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metastasis-free survival

(meh-TAS-tuh-sis ... ser-VY-vul)
The length of time from the start of treatment for cancer that a patient is still alive and the cancer has not spread to other parts of the body. In a clinical trial, measuring the metastasis-free survival is one way to see how well a new treatment works. Also called MFS.
Search NCI's Dictionary of Cancer Terms