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In cancer, there is also talk of cell division. This division does not take place because it is needed. In cancer cells start to divide adderum unnecessarily. The cells that result also have a different shape, and may not function properly. By extension of the number of cancer cells results in a plurality of these abnormal cells. These form a malignant tumor. The cells of such a tumor to proliferate indefinitely through and penetrate the surrounding tissue within. There targeting the tumor often damage. If the tumor grows it can exert pressure on the surrounding tissue. Cancer can also occur in certain blood cells in the bone marrow, or the lymphatic system. An example of cancers of blood cells is leukemia; example of a cancer of the lymphatic system is Hodgkin's disease. In these diseases, cancer cells interfere with the operation of the blood and / or the lymph (tissue fluid).