PDCD1LG2 and neoplasm: Gal-9 expression on TILs was significantly correlated with CD4 on TILs (P = 0.025), CD8 on TILs (P = 0.001), FOXP3 on TILs (P = 0.022), OX40L on tumor cells (P = 0.03), OX40L on TILs (P = 0.00018), PD-1 on TILs (P = 0.002), PD-L1 on tumor cells (P = 0.026), and PD-L2 on tumor cells (P = 0.048) (Table S2).