Table 1.

Patient characteristics

Total no. of lesions (patients)	153 (140)
Mean (± SD) age, years	68.7 ± 10.4
Sex, male/female	102/38
Macroscopic type
0-I /0-IIa/0-IIb /0-IIc	9/51/1/92
Location
Upper/middle/lower	45/69/39
Mean (± SD) tumor size, mm	20.5 ± 14.4
Depth of invasion
M/SM1/SM2	93/17/43
Histology
Differentiated/undifferentiated	118/35
Ulcer scar
Positive/negative	29/124
Criteria for endoscopic resection
Absolute/expanded/non-indication	51/38/64

M: Mucosal cancer; SM1: Submucosal invasive cancer invaded into the submucosal layer < 500 μm from the muscularis mucosa; SM2: Submucosal invasive cancer with invasion of ≥ 500 μm into the submucosal layer.