ALK and mature T-cell and NK-cell non-Hodgkin lymphoma: Regarding the histology, 10 (50 %) patients had PTCL not otherwise specified (PTCL-NOS), 9 (45 %) patients had angioimmunoblastic T-cell lymphoma (AITL), and 1 (5 %) patient had anaplastic large cell lymphoma (ALCL) anaplastic lymphoma kinase (ALK) negative.