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What is cancer? The general question asked. Cancer is a disease in which certain cells in the body start growing uncontrolledly and spread to other parts of the body. Cancer can start from almost anywhere in the human body, which is made up of trillions of cells. Normally, human cells grow and reproduce through a process called cell division in order to create new cells when the body needs them. When cells are aging or have become damaged, they die, and new cells take their place. Sometimes, this orderly process breaks down, and the invalid or damaged cells grow and multiply. These cells can form tumors, which are the lumps of tissues. The tumor may be malignant or non- cancerous i.e. benign tumor.