RNF144A and breast cancer: To further analyze whether the alternation of methylation levels of RNF144A promoter is associated with different molecular subtypes of breast cancer, we compared the methylation levels of RNF144A promoter at the R1 and R2 regions in triple‐negative breast cancer (TNBC, n = 12) with those in non‐TNBC (n = 18) in our patient cohort.