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Cancer is the name given to a group of related diseases characterized by the uncontrolled and excessive growth of abnormal cells. More than 200 different types of cancer have been identified. When these extra cells form a mass or a solid lump of tissue, it is called a tumor. Most cancers form tumors, but not all do. Tumors may be either benign or cancerous. Benign tumors do not spread to other parts of the body and are rarely life-threatening. Many breast lumps, for example, are benign. Benign tumors are not cancer. Malignant tumors crowd out healthy cells, interfere with body functions, and draw nutrients from body tissues. Malignant tumors can also spread to other parts of the body via the blood or lymphatic system, forming satellite tumors, called secondary cancers or metastases. Malignant tumors are cancer.
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