HLA-C and neoplasm: We evaluated the correlation between the expression levels of MHC-related genes and SUSD4 expression level in tumor cells and found that the expression levels of MHC-related genes were negatively correlated with SUSD4 expression level in LGG, MESO, BLCA, LUSC, ESCA, SARC, HNSC, BRCA, and KIRC (Figure 4D).