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(Stroke. 2004;35:2294.)
© 2004 American Heart Association, Inc.

Original Contributions

Polymorphisms in Genes Involved in Inflammatory and Angiogenic Pathways and the Risk of Hemorrhagic Presentation of Brain Arteriovenous Malformations

Ludmila Pawlikowska, PhD; Mary N. Tran, PhD; Achal S. Achrol, BS; Charles E. McCulloch, PhD; Connie Ha, BS; Denise L. Lind, PhD; Tomoki Hashimoto, MD; Jonathan Zaroff, MD; Michael T. Lawton, MD; Douglas A. Marchuk, PhD; Pui-Yan Kwok, MD PhD William L. Young, MD for the UCSF BAVM Study Project

From the Cardiovascular Research Institute (L.P., C.H., D.L.L., P.Y.K.), Departments of Anesthesia and Perioperative Care and Center for Cerebrovascular Research (M.N.T., A.A., T.H., W.L.), Departments of Epidemiology and Biostatistics (C.E.M.), Neurological Surgery (M.T.L.), and Medicine (J.Z.), University of California, San Francisco, Calif; and the Department of Genetics (D.A.M.), Duke University Medical Center, Durham, NC.

Correspondence to Dr William L. Young, UCSF, 1001 Potrero Avenue, Rm3C-38, San Francisco, CA 94110. E-mail ccr{at}anesthesia.ucsf.edu

Background and Purpose— Accurate estimates of intracranial hemorrhage (ICH) risk in patients harboring brain arteriovenous malformation (BAVM) are needed to evaluate interventional strategies and to help guide clinical management. Identification of genetic polymorphisms associated with ICH would facilitate risk stratification in BAVM patients.

Methods— We identified patients with BAVM and documented clinical presentation, demographic data, venous drainage pattern, and BAVM size. Patients were genotyped for 5 polymorphisms in 3 inflammatory cytokine genes, and 9 polymorphisms in 5 angiogenesis-related genes. Association of genotype with risk of hemorrhagic BAVM presentation was evaluated using logistic regression analysis.

Results— We genotyped 180 patients with BAVM (53% female, 57% white, mean age at diagnosis 35±17 years, 41% presenting with ICH). BAVM patients homozygous for the interleukin 6 (IL6)–174G allele had a greater risk of ICH presentation (OR, 2.62, P=0.003) than IL6–174C carriers. In a multivariate logistic regression model, IL6–174G>C genotype, small BAVM size, and exclusively deep venous drainage were independent predictors of ICH presentation. A similar univariate trend was noted for the TNF-308 GG genotype (P=0.055). The other polymorphisms genotyped were not associated with ICH.

Conclusions— A polymorphism in the inflammatory cytokine IL6, but not polymorphisms in angiogenesis-related genes, was associated with ICH presentation of BAVM. Further studies are needed to define the role of inflammatory cytokines in the pathogenesis of BAVM hemorrhage.

Key Words: cerebral hemorrhage • genetic epidemiology • vascular malformations

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