A Gleason score is a method of grading prostate cancer cells on a scale of 2 to 10.
SOURCE
American Cancer Society. (2007). Cancer reference information. Detailed guide: Prostate cancer. How Is Prostate Cancer Diagnosed? Retrieved November 2, 2007 from http://www.cancer.org/docroot/CRI/content/CRI_2_4_3X_How_is_prostate_cancer_diagnosed_36.asp?rnav=cri.
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