ERBB2 and breast cancer: Two subgroups, a high-risk group and a low-risk group, can be stratified by nine FRGs, namely SQLE, G6PD, ALDH3A2, SLC1A4, CHAC1, SIAH2, FLT3, EGLN2, and SFXN5, which are associated with histological type, grade, stage, Her-2 status, and subtype of breast cancer.