PDCD1 and cancer: As shown in Figure 4A, we found that FTL levels were positively related to PD-1 in 14/32 cancers (43.8%), PD-L1 in 10/32 (31.3%), CTLA4 in 13/32 (40.6%), TIM-3 in 26/32 (81.3%), LAG3 in 13/32 (40.6%), and LAIR1 in 26/32 (81.3%).