ERBB2 and breast cancer: Further intrinsic subtype analysis presented that basal-like subtype had more fusions compared to other intrinsic subtypes in HR + HER2- BC (median number of fusions of basal like subtype in HR + HER2-BC: 17.5, IQR:9.75–18.75) (Fig. 2c) and TNBC (median number:10, IQR: 6 -15) (Fig. 2f) (p < 0.05, respectively).