Targeting the Progesterone Receptor in Breast Cancer: Mind the Short Form!

Ronchi, Carlos; Brisken, Cathrin · Clin Cancer Res · 2023

editorial · Level V

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Abstract

The presurgical window of opportunity trial (WOT) MIPRA provides evidence that neoadjuvant treatment with the progesterone receptor (PR) antagonist mifepristone (RU486) may benefit patients with estrogen receptor-positive (ER+) breast cancer characterized by a high ratio of PR-A versus PR-B isoform (>1.5), suggesting that PR may be targeted in a subset of patients. See related article by Elía et al., p. 866.

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