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Obesity, type 2 diabetes and cancers of the digestive system.

Obesity and type 2 diabetes mellitus are increasingly recognized as important risk factors for cancer development and progression, including cancers of the digestive system. Indeed, epidemiologic evidence demonstrated that both conditions increase the risk of digestive system cancer incidence and mortality, although with sex-specific and ethnic variations for certain associations with specific types of cancers. While these associations were quite consistent, study design and quality differences, lack of uniform adjustment for confounding factors, heterogeneity and various biases require cautio