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Glea·son grade | \ ˈglē-sᵊn- 
\
\Medical Definition of Gleason grade
1 : a grade given to each of the two most prevalent patterns of cancer cells in tissue obtained from biopsy of a prostate tumor that is based on a scale of 1 to 5 with 1 to 3 corresponding to well-differentiated cancer cells similar in appearance to normal cells in surrounding tissue and 4 to 5 corresponding to poorly differentiated cancer cells that look abnormal
2 : gleason score
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