CD4 and T-cell non-Hodgkin lymphoma: In 2017, the developing concept that follicular helper derivation represents a unifying feature of a large group of nodal CD4+ T cell lymphomas was reflected by the creation of an umbrella term “nodal T cell lymphoma of T follicular helper (TFH) origin” to encompass angioimmunoblastic T cell lymphoma, follicular T cell lymphoma, and nodal PTCL with T follicular helper phenotype.