Intakes of vitamins A, C, and E and use of multiple vitamin supplements and risk of colon cancer: a pooled analysis of prospective cohort studies.
Cancer Causes Control
; 21(11): 1745-57, 2010 Nov.
Article
em En
| MEDLINE
| ID: mdl-20820901
ABSTRACT
OBJECTIVE:
To evaluate the associations between intakes of vitamins A, C, and E and risk of colon cancer.METHODS:
Using the primary data from 13 cohort studies, we estimated study- and sex-specific relative risks (RR) with Cox proportional hazards models and subsequently pooled RRs using a random effects model.RESULTS:
Among 676,141 men and women, 5,454 colon cancer cases were identified (7-20 years of follow-up across studies). Vitamin A, C, and E intakes from food only were not associated with colon cancer risk. For intakes from food and supplements (total), the pooled multivariate RRs (95% CI) were 0.88 (0.76-1.02, >4,000 vs. ≤ 1,000 µg/day) for vitamin A, 0.81 (0.71-0.92, >600 vs. ≤ 100 mg/day) for vitamin C, and 0.78 (0.66-0.92, > 200 vs. ≤ 6 mg/day) for vitamin E. Adjustment for total folate intake attenuated these associations, but the inverse associations with vitamins C and E remained significant. Multivitamin use was significantly inversely associated with colon cancer risk (RR = 0.88, 95% CI 0.81-0.96).CONCLUSIONS:
Modest inverse associations with vitamin C and E intakes may be due to high correlations with folate intake, which had a similar inverse association with colon cancer. An inverse association with multivitamin use, a major source of folate and other vitamins, deserves further study.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Vitaminas
/
Neoplasias do Colo
Tipo de estudo:
Clinical_trials
/
Etiology_studies
/
Incidence_studies
/
Observational_studies
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Prognostic_studies
/
Risk_factors_studies
/
Systematic_reviews
País/Região como assunto:
America do norte
/
Europa
Idioma:
En
Revista:
Cancer Causes Control
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Estados Unidos