The three leading cancer-related deaths in the global population are due to lung (17.8%), stomach (10.4%), and liver (8.8%). The industrialized countries account for the highest rates while the lowest rates tend to be in the northern Africa and southern and eastern Asia. Worldwide cancer rates are expected to increase in the near term because of aging populations and unhealthy lifestyles such as smoking and probably obesity. Tobacco use alone is responsible for 10 million deaths per year and is estimated to double by 2020. Althught cancer rates (usually expressed as number per 100,000 population) in the US have declined somewhat, there has been an increase in lung cance3r amoung wormen and general rise in liver cancer.
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