Emerging patterns in clonal haematopoiesis

Abstract

Clonal haematopoiesis (CH) is defined by the presence of acquired mutations and/or cytogenetic abnormalities in haematopoietic cells. By definition, these premalignant clones do not meet criteria for haematopoietic neoplasms listed in the Revised Fourth Edition of the WHO classification. CH is fairly common in elderly individuals and is associated with higher risks for haematological cancers, in particular myelodysplastic syndrome and acute myeloid leukaemia (AML), as well as cardiovascular events. Similar small clones have also been detected during follow-up in patients with AML in morphological remission, in individuals with aplastic anaemia, and in pre-chemotherapy blood samples from patients with other types of cancers. In each of these contexts, the presence of mutations carries different clinical implications, and sometimes demonstrates unique genetic profiles. Emerging research suggests that the number and identity of mutations, the size of the mutant clones and various other factors, including age, immune status and history of exogenous drugs/toxins, are important for disease biology and progression. This review focuses specifically on the subset of CH with gene mutations detected by sequencing, and includes discussions of nomenclature and molecular technologies that detect and quantify gene mutations.

<p>Erdheim–Chester Disease and Acute Myeloid Leukemia with Mutated <em>NPM1</em> in a Patient with Clonal Hematopoiesis: A Case Report</p>

“…First, it is suggestive that a molecular relationship of ECD with clonal hematopoiesis could be present, therefore suggesting that the cell of origin might arises from a premalignant hematopoietic clone. 13 Although the cellular origin of ECD is not clear, previous studies have suggested that hematopoietic/myeloid progenitor cells might be the precursors of histiocytic neoplastic cells in both ECD and Langerhans cell histiocytosis (LCH). [6][7][8][9][10][11] Additionally, Papo et al 12 recently reported that 10% of adult patients with non-LCH had a concomitant myeloid neoplasm, mainly chronic myelomonocytic leukemia (CMML), myeloproliferative disorders and myelodysplastic syndromes (MDS).…”