Table 7. Reasons for no curative resection and incidence of additional operations.

Reason for no curative resection	Number of patients	Additional surgical operation
Positive margin	9	6
Invasion ≥ SM2	5	4
Invasion of lymph duct	3	2
SM1 and (size > 30 mm or UL( + ))	2	2
Undifferentiated-type and size > 20 mm	1	0
Total	20 (13.9 %)	14 (9.7 %)

SM1, tumor invasion to submucosa ( < 500 μm); SM2; tumor invasion to submucosa ( ≥ 500 μm); UL( + ), with ulcerative findings.