ERBB2 and breast cancer: High CDK7 RNA levels correlated with worse RFS for all breast cancer patients (Figure 1A), with the strongest associations found in basal (p = 1.4 × 10−05, HR = 1.75) and HER2+ (p = 9.5 × 10−05, HR = 1.91) subgroups (Figure 1D–E).