why cancer occur .......
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Cancer is a disease caused when cells divide uncontrollably and spread into surrounding tissues. Cancer is caused by changes to DNA. Most cancer-causing DNA changes occur in sections of DNA called genes. ... In normal cells, tumor suppressor genes prevent cancer by slowing or stopping cell growth.Feb 9, 2015
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Cancer is caused by changes to DNA. Most cancer-causing DNA changes occur in sections of DNA called genes. ... In normal cells, tumor suppressor genes prevent cancer by slowing or stopping cell growth.Cancer is a genetic disease—that is, it is caused by changes to genes that control the way our cells function, especially how they grow and divide.
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. (Our Cancer Causes and Prevention section has more information.)