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| Code | Description |
|---|---|
| 1 | G1: Well differentiated |
| 2 | G2: Moderately differentiated: includes adenoid cystic carcinoma without basaloid (solid) pattern |
| 3 | G3: Poorly differentiated: includes adenoid cystic carcinoma with basaloid (solid) pattern |
| 4 | G4: Undifferentiated |
| 9 | Grade cannot be assessed (GX); Unknown |
