HLA-C and central nervous system cancer: Given that the four genes used to construct the risk score are all genes related to the major histocompatibility complex (MHC), in order to deeply explore their potential mechanisms of action and related characteristics in the samples, subsequently, for the samples from the Cancer Genome Atlas (TCGA) and the Chinese Glioma Genome Atlas (CGGA), we employed the single-sample gene set enrichment analysis (ssGSEA) method to conduct a scoring analysis of the MHC-related gene sets.