Table 1 Proposed approach for defining risk of aggressive behaviour in GIST [9]
From: Gastrointestinal stromal tumor of the anal canal: an unusual presentation
Size | Mitotic Count | |
|---|---|---|
Very low risk | < 2 cm | < 5/50 HPF |
Low risk | 2–5 cm | < 5/50 HPF |
Intermediate risk | < 5 cm | 6–10/50 HPF |
5–10 cm | < 5/50 HPF | |
High risk | > 5 cm | > 5/50 HPF |
> 10 cm | Any mitotic rate | |
Any size | > 10/50 HPF |