The document describes a Gleason grade grouping system used to classify prostate cancer based on biopsy results. It assigns prostate cancers a grade from 1 to 5 based on their Gleason scores, with lower grades indicating less aggressive cancers and higher grades indicating more aggressive cancers likely to spread.

2. AJCC
6th Ed
2002

9. Gleason grade grouping
Group Grade
1 ≤ 6
2 3+4
3 4+3
4 8
5 9 or 10