Objective: To replicate results from a previous genome-wide association study of European ancestry women, in which a positive association was found between uterine leiomyomata (UL) and rs4247357, a single-nucleotide polymorphism located near the fatty acid synthase (FASN) gene.
Design: Prospective cohort study.
Setting: Not applicable.
Patient(s): African-American women aged 23–50 years, who were premenopausal and had an intact uterus in 1997.
Intervention(s): None.
Main Outcome Measure(s): We genotyped rs4247357 among 2,301 incident UL cases and 3,005 controls from the Black Women's Health Study (1997-2011). Odds ratios (ORs) and 95% confidence intervals (CI) were estimated using logistic regression with control for age, geographic region of residence, and percent European ancestry using a panel of validated ancestry informative markers.
Result(s): Overall, rs4247357 was not associated with UL risk. Relative to the CC genotype, ORs were 1.04 (95% CI 0.92–1.19) for the AC genotype and 1.09 (95% CI 0.93–1.29) for the AA genotype. A positive association was found, however, among those with higher European ancestry (≥40%). Relative to the CC genotype, ORs were 2.03 (95% CI 1.12–3.69) for the AC genotype and 2.44 (95% CI 1.20– 4.96) for the AA genotype. Dietary fat intake also appeared to modify the FASN–UL association.
Conclusion(s): Although there was little overall association between rs4247357 and UL risk, a positive association was observed among women with ≥40% European ancestry. Direct sequencing of this genomic region might be warranted to determine whether rs4247357, or some other variant, is causally related to UL.
