Table 1. Patient and tumor characteristics.
| Characteristics | Total | Treatment | ||||
|---|---|---|---|---|---|---|
| ESD | Surgery | |||||
| Patient characteristics | ||||||
| No. of patients | 386 | 265 | 121 | |||
| Age (yr) | 63 (54–72) | 66 (58–74) | 55 (50–65) | |||
| Sex | ||||||
| Female | 122 (31.6) | 72 (27.2) | 50 (41.3) | |||
| Male | 264 (68.4) | 193 (72.8) | 71 (58.7) | |||
| No. of EGC lesion | ||||||
| One | 372 (96.4) | 251 (94.7) | 121 (100) | |||
| Two | 13 (3.4) | 13 (4.9) | 0 (0) | |||
| Three | 1 (0.3) | 1 (0.4) | 0 (0) | |||
| Tumor characteristics | ||||||
| No. of tumors | 401 | 280 | 121 | |||
| Tumor location | ||||||
| Upper third | 23 (5.7) | 13 (4.6) | 10 (8.3) | |||
| Middle third | 165 (41.2) | 91 (32.5) | 74 (61.2) | |||
| Lower third | 213 (53.1) | 176 (62.9) | 37 (30.6) | |||
| Tumor size (cm) | 1.96±1.09 | 1.82±1.07 | 2.28±1.07 | |||
| Tumor histology | ||||||
| Differentiated type | 315 (78.6) | 274 (97.9) | 40 (33.1) | |||
| Undifferentiated type | 86 (21.5) | 6 (2.1) | 81 (66.9) | |||
| Ulcer finding | ||||||
| Absence | 241 (60.1) | 182 (65.0) | 59 (48.8) | |||
| Presence | 160 (39.9) | 98 (35.0) | 62 (51.2) | |||
| Tumor depth | ||||||
| Mucosa | 284 (70.8) | 215 (76.8) | 69 (57.0) | |||
| Submucosa | 117 (29.2) | 65 (23.2) | 52 (43.0) | |||
| Submucosa <500 µm | 47 (11.7) | 30 (10.7) | 17 (14.1) | |||
| Submucosa ≥500 µm | 70 (17.5) | 35 (12.5) | 35 (28.9) | |||
| LVI | ||||||
| Absence | 363 (90.5) | 260 (92.9) | 103 (85.1) | |||
| Presence | 38 (9.5) | 20 (7.1) | 18 (14.9) | |||
| Lymph node metastasis* | ||||||
| Absence | 394 (98.3) | - | 114 (94.2) | |||
| Presence | 7 (1.7) | - | 7 (5.8) | |||
Pathology evaluation findings from 2-mm interval sections were presented. Values are presented as number of patients (%), median (interquartile range), or mean±standard deviation.
EGC = early gastric cancer; ESD = endoscopic submucosal dissection; LVI = lymphovascular invasion.
*Status of lymph node metastasis was evaluated only in patients with EGC who underwent resection.