Cigarette smoking and colorectal cancer risk by KRAS mutation status among older women.

The American Journal of Gastroenterology
N J SamadderPaul J Limburg

Abstract

Existing data support a modest association between cigarette smoking and incident colorectal cancer (CRC) overall. In this study, we evaluated associations between cigarette smoking and CRC risk stratified by KRAS mutation status, using data and tissue resources from the Iowa Women's Health Study (IWHS). The IWHS is a population-based cohort study of cancer incidence among 41,836 randomly selected Iowa women, ages 55-69 years of age at enrollment (1986). Exposure data, including cigarette smoking, were obtained by self-report at baseline. Incident CRCs (n=1,233) were ascertained by annual linkage with the Iowa Cancer Registry. Archived tissue specimens from CRC cases recorded through 2002 were recently requested for molecular epidemiology investigations. Tumor KRAS mutation status was determined by direct sequencing of exon 2, with informative results in 507/555 (91%) available CRC cases (342 mutation negative and 165 mutation positive). Multivariate Cox regression models were fit to estimate relative risks (RRs) and 95% confidence intervals (CIs) for associations between cigarette smoking variables and KRAS-defined CRC subtypes. Multiple smoking variables were associated with increased risk for KRAS mutation-negative tumors, i...Continue Reading

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