Untreated estrogen-positive ERBB2 negative breast cancer patients (n = 686) were available from the GSE11121, GSE1456, GSE19615, GSE2034, GSE21653, GSE2990, GSE31519, GSE3494, GSE45255, GSE4922, GSE69031, and GSE7390 datasets, and the expression of all together 959 genes reached statistical significance in correlation to relapse-free survival (Supplemental Table 6). This evidence concerns the gene ERBB2 and breast cancer.