At our hospital there are no facilities for in-situ hybridization studies, so we do not know whether or not the cells of the extranodal NK/T cell lymphoma, nasal type, of our patient carried EBV encoded early RNA, but serological studies showed that our patient had IgG but not IgM, to EBV cuspid antigen, indicative of either past EBV infection, or of current latent infection. Here, CD40LG is linked to disease arising from reactivation of latent virus.