Multi-institutional report of trastuzumab deruxtecan and stereotactic radiosurgery for HER2 positive and HER2-low breast cancer brain metastases.

ABSTRACT: Trastuzumab-deruxtecan (T-DXd) has demonstrated intracranial efficacy; however, safety and efficacy data remains limited with stereotactic radiosurgery (SRS). A multi-institutional review was performed with HER2+ or HER2-low metastatic breast cancer treated with T-DXd and SRS for active brain metastases. We identified 215 lesions treated over 48 SRS courses in 34 patients. Median follow up from T-DXd initiation was 13.9 months. The cumulative incidence of symptomatic radiation necrosis at 24 months per lesion was 2.1% and per patient 11%. The 12-month LC was 97%. HER2-low was associated with worse distant intracranial control (DIC) (adjusted HR 2.5, 95% CI 1.1-5.6, p = 0.03) and worse systemic progression free survival (PFS) (HR 4.1, 95% CI 1.6-10.7, p = 0.004). Concurrent SRS and T-DXd ha

SUBMITTER: Khatri VM 

PROVIDER: S-EPMC11582691 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature