Cancer is uncontrolled growth of a group of cells which invade and destroy adjacent tissues, and can move to other parts of the body. The abnormal cells are called malignant cells, cancer cells or tumor cells. There are more than a hundred types of cancer and their classification is based on the type of cell that was attacked initially. Uncontrollable division of damaged cells harms the body when lumps or masses of tissues (tumors) are formed (Anand et al 2097). Tumors affect the normal systems of the body such as circulatory, digestive and nervous systems, and produces hormones which alter normal body function. Benign tumors are ones which demonstrate limited movement and growth. Malignant tumors are the most dangerous and they form when the following happens: cancer cells move across the body through the blood or lymph systems and destroy healthy tissue; and when a cell divides and forms blood vessels and feeds itself through a process known angiogenesis (Kuper et al 460)
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