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A cell that degenerates into a tumor cell does usually not acquire all these properties at once, but its daughter cells are selected to build them. This process is called cellular evolution. A first step in the development of a tumor cell is usually a small change in the DNA, often a point mutation, which leads, among other things, to a genetic instability of the cell. The instability increases to a point where the cell loses whole chromosomes, or has double ones. Also, the DNA methylation pattern of the cell changes, activating and deactivating genes more or less at random. Cells that divide at a high rate, such as stem cells, show a higher risk of becoming tumor cells than those which divide less or not at all, for example neurons. If the initial tumor cell (or group of tumor cells) is not removed by the immune system, it will develop into cancer.

In medicine, cancer is a general term for any of a number of different diseases where some of the body's own cells divide in an uncontrolled manner. The resulting new cells can form a malignant tumor (a neoplasm) or propagate throughout the body.

Treatment of cancer typically involves surgery to remove tumors and nearby lymph nodes to which the cancer may have spread, combined with radiation therapy and/or chemotherapy. The latter two target cells in the body that are rapidly dividing. This includes the cancer cells but also certain healthy ones, which is the reason for the severe side effects of these treatments.

  • People Living With Cancer
    Patient information from the American Society of Clinical Oncology.
  • Conversations In Care
    Explores the challenges surrounding physician and patient communications in cancer.
  • The World Against Cancer
    A conduit source consisting primarily of multi-lingual search engines.
  • Romanian Cancer League
    Eastern European organization with aims of education, prevention, treatment, support and advocacy.
  • CancerFit
    Details the activities of a program at the Sedona Racquet Club in Arizona. Designed to help survivors maintain good physical, emotional and spiritual fitness.