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What is the main cause of cancer or tumor? Do we really know the causative agent for cancer?
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Genetic changes that cause cancer can be inherited from our parents. They can also arise during a person?s lifetime as a result of errors that occur as cells divide or because of damage to DNA caused by certain environmental exposures. Cancer-causing environmental exposures include substances, such as the chemicals in tobacco smoke, and radiation, such as ultraviolet rays from the sun.
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