Depends on type of: Cancer. Some cancers are monitored by imaging studies to detect recurrence. Some cancers produce chemicals that can be detected in blood and recurrence can be detected by blood tests, e.g., in prostate, colon, some ovarian cancers and cancers of endocrine organs. Leukemias are monitored by cell counts in blood. There are no good monitors for many others.
Answered 12/28/2013
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