CD274 and post-transplant lymphoproliferative disease: We clearly found that the degree of PD‐L1 expression inversely correlated with that of PD1 expression in surrounding tissues of all PTLD categories, with the highest PD‐L1 expression in DLBCL [9 of 11 (82%) vs PD1 expression in 1 of 11 (9%) cases] and in p‐PTLD [6 of 7 (86%) vs PD1 expression in 2 of 7 (29%) cases], and the lowest expression in non‐destructive lesions [1 of 8 (12.5%) vs PD1 expression in 6 of 8 (75%) cases].