ERBB2 and breast cancer: High-quality studies (NOS score > 6) were used to carry out the sensitivity analysis, and the results were consistent (breast cancer with the HER2-enriched molecular subtype: HR = 0.946, 95% CI [0.913 ~ 0.980], p = 0.002; TNBC molecular subtype: HR = 0.893, 95% CI [0.867 ~ 0.921], p < 0.001; breast cancer with the luminal molecular subtype: HR = 0.998, 95% CI [0.977 ~ 1.019], p = 0.840).