These efforts were successful in defining characteristic gene expression profiles for AITL, ALK+ ALCL, ATLL, and PTCL-NOS, identifying recurrent mutations and recognizing specific subtypes, which can now help to support correct diagnosis and classification of patients to distinct disease subgroups with different prognoses [46,59,60,62,63]. Here, ALK is linked to angioimmunoblastic T-cell lymphoma.