Table 1.
Demographics of Patient Population
| Category | SEER | Yonsei | p Value | Overall |
|---|---|---|---|---|
| Mean age, y | 65.9 | 55.9 | <0.001 | 61.4 |
| Sex, n (%) | ||||
| Male | 8524 (61.2) | 7527 (66.3) | <0.001 | 16051(63.5) |
| Female | 5408 (38.8) | 3831 (33.7) | 9239 (36.5) | |
| Ethnicity, n (%) | ||||
| White | 6553 (47) | 0 | <0.05 | 6553 (25.9) |
| Asian | 2904 (20.8) | 11358 (100) | <0.05 | 14262 (56.4) |
| Black | 1829 (13.1) | 0 | <0.05 | 1829 (7.2) |
| Hispanic | 2482 (17.8) | 0 | <0.05 | 2482 (9.8) |
| Native American | 123 (0.9) | 0 | <0.05 | 123 (0.5) |
| Unknown | 41 (0.3) | 0 | <0.05 | 41 (0.2) |
| Histology, n (%) | ||||
| AWD | 563 (4) | 1541 (13.6) | <0.05 | 2104 (8.3) |
| AMD | 3281 (23.6) | 3160 (27.8) | <0.05 | 6441 (25.5) |
| APD | 6075 (43.6) | 3883 (34.2) | <0.05 | 9958 (39.4) |
| MUC | 392 (2.8) | 334 (2.9) | NS | 726 (2.9) |
| SRC | 1844 (13.2) | 2198 (19.4) | <0.05 | 4042 (16) |
| Unknown | 1777 (12.8) | 242 (2.1) | <0.05 | 2019 (8) |
| T-classification, n (%) | ||||
| T1a | 548 (3.9) | 2626 (23.1) | <0.05 | 3174 (12.6) |
| T1b | 2089 (15) | 2290 (20.2) | <0.05 | 4379 (17.3) |
| T2 | 1927 (13.8) | 1509 (13.3) | NS | 3436 (13.6) |
| T3 | 3097 (22.2) | 1567(13.8) | <0.05 | 4664 (18.4) |
| T4a | 5213 (37.4) | 3063 (27) | <0.05 | 8276 (32.7) |
| T4b | 1058 (7.6) | 303 (2.7) | <0.05 | 1361 (5.4) |
| N-Classification, n (%) | ||||
| N0 | 2099 (15.1) | 6198 (54.6) | <0.05 | 8297 (32.8) |
| N1 | 997 (7.2) | 1419 (12.5) | <0.05 | 2416 (0.6) |
| N2 | 1121 (8) | 1346 (11.9) | <0.05 | 2467 (9.8) |
| N3 | 2459 (17.7) | 2128 (18.7) | <0.05 | 4587 (18.1) |
| Nx | 7259 (52.1) | 267 (2.4) | <0.05 | 7523 (29.7) |
| Stage, n (%) | ||||
| Ia | 747 (5.4) | 4235 (37.3) | <0.05 | 4982 (19.7) |
| Ib | 530 (3.8) | 1142 (10.1) | <0.05 | 1672 (6.6) |
| IIa | 712 (5.1) | 964 (8.5) | <0.05 | 1676 (6.6) |
| IIb | 891 (6.4) | 1142 (10.1) | <0.05 | 2033 (8) |
| IIIa | 830 (6) | 889 (7.8) | <0.05 | 1719 (6.8) |
| IIIb | 1177 (8.4) | 1131 (10) | <0.05 | 2308 (9.1) |
| IIIc | 1789 (12.8) | 1588 (14) | <0.05 | 3377 (13.4) |
| Unable to stage | 7256 (52.1) | 267 (2.4) | <0.05 | 7523 (29.7) |
| Extent of gastrectomy, n (%) | ||||
| Sub-total | 10410 (74.7) | 84.3 (74.2) | NS | 18843 (74.5) |
| Total | 3522 (25.3) | 2925 (25.8) | 6447 (25.5) | |
| Lymph nodes examined, mean | 16.6 | 39.7 | <0.001 | 26.9 |
| Lymph nodes positive, mean | 4.32 | 3.87 | <0.001 | 4.12 |
AWD, adenocarcinoma well differentiated; AMD, adenocarcinoma moderately differentiated; APD, adenocarcinoma poorly differentiated; MUC, mucinous adenocarcinoma; SRC, signet ring cell adenocarcinoma; NS, not statistically significant; SEER, Surveillance, Epidemiology, and End Results database