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There is consensus that the Gleason system should be used for grading of prostate cancer. However, a number of controversial issues remain as regards how this grading is applied. A questionnaire was sent to 91 genitourinary pathologists in countries around the world with the purpose to survey current practice of Gleason grading. The response rate was 74%, including 43 North American pathologists and...
The Gleason score (GS) of prostate cancer is calculated by adding primary and secondary Gleason grades with patterns occupying less than 5% of the tumour often not included despite their probable prognostic significance. A modified Gleason score (mGS) comprising primary and tertiary patterns of higher grade has been proposed, but its interobserver variability has yet to be elucidated. Slides from...
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