ERBB2 and breast cancer: The TNBC subgroup showed a significant decrease in OAS and DFS compared to the HR+/Her2- [OAS, HR = 0.42; P < 0.001; DFS, HR = 0.53; P < 0.001] and HR+/Her2+ breast cancer subtypes [OAS, HR = 0.48; P < 0.001; DFS, HR = 0.59; P < 0.001].