NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,588 terms related to cancer and medicine.
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- time to progression
- listen (… pruh-GREH-shun)
- The length of time from the date of diagnosis or the start of treatment for a disease until the disease starts to get worse or spread to other parts of the body. In a clinical trial, measuring the time to progression is one way to see how well a new treatment works. Also called TTP.