Derived Grade
NAACCR Item
NAACCR #1975| Code | Description |
|---|---|
| 1 | WHO Grade I: Circumscribed tumors of low proliferative potential associated with the possibility of cure following resection |
| 2 | WHO Grade II: Infiltrative tumors with low proliferative potential with increased risk of recurrence |
| 3 | WHO Grade III: Tumors with histologic evidence of malignancy, including nuclear atypia and mitotic activity, associated with an aggressive clinical course |
| 4 | WHO Grade IV: Tumors that are cytologically malignant, mitotically active, and associated with rapid clinical progression and potential for dissemination |
| L | Stated as "low grade" NOS |
| H | Stated as "high grade" NOS |
| A | Well differentiated |
| B | Moderately differentiated |
| C | Poorly differentiated |
| D | Undifferentiated, anaplastic |
| 9 | Grade cannot be assessed (GX); Unknown |