ABSTRACT
Cancer is a group of diseases characterized by uncontrolled growth and spread of abnormal cells. In the scienti¤c or medical community, the term malignant neoplasm (tumor) is often used in place of cancer. Malignant tumors develop most commonly in major organs, such as the lungs, liver, stomach, intestines, skin, breasts, or pancreas, but they may also develop in lips, tongue, testes, or ovaries. Cancer may also develop in the blood cell-forming tissues of the bone marrow (the leukemias) and in the lymphatic system or bones.
