Epidemiology and Pathology of T- and NK-Cell Lymphomas.

PURPOSE: This review will describe and update readers on the recent changes in the 2017 WHO classification regarding peripheral T-cell lymphomas. RECENT FINDINGS: Signficant advances in molecular studies have resulted in revisions to the classification as well as introduction to provisional entities such as breast implant-associated ALCL and nodal PTCL with T-follicular helper phenotype. SUMMARY: Major advances in molecular and gene expression profiling has expanded our knowledge of these rare and aggressive diseases.