HLA-DRB5 and neoplasm: Other proteins, including HLA-A, HLA-DMA, HLA-DQA1, HLA-DQB1, HLA-DRA, HLA-DRB1, and HLA-DRB5, were not reported on tumor–host immunological interactions, which indicated the proteins need further studies to testify them as novel OC biomarkers for tumor immunology.