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It is a disease that starts in the cells of the prostate gland.
Cancer occurs when normal body cells get out of control, multiply and spread. These cells clump together to form a cancerous or malignant tumour which can then grow and damage healthy parts of the body.
Some cancers grow quickly and cause problems, but prostate cancer usually grows slowly, especially in older patients. It may be a long time before it leads to troublesome symptoms or needs treatment. Some men are never aware that they have prostate cancer.