Dietary folate intake and k-ras mutations in sporadic colon and rectal cancer in The Netherlands Cohort Study.
Int J Cancer
; 114(5): 824-30, 2005 May 01.
Article
em En
| MEDLINE
| ID: mdl-15609319
ABSTRACT
We studied the association between dietary folate and specific K-ras mutations in colon and rectal cancer in The Netherlands Cohort Study on diet and cancer. After 7.3 years of follow-up, 448 colon and 160 rectal cancer patients and 3,048 sub-cohort members (55-69 years at baseline) were available for data analyses. Mutation analysis of the K-ras gene was carried out on all archival adenocarcinoma specimens. Case-cohort analyses were used to compute adjusted incidence rate ratios (RR) and 95% confidence intervals (CI) for colon and rectal cancer overall and for K-ras mutation status subgroups according to 100 mug/day increased intake in dietary folate. Dietary folate intake was not significantly associated with colon cancer risk for men or women, neither overall nor with K-ras mutation status. For rectal cancer, folate intake was associated with a decreased disease risk in men and was most pronounced for K-ras mutated tumors, whereas an increased association was observed for women. Regarding the K-ras mutation status in women, an increased association was observed for both wild-type and mutated K-ras tumors. Specifically, folate intake was associated with an increased risk of G>T and G>C transversions in rectal tumors (RR = 2.69, 95% CI = 1.43-5.09), but inversely associated with G>A transitions (RR = 0.08, 95% CI = 0.01-0.53). Our data suggest that the effect of folate on rectal cancer risk is different for men and women and depends on the K-ras mutation status of the tumor.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias Retais
/
Genes ras
/
Neoplasias do Colo
/
Dieta
/
Ácido Fólico
/
Mutação
Tipo de estudo:
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Risk_factors_studies
Limite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
País/Região como assunto:
Europa
Idioma:
En
Revista:
Int J Cancer
Ano de publicação:
2005
Tipo de documento:
Article