What is Cancer? Cancer is a group of diseases characterized by the uncontrolled growth and spread of abnormal cells. When the body's normal regulatory mechanisms fail, these abnormal cells divide rapidly, and form masses known as tumors. Not all tumors are cancerous; benign tumors do not spread to other parts of the body, whereas malignant tumors can invade nearby tissues and metastasize to distant organs. Types of Cancer Cancer can develop in almost any part of the body, resulting in over 100 different types. Here are some of the most common types: Carcinomas: These cancers begin in the skin or the tissues that line internal organs. Examples include breast, lung, and colon cancers. Sarcomas: These originate in the bones, muscles, cartilage, fat, or other connective tissues. Leukemias: These are cancers of the blood and bone marrow. Lymphomas: These affect the lymphatic system, which is part of the immune system. Central Nervous System Cancers: These occur in the brain and spinal c...
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