Table 1.

Classification of primary gastrointestinal tumours by risk of metastasis

Risk category	Size	Mitotic count
Very low	<2 cm	<5 per 50 HPFs
Low	2–5 cm	<5 per 50 HPFs
Intermediate	<5 cm	6–10 per HPFs
	5–10 cm	<5 per 50 HPFs
High	>5 cm	>5 per 50 HPFs
	>10 cm	Any mitotic rate
	Any size	>10 per 50 HPFs

HPF, high-powered field.

Adapted from Bertagnolli.⁴