Extranodal EBV-positive NKTCL mainly demonstrates a CD4- and CD8-negative, CD56-positive, and rarely a CD8-positive phenotype [1, 17]; nevertheless, skin invasion by CD4-positive extranodal NKTCL has been reported in an elderly patient [18]. The gene discussed is NCAM1; the disease is extranodal nasal NK/T cell lymphoma.