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Gleason Score

Glossary

Gleason score

A system of grading prostate cancer tissue based on how it looks under a microscope. Gleason scores range from 2 to 10 and indicate how likely it is that a tumor will spread. A low Gleason score means the cancer tissue is similar to normal prostate tissue and the tumor is less likely to spread; a high Gleason score means the cancer tissue is very different from normal and the tumor is more likely to spread.

Last updated: 2014-02-26

Source: The National Cancer Institute's Dictionary of Cancer Terms (http://www.cancer.gov/dictionary)