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Aims Patients with diabetes (DM) and metabolic syndrome (MS) have elevated risks for atherosclerotic cardiovascular disease (ASCVD). Aggressive LDL-C lowering reduces risks. Inclisiran, a new siRNA, lowers LDL-C and was evaluated in patients with Type 2 diabetes (DM), metabolic syndrome (MS) without DM or neither (N) in the ORION-10 trial. Methods ORION-10 was a double-blind, randomized, placebo controlled trial evaluating inclisiran in 1561 patients with ASCVD on maximally tolerated therapy for lowering LDL-C. 781 inclisiran (INC) participants and 780 placebo (P) patients received 1.5 mL SQ tx at Days 1, 90, then every 6 months until Day 540. We evaluated the time adjusted change in LDL-C from baseline after Days 90–540 in DM (n = 702), MS (n = 455) and N participants (n = 404). Results There were no differences in baseline demographics and background therapies between INC and P. Statins were utilized in 89.8% INC and 88.7% of P. High intensity statins were utilized in 67.2% of INC and 68.8% of P; ezetimibe in 10.2% of NC and 9.5% of P participants. INC reduced LDL-C by − 54.4% (−58.3, −50.6 95% CI) in DM, (P Conclusions Inclisiran potently and durably reduces LDL-C across patients with DM, MS and those with neither, demonstrating potent efficacy and durability across glycaemic categories. Inclisiran may also represent a potent LDL-C lowering treatment for those with DM and MS.