The study also included 11 peripheral T-cell lymphomas [7 cases of PTCL NOS and one case of hepatosplenic T-cell lymphoma, angioimunoblastic T-cell lymphoma, anaplastic large T-cell lymphoma (ALK-negative) and NK/T-cell nasal type lymphoma, respectively]. This evidence concerns the gene ALK and mature T-cell and NK-cell non-Hodgkin lymphoma.