NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,990 terms related to cancer and medicine.

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S-phase fraction
(... fayz FRAK-shun)
A measure of the percentage of cells in a tumor that are in the phase of the cell cycle during which DNA is synthesized. The S-phase fraction may be used with the proliferative index to give a more complete understanding of how fast a tumor is growing.