What do prostate cancer grades mean?
The grade refers to the cancer's appearance and how quickly it's growing. Most pathologists grade prostate cancer according to the Gleason score, from 1 to 5 based on how the cancerous cells look compared to normal prostate cells. The higher the score, the more likely it is that the cancer will grow and spread rapidly.
Pathologists often identify the two most common patterns of cells in the tissue, assign a Gleason grade to each, and add the two grades. A combined Gleason score of 2-6 is a less aggressive cancer. Grade 7-10 is considered more aggressive.
From: Prostate Cancer Grading
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