PDCD1LG2 and diffuse large B-cell lymphoma: (26) have studied the expression of PD-L2 in 88 cases of DLBCL who received R-CHOP regimen using immunohistochemistry, with 5% as the cut-off value, and found that the TC PD-L2 positive rate was 68.4%, which was significantly higher than that in the present study.