About 70–90% of cancer is thought to be environmentally related, with about 40–60% attributed to lifestyle or dietary practices. About 10–30% is thought to be related to tobacco smoking. It is not possible to give a precise upper limit to the sum of attributable risks, which may be more than 100%, for the total cancer burden in a community. However, in many cases the degree to which a factor might contribute to the total cancer incidence can be estimated in the sense that if the factor is absent, the proportion of all related cancers would not occur. For example, tobacco smoking is responsible for about 85% of the lung cancer in most populations.
KeywordsGastric Cancer Endometrial Cancer Cancer Death Lithocholic Acid Cervix Uterus
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