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Clonal hematopoiesis are not associated with an increased systemic inflammation, ATHerosclerosis nor incidence of atherothrombosis: Results from the 3-city study (CHIP-3C)
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International audience. Background and Aims : Clonal hematopoiesis of indeterminate Potential (CHIP) is defined by the detection of leukemia-associated mutations in the absence of hematological malignancy. This condition is associated with an increased mortality mainly driven by athero-thrombotic complications. Previous studies in mouse models demonstrated that CHIP increase atherosclerosis development. However the association between CHIP, atherosclerosis and athero-thrombosis remains poorly evaluated in patients. Methods: The 3-city study is a population-based longitudinal study that enrolled individuals aged ≥65 years. In this cohort, we selected 322 persons who had no cardiovascular event before inclusion. Eighty five of them suffered from a myocardial infarction or stroke during the 12-year follow-up. We searched for CHIP by a targeted NGS strategy on DNA collected at inclusion. Anthropomorphic, cardiovascular (risk factors, diet, atherosclerosis) and biological (CRP level) data at inclusion as well as incidence of athero-thrombotic events were compared between patients with or without CHIP. Results: A CHIP was detected in 41% of patients. As described, most patients presented mutations in DNMT3A (46%) and TET2 (30%). Patients with CHIP were slightly older than patients without CHIP (74.2 years VS 73 years, p=0.03). Neither the cardiovascular risk profile, nor the CRP levels (1.66 VS 1.75), nor the number of atheromatous plaques nor the intima-media thickness (0.67 VS 0.68) were different between patients with and without CHIP. The incidence of athero-thrombotic complications (myocardial infarction or stroke) was similar between patients with a CHIP and patients without. Conclusions: In conclusion, CHIP, in particular involving DNMT3A mutations, are not strongly associated with systemic inflammation, atherosclerosis or athero-thrombotic events.
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