Interaction between vitamin E intake and a COMT gene variant on colorectal cancer risk among Korean adults: a case-control study
- Author:
Shinyoung JUN
1
;
Madhawa GUNATHILAKE
;
Jeonghee LEE
;
Jae Hwan OH
;
Hee Jin CHANG
;
Dae Kyung SOHN
;
Aesun SHIN
;
Jeongseon KIM
Author Information
- Publication Type:Original Article
- From:Epidemiology and Health 2023;45(1):e2023100-
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVES:Previous human trials have not supported the anticarcinogenic effect of vitamin E despite biological plausibility and considerable epidemiological evidence. A possible explanation for this inconsistency is the interactive effect of the catechol-O-methyltransferase (COMT) gene and supplemental vitamin E on cancer. We examined whether a COMT gene variant modulates the effect of dietary vitamin E intake on colorectal cancer (CRC) risk.
METHODS:In this case-control study of Korean adults (975 cases and 975 age- and sex-matched controls), dietary vitamin E density (mg/1,000 kcal) was measured using a semiquantitative food frequency questionnaire, COMT single nucleotide polymorphism (SNP) rs740603 (A>G) was genotyped, and CRC was verified histologically. We estimated odds ratios (ORs) and 95% confidence intervals (CIs) using unconditional logistic regression models with adjustments for potential confounders.
RESULTS:Higher vitamin E density was associated with a lower risk of CRC (highest vs. lowest quartiles: OR, 0.72; 95% CI, 0.55 to 0.96; p-for-trend=0.002). When stratified by COMT SNP rs740603 genotype, the inverse association between vitamin E density and CRC risk was confined to those with at least 1 A allele (≥median vs.
