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For example, if the primary tumor grade was 2 and the secondary tumor grade was 3 but some cells were found to be grade 4, the Gleason score would be 2+4=6. This is a slight change from the pre-2005 Gleason system where the second number was the secondary grade (i.e., the grade of the second-most common cell line pattern).
Of the many cancer-specific schemes, the Gleason system, [3] named after Donald Floyd Gleason, used to grade the adenocarcinoma cells in prostate cancer is the most famous. This system uses a grading score ranging from 2 to 10. Lower Gleason scores describe well-differentiated less aggressive tumors.
3. Another typical Gleason score might be 7 (3+ 4), where the primary pattern has a Gleason grade of 3 and the secondary pattern has a grade of 4. 4. Finally, the highest possible Gleason score is 10 (5 + 5), when the primary and secondary patterns both have the most disordered Gleason grades of 5.
A score of 7 (with Gleason scores 4 + 3, or Gleason scores 3 + 4, with the most prominent listed first) can be grade group 2 or 3; it is grade group 2 if the less severe Gleason score (3) covered more area; grade group 3 if the more severe Gleason score (4) covered more area. A score of 8 is grade group 4.
This page was last edited on 24 December 2014, at 18:42 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Donald F. Gleason (November 20, 1920 – December 28, 2008) was an American physician and pathologist, best known for devising the "Gleason score" which predicts the aggressiveness of prostate cancer in patients.
Of note, this system of describing tumors as "well-", "moderately-", and "poorly-" differentiated based on Gleason score of 2–4, 5–6, and 7–10, respectively, persists in SEER and other databases but is generally outdated. In recent years pathologists rarely assign a tumor a grade less than 3, particularly in biopsy tissue. [citation needed]
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