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Cancer.
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| Submitted: Mon Oct 20 2003
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CANCER: A cancer is an uncontrolled proliferation of cells. * In some the rate is fast; in others, slow; but in all cancers the cells never stop dividing. * This distinguishes cancers - malign tumours - from benign growths like moles where their cells eventually stop dividing. * Cancers are clones. No matter how many trillions of cells are present in the cancer, they are all descended from a single ancestral cell. * Cancers begin as a primary tumour. At some point, however, cells break away from the primary tumour and - travelling in blood and lymph - establish metastases in other locations of the body. Metastasis is what usually kills the patient. * Cancer cells contain mutated genes known as oncogenes. The mutations are found in genes that are involved in mitosis; that is, in genes that control the cell cycle. WHAT PROBABLY HAPPEN IS: * A single cell in a...
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