Table 1. Patient demographics and characteristics of gastric cancer.
| Variables | Yonsei (n = 6025) | NCC (n = 3443) | TU (n = 560) |
|---|---|---|---|
| Age (years), mean ± SD | 57.6 ± 11.8 | 62.0 ± 11.6 | 65.6 ± 11.6 |
| Sex | |||
| Male, n (%) | 4002 (66.4%) | 2346 (68.1%) | 395 (70.5%) |
| Female, n (%) | 2023 (33.6%) | 1097 (31.9%) | 165 (29.5%) |
| Extent of gastrectomy | |||
| Distal, n (%) | 4633 (76.9%) | 1649 (47.9%) | 230 (41.1%) |
| Total, n (%) | 1387 (23.0%) | 809 (23.5%) | 137 (24.4%) |
| †Others, n (%) | 5 (0.1%) | 985 (28.6%) | 193 (34.5%) |
| pT stage | |||
| mucosa, n (%) | 1641 (27.2%) | 946(27.5%) | 123 (22%) |
| submucosa, n (%) | 1369 (22.7%) | 1169(34.0%) | 207 (37.0%) |
| proper muscle, n (%) | 780 (12.9%) | 378(11.0%) | 59 (10.5%) |
| subserosa, n (%) | 665 (11.0%) | 455(13.2%) | 92 (16.4%) |
| serosa, n (%) | 1506 (25.0%) | 464(13.4%) | 75 (13.4%) |
| adjacent organ, n (%) | 64 (1.1%) | 31(0.9%) | 3 (0.5%) |
| Number of metastatic LNs | |||
| Mean ± SD | 3.2 ± 7.4 (8.5 ± 10.1)* | 1.7±4.1(5.2±5.9)* | 2.2 ± 6.1 (7.0 ± 9.3)* |
| 0, n (%) | 3794 (63.0%) | 2326(67.6%) | 386 (68.9%) |
| 1–2, n (%) | 716 (11.9%) | 488(14.2%) | 64 (11.4%) |
| 3–6, n (%) | 600 (10.0%) | 335(9.7%) | 51 (9.1%) |
| 7–15, n (%) | 541 (9.0%) | 219(6.4%) | 42 (7.5%) |
| ≥16, n (%) | 374 (6.2%) | 75(2.2%) | 17 (3.0%) |
| Retrieved LNs, mean ± SD | 40.7 ± 15.5 | 43.0±72.9 | 38.4 ± 20.1 |
LN, lymph node; SD, standard deviation; NCC, National Cancer Center Hospital in Japan; TU, Tokyo University Hospital in Japan
*mean and SD of the number of metastatic LNs except pN0
† pylorus-preserving gastrectomy or proximal gastrectomy