Neoplasms such as Burkitt's lymphomas or gastric carcinomas express only EBER and EBNA1 (type I latency), whereas some Hodgkin lymphomas, nasopharyngeal carcinomas (NPC) and NK/T lymphomas express EBER, EBNA1, LMP1 and LMP2 genes (type II latency). The gene discussed is PSMB9; the disease is nasopharyngeal carcinoma.