Background: Humoral mediators of inflammation, in particular the complement system, have been described to play an important role in atherogenesis. Previously, we found a single-nucleotide polymorphism (SNP) in the complement 5 gene (C5 rs17611, A>G) independently associated with stroke. Up to now, the impact of C5 rs17611 on the progression of atherosclerosis and cardiovascular outcome in patients with asymptomatic atherosclerosis was unclear.

Materials And Methods: We investigated C5 rs17611 in a cohort of 1065 consecutive patients with asymptomatic carotid atherosclerosis. All patients were prospectively followed for the progression of carotid atherosclerosis and the development of a first major cardiovascular event (MACE), respectively.

Results: Three hundred and thirty-seven patients (31·6%) experienced a MACE during a median follow-up of 3·0 years. The homozygous GG genotype of the C5 rs17611 was significantly associated with adverse cardiovascular outcome (adjusted HR: 1·36 [95% CI, 1·07-1·73]; P = 0·01). After stratification for sex, C5 rs17611 CC was found to be an independent risk factor for MACE in men (HR 1·50 [95% CI, 1·12-1·83]). No association of C5 rs17611 with progression of carotid stenosis, observed in 93 (8·7%) patients, was detectable. Performance of ELISA indicated a significant association of the C5 rs17611 variant with C5a plasma levels.

Conclusion: The C5 rs17611 GG genotype is associated with increased C5a plasma levels and represents a risk factor for adverse cardiovascular outcome in male patients with carotid atherosclerosis.

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