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Nivolumab in Prostate Cancer With DNA Repair Defects (ImmunoProst Trial)

NCT03040791 · Status: UNKNOWN · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 38

Last updated 2021-08-26

No results posted yet for this study

Summary

Prostate Cancer (PC) is the most frequent cancer in men, accounting for 21% of new cases of cancer in men in the United States. Among the four most incident tumors (breast, lung and colorectal cancer); prostate cancer is the only that does not have any predictive biomarker to guide the treatment. Even though the molecular heterogeneity of PC is well-documented, treatment has not been molecularly stratified and the need for genetic prognostic and predictive markers is critical.

DNA repair defects (DRD), mainly in the Homologous Recombination (HR) pathway (such as BRCA1, BRCA2, ATM and CHEK2) are emerging as potential biomarkers in prostate cancer. It is well known BRCA1 and BRCA2 carriers have better Progression-Free Survival (PFS) and Overall Survival (OS) than non-carriers in ovarian cancer. Differently than ovarian tumors that BRCA mutations provides a good prognosis, PC patients who harbor HR defects have a higher Gleason score 6, an increased risk of recurrence and poor prognosis. The predictive role of DRD in PC was demonstrated in a recent trial using Olaparib, a PARP inhibitor, in DRD carriers. This trial showed 88% of response rate with Olaparib, a PARP inhibitor that acts in HR pathway by synthetic lethality.

Recent data demonstrated important association between HR deficient high-grade serous ovarian cancer (HGSOC), high neoantigen load and high expression of PD-1/PD-L1 compared with HR proficient HGSOCs 10. This study showed that BRCA1 and BRCA2 mutations increase the number of tumor-infiltrating lymphocytes (TILs) and confer a better prognosis. The unprecedented success of immunotherapy in malignant disorders has provided evidence that the patient's immune system can be improved to attack established tumors, mainly melanoma, non-small cell lung cancer and kidney cancer. A high mutational burden increases the likelihood of the development of specific neoepitopes that would confer clinical benefit from CTLA-4 and PD-1 blockade.

These data showed that specific DNA repair defects increase the mutational burden, the expression of PD-1/PD-L1 and TILs; and could improve the response to immunotherapy in cancer. This rationale was already tested in a trial that evaluated the PD-1 checkpoint inhibitor Pembrolizumab in mismatch-repair deficient patients, a kind of DNA repair defect by definition. This important trial showed that this DRD predicted clinical benefit of immune checkpoint blockade in many types of cancer, especially colorectal cancer.

Conditions

Interventions

DRUG

Nivolumab

Nivolumab

Sponsors & Collaborators

Principal Investigators

  • Pedro Isaacsson, MD · Hospital Moinhos de Vento

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Sex
MALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2018-06-01
Primary Completion
2022-01-01
Completion
2022-03-01
FDA Drug
Yes

Countries

  • Brazil

Study Locations

More Related Trials

Entities

Drugs
Diseases
Companies

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 NCT03040791 on ClinicalTrials.gov