Remission describes the state of a disease where, although the patient is not cured of the disease, the disease is no longer causing any symptoms and can no longer be detected in the patient. It is used most frequently to describe a cancer patient where the disease is no longer spreading through the body and no tumors or other obvious signs of the cancer can be detected. However, a terminal disease can still be in remission, and a disease in remission can still be possible when a patient has a fairly short time to live, for example no more than twelve months.

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