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NIH-Fletcher criteria for GIST risk assessment.
| Risk category | Primary tumor size (cm) | Mitotic count (per 50 high-power fields) |
|---|---|---|
| Very low risk | < 2 | < 5 |
| Low risk | 2–5 | < 5 |
| Intermediate risk | < 5 | 6–10 |
| 5–10 | < 5 | |
| High risk | > 5 | > 5 |
| > 10 | Any mitotic rate | |
| Any size | >10 | |
