Am. J. Respir. Crit. Care Med., Volume 158, Number 5, November 1998, 1566-1570

Angiotensin-converting Enzyme Gene Polymorphism and Risk of Sarcoidosis

MARY J. MALIARIK, BENJAMIN A. RYBICKI, EMILY MALVITZ, ROBERTA G. SHEFFER, MARCIE MAJOR, JOHN POPOVICH Jr., and MICHAEL C. IANNUZZI

Division of Pulmonary and Critical Care Medicine and Department of Biostatistics and Research Epidemiology, Henry Ford Health System, Detroit, Michigan

The angiotensin-converting enzyme (ACE) has been implicated in the pathophysiology of sarcoidosis. Serum ACE levels in normal and sarcoidosis patients are influenced by an insertion (I)/deletion (D) polymorphism in the ACE gene. To elucidate the role of this ACE gene polymorphism in sarcoidosis, we conducted a case-control study in African Americans and Caucasians. The ACE gene (I/D) polymorphism did not differ between 60 Caucasian cases and 48 control subjects (p = 0.577). In contrast, a comparison of 183 African-American cases and 111 control subjects resulted in a marked difference in genotypic distributions (p = 0.005). In African Americans, the risk for sarcoidosis was 1.30 (95% confidence interval [CI] = 0.72 to 2.36) for ID heterozygotes, and 3.17 (95% CI = 1.50 to 6.71) for deletion/deletion (DD) homozygotes. The risk associated with the DD homozygotes was even greater in African Americans when cases were restricted to those with a positive family history (odds ratio = 4.83; 95% CI = 1.86 to 12.59). Further analyses of African-American cases showed that the ACE genotype was not associated with disease severity, extrathoracic involvement, or overall radiographic change 2 to 4 yr after diagnosis. We did find a moderate association between the II genotype and radiographic progression (OR = 2.97; 95% CI = 1.01 to 8.76). Our results suggest the ACE genotype may play a more important role in sarcoidosis susceptibility and progression in African Americans than Caucasians.

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