ERBB2 and breast cancer: Considering that there are three major molecular subtypes of breast cancer, the mRNA levels of UBE2C in luminal‐like, HER2 positive, and TNBC were analyzed based on TCGA database (Figure S1B, Supporting Information).[2] The expression of UBE2C was significantly upregulated in all subtypes of breast cancer compared to normal breast tissue, and TNBC harbored the highest expression level of UBE2C among all subtypes.