Evaluation of Pembrolizumab in Lymphopenic Metastatic Breast Cancer Patients Treated With Metronomic Cyclophosphamide — CHEMOIMMUNE  

Metastatic Breast Cancer Clinical Trial

Official title: CHEMOIMMUNE - A Phase II Study Evaluating an Anti-PD1 Monoclonal Antibody (Pembrolizumab) in Lymphopenic Metastatic Breast Cancer Patients Treated With Metronomic Cyclophosphamide

Status Completed

Clinical Trial Summary

The investigators hypothesize that the administration of pembrolizumab combined to metronomic cyclophosphamide may be an interesting therapeutic option for female patients breast cancer with lymphopenia.

Include only patients with breast cancer with lymphopenia is based on the particularly poor prognosis of these patients. The approach suggested here is to deplete and active the immune response of these immunosuppressed patients. The combination of pembrolizumab and cyclophosphamide would provide a higher gain in anti-tumor response in these patients than in those without lymphopenia and in chemotherapy alone.

The investigators proposal is to conduct a multicentric, non-comparative, single arm, two-stage, Phase II trial in lymphopenic patients with metastatic breast cancer.

The study is divided in 2 parts:

• a safety run-in Phase aiming to evaluate the safety of the combination therapy pembrolizumab + metronomic cyclophosphamide based on the occurrence of severe toxicities.

• a two-stage Phase II aiming to evaluate the clinical activity of the combination therapy pembrolizumab + metronomic cyclophosphamide.

In both parts of the study, patients will receive cyclophosphamide (50 mg/day, daily, per os) and pembrolizumab (200 mg every 3 weeks, intravenously [IV]). The adverse events of the two drugs are well known.

Clinical Trial Description

The initiation of different stage of the study depend on the occurrences of severe toxicities in safety run-in phase and Clinical Benefit rate after 24 weeks in the two-stage Phase II of the study.

Both study drugs will continue to be administered as long as patient experience clinical benefit in the opinion of the investigator or symptomatic deterioration attributed to disease progression as determined by the investigator after an integrated assessment of radiographic data and clinical status or withdrawal of consent. ;

Related Conditions & MeSH terms

• Breast Neoplasms
• Metastatic Breast Cancer

• NCT number: NCT03139851
• Study type: Interventional
• Source: Centre Leon Berard
• Status: Completed
• Phase: Phase 2
• Start date: June 27, 2017
• Completion date: September 18, 2019