BackgroundMyelodysplastic syndromes (MDS) and chronic myelomonocytic leukemia (CMML) are associated with cutaneous manifestations. Next-generation sequencing (NGS) is a tool capable of identifying clonal myeloid cells in the skin infiltrate and thus better characterize the link between hematological diseases and skin lesions.ObjectiveTo assess whether skin lesions of MDS/CMML are clonally related to blood or bone marrow cells using NGS.MethodsComparisons of blood or bone marrow and skin samples NGS findings from patients presenting with MDS/CMML and skin lesions in three French hospitals.ResultsAmong the 14 patients recruited, 12 patients (86%) had mutations in the skin lesions biopsied, 12 patients (86%) had a globally similar mutational profile between blood/bone marrow and skin, and 10 patients (71%) had mutations with a high variant allele frequency (>10%) found in the myeloid skin infiltrate. Mutations in TET2 and DNMT3A, both in four patients, were the most frequent. Two patients harbored a UBA1 mutation on hematopoietic samples.LimitationsLimited number of patients and retrospective collection of the data. Blood and skin sampling were not performed at the exact same time point for two patients.ConclusionSkin lesions in the setting of MDS/CMML are characterized by a clonal myeloid infiltrate in most cases.

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Chronic myelomonocytic leukaemia associated with large-and medium-sized arteries vasculitis of the small bowel Rheumatology key message . Myelodysplastic syndromes associated vasculitis can be lethal and require early treatment of the haematological neoplasm.

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