Abstract
HER2 IHC1+ or IHC2+ and in situ hybridization (ISH)-negative results are sometimes referred to as HER2-Low. SG is a novel antibody-drug conjugate composed of an anti–Trop-2 antibody coupled to SN-38 via a proprietary, hydrolyzable linker. SG is approved in mTNBC for the second line (2L) onwards. In the ASCENT study, SG had significant progression-free survival (PFS) and overall survival (OS) benefit vs chemotherapy of physician’s choice (TPC). This ASCENT post hoc subgroup analysis evaluates SG efficacy in HER2 IHC0 and HER2-Low mTNBC.
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