PDCD1 and acute myeloid leukemia: The SNP rs3087243 in the 3’-UTR of CTLA4 (GG vs. AA+AG, p = 0.0441, OR = 2.32, and 95% CI = 1.03–5.24) and rs41386349 in the intron 4 of PDCD1 (GG vs. AA+AG, p = 0.0362, OR = 2.62, and 95% CI = 1.07–6.42) also conferred recessive effects to the risk for mortality of patients with AML.