HDAC9 was also closely related to various immunological characteristics [including tumor-infiltrating lymphocytes (TILs) (S1A–S1F Fig), immunosuppressive cytokines (S2A–S2F Fig), immune-activating cytokines (S3A–S3F Fig), and major histocompatibility complex (MHC) molecules (S4A–S4F Fig), all figures were downloaded directly from the TISIDB.]. Here, HLA-C is linked to neoplasm.