The co-occurrence of low PDCD1 expression and M1, but not M2 TAM levels in the NSD1 subtype led us to hypothesize that PD-1 expression may actually be associated with M1 TAM levels; therefore, we investigated the correlation of PD-1 expression with different TAM fractions inferred by CIBERSORT, across 28 TCGA cancer types. This evidence concerns the gene PDCD1 and cancer.