From: Gastrointestinal Stromal Tumors Treatment (PDQ®)
PDQ Cancer Information Summaries [Internet].
Bethesda (MD): National Cancer Institute (US); 2002-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Table 2. Risk Assessment of Nongastric GISTs by Tumor Size and Mitotic Indexa
| Mitotic Index (mitoses/HPF) | Size (cm) | Metastasis Rate (%) | Risk of Progressive Disease |
|---|---|---|---|
| ≤5 per 50 | ≤2 | 0 | None |
| >2 to ≤5 | 1.9–8.5 | Low | |
| >5 to ≤10 | 24 | Insufficient data–Moderate | |
| >10 | 34–52 | High | |
| >5 per 50 | ≤2 | 50–54 | Insufficient data–High |
| >2 to ≤5 | 50–73 | High | |
| >5 to ≤10 | 85 | High | |
| >10 | 71–90 | High |