ESR1 and breast cancer: A total of 6 ovarian genes (PTCH1, TGFBR2, CXCL14, POSTN, FAP, and NUAK1), 36 pancreas genes from the gene signature developed by Haider et al. 40, and 7 breast cancer gene modules (ESR1, ERBB2, STAT1, CASP3, PLAU, VEGF, and AURKA) were tested.