GATA6 and breast cancer: Gata6 is overexpressed in a variety of cancers, including pancreato‐biliary cancers (Kwei et al, 2008), colon cancers (Shureiqi et al, 2007; Tsuji et al, 2014), esophageal adenocarcinomas (Lin et al, 2012), breast cancers (Song et al, 2015), and adrenal tumors (Vuorenoja et al, 2007).