PDCD1 and cancer: FTH1 levels (Figure 4B) were positively related to PD-1 in 4/32 (12.5%) cancers, PD-L1 in 9/32 (28.1%), CTLA4 in 7/32 (21.9%), TIM-3 in 20/32 (62.5%), LAG3 in 2/32 (6.3%), and LAIR1 in 19/32 (59.4%).