For EBV-positive patients, COX analysis: age of onset, the gender of the patient, the type of lymphomas (B or T/NK), the IPI scores of lymphomas, and whether the initial treatment contained etoposide. The results showed the type of lymphoma (P = .011, ExpB = 0.113) and the IPI scores (p = .004, ExpB = 2.419) were associated with prognosis