Peripheral T-Cell Lymphomas: Incorporating New Developments in Diagnostics, Prognostication, and Treatment Into Clinical Practice-PART 2: ENKTL, EATL, Indolent T-Cell LDP of the GI Tract, ATLL, and Hepatosplenic T-Cell Lymphoma.

The World Health Organization classification for peripheral T-cell lymphomas (PTCLs) continues to evolve based on genetic and clinical distinctions of each entity. In Part 1, an overview was provided of PTCL not otherwise specified, follicular T-cell lymphoma, angioimmunoblastic T-cell lymphoma, anaplastic large cell lymphoma (ALCL), and breast implant-associated ALCL. In Part 2, this review is extended to extranodal natural killer (NK)/T-cell lymphoma, enteropathy-associated T-cell lymphoma, indolent T-cell lymphoproliferative disorder of the gastrointestinal tract, adult T-cell leukemia/lymphoma, and hepatosplenic T-cell lymphoma. Each NK/T-cell malignancy has its own signature, requiring knowledge of the appropriate diagnostic, prognostic, and therapeutic considerations when caring for afflicted individuals. Future directions will depend on discoveries that further our understanding of each disease and clinical trials that test the latest treatment options.