ERBB2 and breast cancer: TNBC or HER2-positive breast cancer (BC) also showed poorer LMOS than luminal BC (TNBC, HR 3.58; 95% CI 1.20–10.64, p = 0.022; HER2-positive BC, HR 2.57; 95% CI 0.92–7.19; p = 0.073).