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Risk stratification criteria for primary resectable gastrointestinal stromal tumor porposed by Joensuu
| Risk category | Tumour size (cm) | Mitotic index (per 50 HPF) | Primary tumour site |
| Very low risk | ≤ 2.0 | ≤ 5 | Any |
| Low risk | 2.1-5.0 | ≤ 5 | Any |
| Intermediate risk | ≤ 5.0 | 6-10 | Gastric |
| 5.1-10.0 | ≤ 5 | Gastric | |
| High risk | Any | Any | Tumour rupture |
| > 10.0 | Any | Any | |
| Any | > 10 | Any | |
| > 5.0 | > 5 | Any | |
| ≤ 5.0 | > 5 | Non-gastric | |
| 5.1-10.0 | ≤ 5 | Non-gastric |
HPF: High-power field.
