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Cancer Cancer is defined as the abnormal, uncontrolled growth of cells, which if left untreated can ultimately cause death. Benign versus Malignant Cancer Benign cancer or tumors are made up of cell similar to the surrounding cells and are surrounded or enclosed in a membrane that prevents them from penetrating neighboring tissues. They are only dangerous if their physical presence interferes with body functions; for example if the tumor blocks the flow of urine from the kidneys or blocks the flow of blood to a portion of the brain. Malignant (or Neoplasm) cancer or tumor is capable of invading the surrounding tissues including blood vessels, lymphatic system, and nerves. It can also spread to distant sites via through the blood and lymphatic systems, thereby producing invasive cancers in almost any part of the body. When cancer spreads to other parts of the body, this is called metastasis. Note: Cancers such as leukemia do not produce a mass and therefore not often called tumors. Common Cancers
The Causes of Cancer The exact cause of caner is unknown but scientist have enough evidence that the following might be associated with cancer
Preventing Cancer
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