Real-world efficacy and safety of trastuzumab deruxtecan versus trastuzumab emtansine and tucatinib as second-line and third-line treatments for HER2-positive metastatic breast cancer: two target trial emulation studies.

ABSTRACT:

Background

The management of HER2-positive metastatic breast cancer (HER2⁺ mBC) has rapidly evolved. We assessed the real-world efficacy and safety of trastuzumab deruxtecan (T-DXd) versus trastuzumab emtansine (T-DM1) and tucatinib by emulating two phase III trials.

Methods

We emulated two target trials using the French National Health Data System: T-DXd versus T-DM1 and T-DXd versus tucatinib, for second- and third-line HER2⁺ mBC treatment. We included patients from September 2020 to September 2023, and followed them until death or April 2024. We emulated treatment assignment randomization with inverse probability of treatment weighting. Efficacy outcomes included time to treatment discontinuation (TTD) and overall survival (OS). Safety outcomes inclu

SUBMITTER: Jourdain H 

PROVIDER: S-EPMC12451362 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature