Is switching to T-DM1 still justified in HER2-negative residual breast cancer after neoadjuvant systemic therapy?

Breast

Multidisciplinary Breast Clinic, Antwerp University Hospital, Drie Eikenstraat 655, 2650 Edegem, Belgium; Faculty of Medicine, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium.

Published: June 2025


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Article Abstract

The standard of care for HER2-positive and hormone receptor-positive breast cancer patients who receive neoadjuvant chemotherapy (NACT) combined with trastuzumab, with or without pertuzumab, is to continue with adjuvant T-DM1 in cases of an incomplete response according to KATHERINE trial results. However, the optimal management for patients with residual disease with loss of HER2 expression is not widely studied. Loss of HER2 expression after NACT with anti HER2 is a rarer event with questionable value both as a predictive prognostic marker.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12144929PMC
http://dx.doi.org/10.1016/j.breast.2025.103885DOI Listing

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