Figure 2.

PD-1 and PD-L1 expression in the colonic mucosa of patients with ulcerative colitis according to the maximal disease extent. (A) The levels of PD-1 did not significantly differ on the basis of the maximal disease extent. (B) When compared the maximal disease extent, the PD-L1 levels were highest in patients with proctitis (38.5 ± 46.7), followed by left-sided colitis (17.5 ± 23.1) and extensive colitis (5.2 ± 8.2) (p < 0.001). PD-1, programmed death 1; PD-L1, programmed death-ligand 1.