To find out the underlying mechanisms of HLA-DPB2 in BC, we predicted the distribution of HLA-DPB2 using the IncLocator database and found that HLA-DPB2 was mainly distributed in the cytoplasm (Figure 5A), indicating that HLA-DPB2 regulates HLA-DPB1 expression more likely in the ceRNA manner. This evidence concerns the gene HLA-DPB2 and breast cancer.