ERBB2 and cancer: In comparing the raw TILs percentage (a continuous variable) among different molecular subtypes of cancer, it was found that TILs in TNBC and HER2+ breast cancer were significantly higher than that in HR+HER2− breast cancer (Z = 4.794; P < 0.001 and Z = 4.068; P < 0.001, respectively, Fig. 1).