Despite the OlympiA trial demonstrating that early-stage, high-risk, HER2- germline BRCA1 and BRCA2 mutation (gBRCAm) positive breast cancer patients can benefit from PARPi in the adjuvant setting, the gBRCA testing rate in early-stage HR+/HER2− patients remains suboptimal compared to that in early-stage TNBC patients. This evidence concerns the gene ERBB2 and breast cancer.