HLA-DRB1 and neoplasm: Cluster Fib_5 prominently expressed MHC-II genes (HLA-DQA1, HLA-DQA2, HLA-DQB1, HLA-DRB5, HLA-DRB1, HLA-DRA, HLA-DPA1, and HLA-DPB1), indicating their role as antigen-presenting cells with tumor-suppressing effects.