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Trimodality Approach of Low Dose iOnizing Radiation With or Without Neoadjuvant Pembrolizumab and Prostatectomy for Men With Intermediate/High Risk Prostate Cancer (TALON)

NCT04569461 · Status: WITHDRAWN · Phase: PHASE2 · Type: INTERVENTIONAL

Last updated 2025-07-04

No results posted yet for this study

Summary

This study will enroll prostate cancer patients with an unfavorable intermediate- or high-risk diagnosis. The purpose of this study is to determine whether a regimen of pembrolizumab and low dose prostate radiation or low dose prostate radiation alone prior to a prostatectomy affects cells of the immune system and if it is a safe option for this stage of prostate cancer. Participants will be randomized 1:1 (like flipping a coin) to receive pembrolizumab, low dose prostate radiation and a prostatectomy or low dose prostate radiation and a prostatectomy. Pembrolizumab is an investigational drug that increases the ability of the immune system to kill tumor cells. Low dose radiation can alter the way tumor cells look to the immune cells. For example, the immune cells may express different proteins that make them more susceptible to immune cell killing or the structure of the tumor may be altered to allow the immune cells to infiltrate the tumor more thoroughly. The prostate tissue collected from the prostatectomy will be analyzed for differences in pathology and local immune cell infiltration, and participants will be followed for 2 years to watch for prostate specific antigen (PSA) recurrence and prostate cancer recurrence.

Conditions

Interventions

DRUG

pembrolizumab

400 mg of pembrolizumab (KEYTRUDA) will be given by IV every 6 weeks for 9 cycles, for approximately one year of study drug administration.

RADIATION

Low dose prostate radiation

A single dose of 2 Gy of radiation will be given to the prostate and seminal vesicles on approximately Week 7 for Arm A and approximately 2 weeks prior to the prostatectomy for Arm B.

PROCEDURE

Radical Prostatectomy

Robotic assisted laparoscopic prostatectomy (RALP) surgery will be performed at approximately Week 9 for Arm A and approximately 2 weeks after the low dose prostate radiation for Arm B. This surgery is part of the participants routine medical care.

Sponsors & Collaborators

Principal Investigators

  • Daniel George, MD · Duke University

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Sex
MALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-06-30
Primary Completion
2026-12-01
Completion
2026-12-01
FDA Drug
Yes

Countries

  • United States

Study Locations

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Entities

Drugs
Diseases
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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04569461 on ClinicalTrials.gov