Gleason Score

Gleason Pathologic Scoring System. A primary and secondary score are assigned ranging from “1,” which is well differentiated, to “5,” which is poorly differentiated. The Gleason sum (range 2–10) then can be used to evaluate prognosis. (From: Gleason DF. Histologic grading of clinical staging of prostatic carcinoma. In: Tannenbaum M, ed. itshape Urologic pathology: the prostate. Philadelphia: Lea & Febiger, 1977:171,