Leukemias are also considered malignant growths. Cancer cells originate from genetic changes in a single cell, which then multiplies to form a clone of malignant cells. Cancerous growth is not controlled or regulated by the normal biochemical and physical forces present in the body. The abnormally growing cells do not develop into normal cells similar to the one from which the clone arose.
Cancer cells are able to grow in parts of the body other than their site of origin.
The process by which normal cells develop into cancer cells is called malignant transformation. In the last 40 years in the U.S., the cancer death rate has declined in women and increased in men. If any one of these signs is observed, it should be brought to a physician's attention without delay. Etiology Unregulated, disorganized proliferation of cell growth may be stimulated by various chemicals, viruses, and physical agents such as ionizing radiation and ultraviolet light. Ironically, cytotoxic agents used to treat cancer may cause it.