NIH consensus scheme

NIH consensus scheme

A simple grading system that stratifies the risk of progression of gastrointestinal stromal tumours based on tumour size and mitotic activity.
 
Risk category—Size—Mitototic activity
• Very low risk— < 2 cm— < 5/50HPF.
• Low risk—2–5 cm— < 5/50HPF.
• Intermediate risk— < 5 cm—6–10/50HPF.
• Moderate risk—5–10 cm— < 5/50 HPF.
• High risk— > 5 cm— > 5/50 HPF.
• Very high risk— > 10 cm—Any mitotic rate.
• Extremely high risk—Any size— > 10/50 HPF.
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