Diagnostic accuracy of stereomicroscopy assessment of invasion depth in ex vivo specimens of early gastric cancer

Table 1 Clinicopathological features of the 854 patients and their lesions, n (%)

Variables	854 patients
Sex
Male	627 (73.4)
Female	227 (26.6)
Age, mean ± SD, years	62.0 ± 9.8
Location
Upper1	233 (27.2)
Middle2	279 (32.7)
Lower3	325 (38.1)
Residual stomach	17 (2.0)
Macroscopic type
Type 0-I	51 (6.0)
Type 0-IIa	362 (42.4)
Type 0-IIb	39 (4.6)
Type 0-IIc	390 (45.6)
Type 0-III	12 (1.4)
Tumor size (mm)
≤ 20	508 (59.5)
21-30	207 (24.2)
> 31	139 (16.3)
Ulceration
(−)	567 (66.4)
(+)	287 (33.6)
Histopathological type
Differentiated	704 (82.4)
Undifferentiated	150 (17.6)
Horizontal margin
(−)	830 (97.2)
(+)	24 (2.8)
Vertical margin
(−)	790 (92.5)
(+)	64 (7.5)

¹Upper third of the stomach consisting of cardia and upper body.

²Middle third of the stomach consisting of angle and middle body.

³Lower third of the stomach consisting of pylorus, antrum, and lower body.