Table 1.

Risk of recurrence in patients after removal of a section of a primary GIST – prognostic groups of different localization according to ESMO guidelines [21]

Prognostic Group	Tumour parameters		Percentage of recurrence after surgical treatment (%)
	Tumour size (cm)	Mitotic rate	Stomach	Duodenum	Jejunum/ileum	Rectum
1	≤ 2	≤ 5/50 HPF	0 very low	0 very low	0 very low	0 very low
2	> 2 to ≤ 5		1.9 low	8.3 low	4.3 low	8.5 low
3a	> 5 to ≤ 10		3.6 low	no data	24 average	no data
3b	> 10		12 average	34 high	52 high	57 high
4	≤ 2	> 5/50 HPF	0 very low	no data	50 high	54 high
5	> 2 to ≤ 5		16 average	50 high	73 high	52 high
6a	> 5 to ≤ 10		55 high	no data	85 high	no data
6b	> 10		86 high	90 high	90 high	71 high