Milademetan and Fulvestrant in GATA3-mutant, ER+HER- Advanced or Metastatic Breast Cancer

Summary

This is a single arm, multicentric phase II study of milademetan plus fulvestrant in patients with ER+, HER2- ABC harboring GATA3 mutation(s) in the tumor and/or in ctDNA who have progressed on or after prior treatments including a CDK4/6 inhibitor. Frameshift or truncating GATA3 mutations will be identified by next generation sequencing (NGS) performed on either tissue or circulating DNA. Given the well-known safety profile of fulvestrant and the absence of significant toxicity expected from the association of fulvestrant and milademetan, a safety run-in is planned. During the course of the study, the Steering Committee will specifically review the occurrence of toxicities defined as DLTs in the safety run-in.

Timeline

Start

2023-10-12

Primary completion

2023-11-24

Completion

2023-11-30

Drugs

Indications