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Gleason scores in categorical order
| Gleason 6 | The tumor tissue is well differentiated, less aggressive, and likely to grow more slowly |
| Gleason 7 | The tumor tissue is moderately differentiated, moderately aggressive, and likely to grow but may not spread quickly |
| Gleason 8–10 | The tumor tissue is poorly differentiated or undifferentiated highly aggressive and likely to grow faster and spread |
