Using the Kaplan-Meier Plotter (https://kmplot.com/analysis/) [61] for breast cancer we observed that mRNA expression of NCOA3, GREB1 but not ATF2 and TFF1 correlated with progression-free survival (PFS) whereas NCOA3, GREB1 and TFF1 correlated with overall survival (OS) in ER-positive breast cancer patients systemically-treated with tamoxifen only (Supplementary Fig. 6). This evidence concerns the gene GREB1 and breast cancer.