Expression of PD-L1 in tumor cells has been reported in some types of lymphomas such as extranodal NK/T cell lymphoma (ENKTL) [61–63], but not in certain types such as Burkitt lymphoma, nodular lymphocyte-predominant Hodgkin lymphoma, and HHV8-associated Kaposi’s sarcoma [64]. This evidence concerns the gene CD274 and Kaposi's sarcoma.