IDO1 and pancreatic adenocarcinoma: And in PAAD, the expression of SLC38A2 is positively correlated with ADORA2A, BTLA, CD160, CD244, CD274, CD96, CSF1R, CTLA4, HAVCR2, IDO1, IL10, KDR, KIR2DL3, LAG3, PDCD1, PDCD1LG2, PVRL2, TGFB1, TGFBR1 and TIGIT (Figure 5E).