Table 2 Modified NIH risk classification for primary GIST
From: UK clinical practice guidelines for the management of gastrointestinal stromal tumours (GIST)
Risk category | Tumour size (cm) | Mitotic index (per 50 HPFs) | Primary tumour site |
|---|---|---|---|
Very low risk | <2.0 | ≤5 | Any |
Low risk | 2.1–5.0 | ≤5 | Any |
Intermediate risk | 2.1–5.0 | >5 | Gastric |
<5.0 | 6–10 | Any | |
5.1–10.0 | ≤5 | Gastric | |
High risk | Any | Any | Tumour rupture |
>10 | Any | Any | |
>5.0 | >5 | Any | |
2.1-5.0 | >5 | Non gastric | |
5.1–10.0 | ≤5 | Non gastric |