PDCD1LG2 and cancer: Shorter PFS was associated with high PD-L2 expression in both cancer cells (HR, 1.8; 95% CI, 1.3 to 2.6; P = .001; Fig 2A) and stromal cells (HR, 1.5; 95% CI, 1.1 to 2.2; P = .018; Fig 2B).