on study therapy (including during dose interruptions) and for 3 months following the last dose of study drug to:

  • Use a condom during sexual activity or practice complete sexual abstinence
  • Not donate sperm
• Absolute neutrophil count (ANC) >= 1.5 x 10^9/L (obtained =< 14 days of the first study treatment)
• Platelet count >= 100 x 10^9/L (obtained =< 14 days of the first study treatment)
• Hemoglobin >= 9 g/dL (may have been transfused) (obtained =< 14 days of the first study treatment)
• Total bilirubin level =< 1.5 x the upper limit of normal (ULN) range (obtained =< 14 days of the first study treatment)
• Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels =< 2.5 x ULN or AST and ALT levels =< 5 x ULN (for subjects with documented metastatic disease to the liver) (obtained =< 14 days of the first study treatment)
• International normalized ratio (INR) and activated partial thromboplastin time (aPTT) =< 1.5 x ULN (for patients on anticoagulation they must be receiving a stable dose for at least 1 week prior to randomization) (obtained =< 14 days of the first study treatment)
• Creatinine clearance > 30 mL/min by Cockcroft-Gault formula (or local institutional standard method) (obtained =< 14 days of the first study treatment)

Exclusion Criteria:

• Any condition that would prohibit the understanding or rendering of informed consent
• Prior treatment for prostate cancer
• Prior treatment with a PARP inhibitor
• Prior treatment with androgen deprivation therapy (luteinizing hormone-releasing hormone [LHRH] agonist/antagonist), antiandrogen (e.g., bicalutamide, nilutamide, enzalutamide, apalutamide), or androgen synthesis inhibitor (e.g., abiraterone, orteronel)
• Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the trial, interfere with the subject's participation for the full duration of the trial, or is not in the best interest of the subject to participate, in the opinion of the treating investigator
• Uncontrolled concomitant disease that in the opinion of the investigator would interfere with the patient's safety or compliance on trial
• Severe infection that in the opinion of the investigator would interfere with the patient's safety or compliance on trial within 4 weeks prior to enrollment
• Known allergies, hypersensitivity, or intolerance to niraparib or its excipients (refer to investigator's brochure)
• Known disorder affecting gastrointestinal absorption
• Corrected QT interval by the Fridericia correction formula (QTcF) on the screening electrocardiography (ECG) > 450 msec
• Receiving concomitant medications that prolong QTc and are unable to discontinue use while receiving study drug
• History of clinically significant ventricular arrhythmias (e.g., ventricular tachycardia, ventricular fibrillation, torsades de pointes)

• Known human immunodeficiency virus (HIV) positive subjects with 1 or more of the following:

  • Not receiving antiretroviral therapy
  • A change in antiretroviral therapy within 6 months of the start of screening (except if, after consultation with the sponsor, a change is made to avoid a potential drug-drug interaction with the study drug)
  • Receiving antiretroviral therapy that may interfere with the study drug (consult the principal investigator [PI] for review of medication prior to enrollment)
  • CD4 count < 350 at screening
  • An acquired immunodeficiency syndrome-defining opportunistic infection within 6 months of the start of screening

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Treatment (niraparib); Patients receive niraparib PO QD on days 1-28. Treatment repeats every 28 days for up to 3 cycles in the absence of disease progression or unacceptable toxicity. Following completion of treatment, patients then undergo standard of care surgery.	Drug: Niraparib; Given PO; Other Names: MK-4827; MK4827; Drug: Niraparib Tosylate Monohydrate; Given PO; Other Names: Zejula; Procedure: Radical Prostatectomy; Undergo standard of care surgery; Other Names: Prostatovesiculectomy

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Pathologic Response Rate (pRR)	Number of participants who achieve complete pathologic response defined as no tumor identified on hematoxylin and eosin (H&E) stained sections in participants who receive neoadjuvant niraparib therapy prior to radical prostatectomy (RP).	Up to the time of radical prostatectomy procedure, about 5 months from start of treatment.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Biochemical Prostate Specific Antigen (PSA) Progression Free Survival	Number of participants who achieve biochemical (PSA) progression free survival (bPFS).	Up to about 5 years from start of treatment.

Collaborators and Investigators

• Sponsor: University of California, Davis
• Collaborators: National Cancer Institute (NCI); Janssen, LP
• Investigators: Principal Investigator: Marc Dall'Era, University of California, Davis

Publications and helpful links

General Publications

• Montgomery B, Mostaghel EA. Neoadjuvant Therapy Prior to Prostatectomy: Is the Glass Half Full? Eur Urol. 2023 Jun;83(6):519-520. doi: 10.1016/j.eururo.2023.01.021. Epub 2023 Jan 27. No abstract available.

Helpful Links

• Learn more or sign up for the study here!

Study record dates

Study Major Dates

• Study Start (Actual): February 25, 2020
• Primary Completion (Actual): January 10, 2024
• Study Completion (Actual): November 7, 2025

Study Registration Dates

• First Submitted: July 22, 2019
• First Submitted That Met QC Criteria: July 23, 2019
• First Posted (Actual): July 24, 2019

Study Record Updates

• Last Update Posted (Actual): May 14, 2026
• Last Update Submitted That Met QC Criteria: May 12, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• 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; Poly(ADP-ribose) Polymerase Inhibitors; Antineoplastic Agents; Molecular Mechanisms of Pharmacological Action; Enzyme Inhibitors; niraparib
• Other Study ID Numbers: 1412676; P30CA093373 (U.S. NIH Grant/Contract); NCI-2019-04365 (Registry Identifier: CTRP (Clinical Trial Reporting Program)); UCDCC#279 (Other Identifier: University of California Davis Comprehensive Cancer Center)

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No