Table 1 Suggested guidelines for assessing the malignant potential of gastric GISTs of different sizes and mitotic activity
Benign | |
|---|---|
Group 1 (no larger than 2 cm, no more than 5 mitoses/50 HPF) | |
Probably benign (very low malignant potential) | |
Group 2 (> 2 cm and ≤ 5 cm, no more than 5 mitoses/50 HPF) | |
Group 3a (> 5cm and ≤ 10 cm, no more than 5 mitoses/50 HPF) | |
Uncertain or low malignant potential | |
Group 4 (no larger than 2 cm, > 5 mitoses/50 HPF) | |
Low to moderate malignant potential | |
Group 3b (> 10 cm, no more than 5 mitoses/50 HPF) | |
Group 5 (> 2 cm and ≤ 5 cm, > 5 mitoses/50 HPF) | |
High malignant potential | |
Group 6a (> 5cm and ≤ 10 cm, > 5 mitoses/50 HPF) | |
Group 6b (> 10 cm, > 5 mitoses/50 HPF) | |