Gleason score. Definition

Medical Definition: Gleason score

Usual method used in the study of prostate cancer cytohistological. The Gleason score assigned to each area 2 tumor grades based on primary and secondary patterns of glandular differentiation of the studied area. The Gleason score is obtained by scoring from 1 to 5 the two main histological characteristics of the sample and the extreme values ??is 2 (1 +1 = normal) to 10 (5 +5). A high Gleason index represents a bad prognosis of prostate cancer.

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