Table 2.
Characteristics of early gastric cancers resected by ESD in total and per study group
| Characteristic | Total lesions n = 94 (April 2005–June 2012) |
LDA-interrupted group n = 66 (April 2005–November 2010) |
LDA-continued group n = 28 (December 2010–June 2012) |
P value |
|---|---|---|---|---|
| Tumor location (%) | n.s. | |||
| Upper | 19 (20.2) | 11 (16.7) | 8 (28.6) | |
| Middle | 24 (25.5) | 20 (30.3) | 4 (14.3) | |
| Lower | 51 (54.3) | 35 (53.0) | 16 (57.1) | |
| Macroscopic type (%) | n.s | |||
| Depressed | 43 (45.7) | 29 (43.9) | 14 (50.0) | |
| Nondepressed | 51 (54.3) | 37 (56.1) | 14 (50.0) | |
| Tumor size (mm) (SD) | 17.1 (10.9) | 16.6 (9.9) | 18.3 (13.2) | n.s |
| Maximum diameter of ulcer (mm) (SD) | 40.7 (22.9) | 38.5 (16.0) | 46.0 (34.0) | n.s |
| Histology (%) | n.s | |||
| Differentiated | 90 (93.8) | 63 (95.5) | 27 (96.4) | |
| Undifferentiated | 6 (6.2) | 3 (4.5) | 1 (3.6) | |
| Depth of invasion (%) | n.s | |||
| Mucosa | 83 (86.5) | 57 (86.4) | 26 (92.9) | |
| Submucosa | 11 (13.5) | 9 (13.6) | 2 (7.1) | |
| Ulceration (%) | n.s | |||
| Present | 9 (9.6) | 6 (9.1) | 3 (10.7) | |
| Absent | 85 (90.4) | 60 (90.9) | 25 (89.3) |
ESD endoscopic submucosal dissection, LDA low-dose aspirin, SD standard deviation