Body mass index and risk of colorectal carcinoma subtypes classified by tumor differentiation status

European Journal of Epidemiology
Akiko HanyudaReiko Nishihara

Abstract

Previous studies suggest that abnormal energy balance status may dysregulate intestinal epithelial homeostasis and promote colorectal carcinogenesis, yet little is known about how host energy balance and obesity influence enterocyte differentiation during carcinogenesis. We hypothesized that the association between high body mass index (BMI) and colorectal carcinoma incidence might differ according to tumor histopathologic differentiation status. Using databases of the Nurses' Health Study and Health Professionals Follow-up Study, and duplication-method Cox proportional hazards models, we prospectively examined an association between BMI and the incidence of colorectal carcinoma subtypes classified by differentiation features. 120,813 participants were followed for 26 or 32 years and 1528 rectal and colon cancer cases with available tumor pathological data were documented. The association between BMI and colorectal cancer risk significantly differed depending on the presence or absence of poorly-differentiated foci (Pheterogeneity = 0.006). Higher BMI was associated with a higher risk of colorectal carcinoma without poorly-differentiated foci (≥30.0 vs. 18.5-22.4 kg/m2: multivariable-adjusted hazard ratio, 1.87; 95% confidence ...Continue Reading

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Apr 12, 2019·Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine·Demétrius Eduardo GerminiJaques Waisberg
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