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Glycaemic index, glycaemic load and ovarian cancer risk: a prospective cohort study

  • Stephanie AN Silvera (a1), Meera Jain (a2), Geoffrey R Howe (a3), Anthony B Miller (a2) and Thomas E Rohan (a4)...
Abstract
AbstractBackground

There is some evidence that plasma insulin levels might influence ovarian cancer risk. Glyacemic index (GI) and glycaemic load (GL) are measures that allow the carbohydrate content of individual foods to be classified according to their postprandial glycaemic effects and hence their effects on circulating insulin levels. Therefore, we examined ovarian cancer risk in association with GI and GL, and intake of dietary carbohydrate and sugar.

Methods

The study was conducted in a prospective cohort of 49 613 Canadian women enrolled in the National Breast Screening Study (NBSS) who completed a self-administered food-frequency questionnaire (FFQ) between 1980 and 1985. Linkages to national mortality and cancer databases yielded data on deaths and cancer incidence, with follow-up ending between 1998 and 2000. Data from the FFQ were used to estimate overall GI and GL, and Cox proportional hazards models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for the association between energy-adjusted quartile levels of GL, overall GI, total carbohydrates, total sugar and ovarian cancer risk.

Results

During a mean 16.4 years of follow-up, we observed 264 incident ovarian cancer cases. GI and total carbohydrate and sugar intakes were not associated with ovarian cancer risk in the total cohort. GL was positively associated with a 72% increase in risk of ovarian cancer (HR = 1.72, 95% CI = 1.13–2.62, Ptrend = 0.01) and the magnitude of the association was slightly greater among postmenopausal (HR = 1.89, 95% CI = 0.98–3.65, Ptrend = 0.03) than among premenopausal women (HR = 1.64, 95% CI = 0.95–2.88, Ptrend = 0.07).

Conclusions

Our data suggest that consumption of diets with high GL values may be associated with increased risk of ovarian cancer.

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Copyright
Corresponding author
*Corresponding author: Email silveras@mail.montclair.edu
References
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