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The cancer can grow outside the prostate gland and spread to nearby tissues in the pelvis. This is called local spread.
Later, cells can break away from the main cancer and get into the lymphatic system or bloodstream. They can then travel to other areas of the body and start growing there. These cancers are called secondary cancers or metastases.
If prostate cancer spreads, it is usually to the bones. It may also spread to the liver, lungs or brain, but this is very uncommon.