While the expression of GR is decreased during breast cancer development (Perou et al, 2000; Sørlie et al, 2001; Lien et al, 2006; Conde et al, 2008; Buxant et al, 2010), studies have shown that GR activation by GCs can inhibit cell proliferation in estrogen receptor (ER)‐positive breast cancer (Tonsing‐Carter et al, 2019). This evidence concerns the gene NR3C1 and breast cancer.