Recent studies have shown that follicular helper T-cell lymphoma of angioimmunoblastic type (AITL), the most common nodal peripheral T-cell lymphoma (PTCL), frequently arises in a background of clonal haematopoiesis (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, not otherwise specified 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.
Keywords: angioimmunoblastic T-cell lymphoma; clonal haematopoiesis; cytotoxic T-cell lymphoma; lymphoproliferative disorders; peripheral T-cell lymphoma.
© 2024 The Authors. British Journal of Haematology published by British Society for Haematology and John Wiley & Sons Ltd.