Interestingly, comparing the PGK1 expression level between tumor and normal tissues according to different immune cell subtypes, the results showed that, with regard to the M1 macrophages and the activated NK cells—known as immunoactived cells—PGK1 presented a higher expression in the tumor than normal tissues, which may be related to more intricate regulatory mechanisms that might exist (Figure S7A–E). This evidence concerns the gene PGK1 and neoplasm.