Of them, the most common histological subtypes were PTCL-NOS (n = 28 [31.5%]), ENKTL (n = 19 [21.3%]), anaplastic lymphoma kinase-negative anaplastic large cell lymphoma (ALCL ALK-, n = 13 [14.6%]) and anaplastic lymphoma kinase-positive anaplastic large cell lymphoma (ALCL ALK+, n = 7 [7.9%]). This evidence concerns the gene ALK and mature T-cell and NK-cell non-Hodgkin lymphoma.