Gleason score
[GLEE-sun] A system of grading prostate cancer cells based on how they look 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 cells are similar to normal prostate cells and are less likely to spread; a high Gleason score means the cancer cells are very different from normal and are more likely to spread. | ||||
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Gleason score Definition from Encyclopedia Dictionaries & Glossaries
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Gleason score
A Gleason score is given to prostate cancer based upon its microscopic appearance. The Gleason score is important because higher Gleason scores are associated with worse prognosis. This is because higher Gleason scores are given to cancer which is more aggressive. To assign a Gleason score, a piece of prostatic tissue must be obtained (a biopsy). This is done either by removing the gland (prostatectomy) or by sampling the gland with a needle introduced through the rectum.
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