Abstract

Triple-negative breast cancer (TNBC) is a heterogeneous disease with at least five molecular subtypes characterized by distinct gene expression, genomic and tumor microenvironment (TME) profiles. The phase III adjuvant IBCSG 22-00 trial evaluating low-dose cyclophosphamide and methotrexate (CM) chemotherapy did not show a clinical benefit in unselected TNBC patients. Here, we aimed to explore whether specific TNBC molecular subtypes and TME features could predict benefit to low-dose CM maintenance chemotherapy in the IBCSG 22-00 study.

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