ESR1 and breast cancer: FOXC1 drives epithelial–mesenchymal transition and correlates with poor survival in breast cancer, PRR15 has recently been identified as a luminal‐subtype marker in hormone receptor–positive tumors [28], and PRKCQ suppresses ER\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{upgreek}\usepackage{mathrsfs}\setlength{\oddsidemargin}{-69pt}\begin{document}${\mathrm{\alpha }}$\end{document} expression and is required for mammary tumorigenesis in triple-negative models [29].