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The uncontrolled growth of abnormal cells in the body. 90-95% of cancer cases can be attributed to environmental factors and 5-10% due to genetics. Environmental factors can include: tobacco (25-30% of cancer deaths), diet and obesity (30-35% of cancer deaths), infections (15-20% of cancer deaths), radiation (up to 10% of cancer deaths), stress, lack of physical activity, and environmental pollutants.