ERBB2 and cancer: Further analysis of grade 3 tumors according to subtype showed a significant correlation between RAD21 expression and shorter RFS in the grade 3 luminal (P = 0.040) (Figure 2D), grade 3 basal (P = 0.018) (Figure 2E) and grade 3 HER2 cancers (P = 0.039) (Figure 2F), but not null type cancers (P = 0.247).