Phase Ib Trial of Fulvestrant, Palbociclib, and Erdafitinib, a pan-FGFR Tyrosine Kinase Inhibitor, in HR+/HER2- Metastatic Breast Cancer.

ABSTRACT:

Purpose

We report herein a phase Ib trial to determine the safety, tolerability, and antitumor activity of erdafitinib, a pan-FGFR tyrosine kinase inhibitor, with fulvestrant and palbociclib in patients with hormone receptor-positive/HER2-negative metastatic breast cancers (NCT03238196).

Patients and methods

Thirteen patients were enrolled on the escalation phase in a traditional 3 + 3 trial design to determine the maximum tolerated dose (MTD). Subsequently, 22 patients were treated at the established MTD during the expansion phase. All patients had received prior treatment with cyclin-dependent kinase-4/6 inhibitors and endocrine therapy, and 29 showed FGFR pathway alterations in their tumors.

Results

The MTD of erdafitinib was 6 mg taken orally once daily when combi

SUBMITTER: Gonzalez-Ericsson PI 

PROVIDER: S-EPMC12326521 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature