The results suggested that high HLA-DPB2 and HLA-DPB1 expression levels were associated with better OS (HLA-DPB2, Figures 4A,B, P < 0.05; HLA-DPB1, Figures 4D,E and Supplementary Figures 3A1,A2, P < 0.05) in patients with BC. This evidence concerns the gene HLA-DPB1 and breast cancer.