ALK and anaplastic large cell lymphoma: The most common subtypes of T-cell lymphoma include extranodal NK/T-cell lymphoma (ENKTL), nodal T-follicular helper cell lymphoma, angioimmunoblastic-type (nTFHL-AI), peripheral T-cell lymphoma, not otherwise specified (PTCL, NOS), and ALK-positive/negative anaplastic large cell lymphoma (ALCL), together accounting for 80% of T-cell lymphomas [1].