PD-L1 expression in tumor cells was observed in 84.2% (16/19) of MCCHL cases, 100% (11/11) of NSCHL cases, 66.6% (4/6) of LDCHL cases, and 66.6% (2/3) of LRCHL cases. The gene discussed is CD274; the disease is Hodgkin's lymphoma, mixed cellularity.