HLA-DPB2 and medullary breast carcinoma: The details were shown in Supplementary Figure 2; compared with normal breast tissues, the expression level of the pseudogene HLA-DPB2 significantly increased in invasive breast carcinoma (BRCA), invasive lobular breast carcinoma, and BRCA stroma (Supplementary Figures 2A–C, P < 0.0001), whereas mRNA expression of HLA-DPB1 obviously enhanced in BRCA, invasive ductal breast carcinoma, and medullary breast carcinoma (Supplementary Figures 2D–F, P < 0.0001).