The Long and Winding Road for Breast Cancer Biomarkers to Reach Clinical Utility.

Hunter, Natasha B; Kilgore, Mark R; Davidson, Nancy E · Clin Cancer Res · 2020

editorial · Level V

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Abstract

Tumor data from the ABCSG 5 trial of chemotherapy versus endocrine therapy for premenopausal ER<sup>+</sup> breast cancer supports molecular subtyping by Ki-67 IHC as a prognostic marker. But while this tissue was handled uniformly, Ki-67 testing overall is unstandardized, complicating clinical utility. Increasing potential biomarkers herald more challenges in biomarker validation.<i>See related article by Bago-Horvath et al., p. 5682</i>.

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