Pembrolizumab +/- SD-101 in Hormone-Naïve Oligometastatic Prostate Cancer With RT and iADT

Prostatic Neoplasms Clinical Trial

Official title: Phase 2 Trial Pembrolizumab or Pembrolizumab in Combination With Intratumoral SD-101 Therapy in Patients With Hormone-Naïve Oligometastatic Prostate Cancer Receiving Stereotactic Body Radiation Therapy and Intermittent Androgen Deprivation Therapy

Status Active, not recruiting

Clinical Trial Summary

This is a non-comparative open-label multicenter Phase 2 clinical trial combining stereotactic body radiation therapy (SBRT) and pembrolizumab with or without intratumoral SD-101 in patients with newly diagnosed hormone-naive oligometastatic prostate cancer.

Clinical Trial Description

This randomized phase II trial studies how well androgen deprivation therapy, pembrolizumab, and stereotactic body radiation therapy with or without toll-like receptor 9 (TLR9) agonist SD-101 in treating patients with prostate cancer and cancer in all oligometastatic sites that has spread to other places in the body. Androgen can cause the growth of tumor cells. Androgen deprivation therapy, such as leuprolide acetate, prednisone, and abiraterone acetate may lessen the amount of androgen made by the body. Monoclonal antibodies, such as pembrolizumab, may interfere with the ability of tumor cells to grow and spread. Stereotactic body radiation therapy is a specialized radiation therapy that sends x-rays directly to the tumor using smaller doses over several days and may cause less damage to normal tissue. Colony-stimulating factors, such as TLR9 agonist SD-101, may increase the production of blood cells. It is not yet known whether giving androgen deprivation therapy, pembrolizumab, and stereotactic body radiation therapy with or without TLR9 agonist SD-101 may work better in treating patients with prostate cancer and cancer in all oligometastatic sites.

PRIMARY OBJECTIVES

• Cohort 1 (No longer recruiting)

--To assess the safety associated with giving RT and pembrolizumab with or without intratumoral SD-101.

• Cohort 2

• To continue to assess the safety associated with giving RT and pembrolizumab with or without intratumoral SD-101.

• To assess if the rate of PSA < nadir + 2 ng/mL at 15 months in patients with non-castrate levels of testosterone is greater than the historical control in each study arm.

SECONDARY OBJECTIVES

• To determine the rate of testosterone-PSA uncoupling in each study arm in cohort 2. Testosterone-PSA uncoupling is defined as PSA < 50% baseline and < 20ng/mL for at least 3 months after testosterone recovers to >150 ng/dL. In patients with metastatic hormone sensitive prostate cancer off hormonal therapy, >90% patient are expected to have PSA increase to > 50% baseline after 3 months of testosterone recovery.

• To estimate time to clinical progression

• To estimate progression-free survival (PFS) in each study arm

EXPLORATORY OBJECTIVE

• To assess peripheral and tumor-based biomarkers of response and resistance in both cohorts.

• To define the treatment-induced effects on circulating immune cells in both cohorts.

• To explore remodeling of circulating T cell repertoire in both cohorts.

• To explore the concordance of Prostate-Specific Membrane Antigen (PSMA) - Positron Emission Tomography (PET) scanning with conventional imaging in oligometastatic prostate cancer patients in both cohorts. ;

Related Conditions & MeSH terms

• Prostatic Neoplasms

• NCT number: NCT03007732
• Study type: Interventional
• Source: University of California, San Francisco
• Status: Active, not recruiting
• Phase: Phase 2
• Start date: May 17, 2017
• Completion date: October 31, 2024