CD274 and Burkitt lymphoma: High PD-L1 expression is associated with a range of EBV-positive lymphomas, including post-transplant lymphoproliferative disorders (PTLD), diffuse large B-cell lymphoma (DLBCL), Burkitt lymphoma (BL), plasmablastic lymphoma (PBL), and natural-killer/T-cell lymphoma (NKTCL) [76,77,78,79,80].