PDCD1 and B-cell chronic lymphocytic leukemia: In the study by Grzywnowicz et al. (182), no associations between five SNPs of PDCD1 (PD-1.1, PD-1.3, PD-1.5, PD-1.9, and rs41386349C>T) and susceptibility to chronic lymphocytic leukemia (CLL) were found in the group of 114 patients and 150 controls (182).