BACKGROUND: We investigated the variation in cancer incidence in Gharbiah, Egypt to explore geographic differences in relation to demographic and environmental exposures. METHODS: Using data from the only population-based cancer registry of Gharbiah, we studied the 10 most common cancers in men and women over 4 years (1999-2002). Census data provided denominators and urban-rural definitions. Crude and adjusted incidence rates (IRs), incidence rate ratios (IRRs) and 95% confidence intervals (CIs) were estimated using Poisson regression. RESULTS: Incidence of all common cancers was higher among men than women and urban incidence was higher than rural incidence for all cancer sites. Among men and women urban-rural incidence difference was highest for prostate cancer (IRR=4.85, 95% CI=3.76, 6.26) and uterus (IRR=6.05, 95% CI=4.17, 8.78), respectively. Among men and women, El-Santa district had the highest urban-rural difference within districts for laryngeal cancer (IRR=29.45, 95% CI=10.63, 81.61) and uterine cancer (IRR=15.98, 95% CI=2.69, 95.10), respectively. El-Santa also showed the highest urban incidence among all eight districts for most cancer sites. CONCLUSIONS: Geographic differences of cancers in Gharbiah need in-depth investigation with respect to specific environmental factors that explain the geographic cancer in this region.
BACKGROUND: We investigated the variation in cancer incidence in Gharbiah, Egypt to explore geographic differences in relation to demographic and environmental exposures. METHODS: Using data from the only population-based cancer registry of Gharbiah, we studied the 10 most common cancers in men and women over 4 years (1999-2002). Census data provided denominators and urban-rural definitions. Crude and adjusted incidence rates (IRs), incidence rate ratios (IRRs) and 95% confidence intervals (CIs) were estimated using Poisson regression. RESULTS: Incidence of all common cancers was higher among men than women and urban incidence was higher than rural incidence for all cancer sites. Among men and women urban-rural incidence difference was highest for prostate cancer (IRR=4.85, 95% CI=3.76, 6.26) and uterus (IRR=6.05, 95% CI=4.17, 8.78), respectively. Among men and women, El-Santa district had the highest urban-rural difference within districts for laryngeal cancer (IRR=29.45, 95% CI=10.63, 81.61) and uterine cancer (IRR=15.98, 95% CI=2.69, 95.10), respectively. El-Santa also showed the highest urban incidence among all eight districts for most cancer sites. CONCLUSIONS: Geographic differences of cancers in Gharbiah need in-depth investigation with respect to specific environmental factors that explain the geographic cancer in this region.
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