CD4 and extranodal nasal NK/T cell lymphoma: Primary nodal NKTCL have the same phenotypic and genotypic characteristics asextranodal NKTCL, at least for the markers that are frequently tested, mostof them being described as being CD2+, sCD3-,cytCD3epsilon+, CD56+, EBV+ and ashaving the TCR genes in germ-line configuration; moreover, they also usuallyhave a CD4-, CD5-, CD7-, cytotoxicmolecules+ phenotype [48,49,52].