Twenty-four cases of T-cell lymphoma were identified: twenty-one cases of extranodal NK/T cell lymphoma, nasal type (ENKTCL); two cases of peripheral T-cell lymphoma (PTCL); and one case of anaplastic large cell lymphoma (ALCL) with positive ALK. The gene discussed is ALK; the disease is mature T-cell and NK-cell non-Hodgkin lymphoma.