PTCLs consist mainly of 8 subtypes, including peripheral T-cell lymphoma not otherwise specified (PTCL, NOS), angioimmunoblastic T-cell lymphoma (AITL), ALK-positive anaplastic large-cell lymphoma (ALCL), ALK-negative ALCL, enteropathy-associated T-cell lymphoma (EATL), monomorphic epitheliotropic intestinal T-cell lymphoma (MEITL, also referred as type EATL-II), nodal peripheral T-cell lymphoma with TFH phenotype (PTCL-TFH), and follicular T-cell lymphoma (FTCL), according to NCCN Clinical Practice Guidelines in Oncology: T-Cell Lymphomas Version 1.2020 T-Cell Lymphomas [3]. The gene discussed is ALK; the disease is mature T-cell and NK-cell non-Hodgkin lymphoma.