Origin of two distinct PTCL from CH.. Clonal hematopoiesis: a common progenitor for cytotoxic peripheral T-cell lymphoma and angioimmunoblastic T-cell lymphoma

Recent studies have shown that follicular helper T-cell lymphoma, angioimmunoblastic type (AITL), the most common nodal peripheral T-cell lymphoma (PTCL), frequently arises in a background of clonal hematopoiesis (CH), a preneoplastic condition affecting up to 40 % of elderly individuals. Data on a potential CH association are limited for other PTCL. We report a unique patient who sequentially developed both cytotoxic PTCL, NOS and AITL with distinct T-cell receptor rearrangements but shared somatic mutations originating from the same CH clone, thus providing convincing evidence that CH can give rise to T-cell neoplasms of different lineage.