Table 2 Demographic information for patients with signet ring cell carcinoma after PSM
| Â | All patients (n = 3002), n (%) | Non-surgery group (n = 1501), n (%) | Surgery group (n = 1501), n (%) | P |
|---|---|---|---|---|
Age | Â | Â | Â | 0.684 |
 < 50 | 525 (17.5) | 266 (17.7) | 259 (17.3) |  |
 50–59 | 553 (18.4) | 278 (18.5) | 275 (18.3) |  |
 60–69 | 631 (21.0) | 320 (21.3) | 311 (20.7) |  |
 70–79 | 692 (23.1) | 329 (21.9) | 363 (24.2) |  |
 > 80 | 601 (20.0) | 308 (20.5) | 293 (19.5) |  |
Gender | Â | Â | Â | 1 |
 Female | 1476 (49.2) | 738 (49.2) | 738 (49.2) |  |
 Male | 1526 (50.8) | 763 (50.8) | 763 (50.8) |  |
Race | Â | Â | Â | 0.214 |
 Black | 365 (12.2) | 194 (12.9) | 171 (11.4) |  |
 White | 2153 (71.7) | 1079 (71.9) | 1074 (71.6) |  |
 Other | 484 (16.1) | 228 (15.2) | 256 (17.1) |  |
Primary site | Â | Â | Â | 0.959 |
 Cardia, NOS | 562 (18.7) | 271 (18.1) | 291 (19.4) |  |
 Fundus of stomach | 99 ( 3.3) | 50 (3.3) | 49 (3.3) |  |
 Body of stomach | 355 (11.8) | 176 (11.7) | 179 (11.9) |  |
 Gastric antrum | 726 (24.2) | 361 (24.1) | 365 (24.3) |  |
 Pylorus | 80 ( 2.7) | 43 (2.9) | 37 (2.5) |  |
 Lesser curvature of stomach, NOS | 204 ( 6.8) | 110 (7.3) | 94 (6.3) |  |
 Greater curvature of stomach, NOS | 124 ( 4.1) | 61 (4.1) | 63 (4.2) |  |
 Overlapping lesion of stomach | 300 (10.0) | 151 (10.1) | 149 (9.9) |  |
 Stomach, NOS | 552 (18.4) | 278 (18.5) | 274 (18.3) |  |
Summary stage | Â | Â | Â | 0.684 |
 Unknown/unstaged | 107 ( 3.6) | 49 (3.3) | 58 (3.9) |  |
 Distant | 951 (31.7) | 481 (32) | 470 (31.3) |  |
 Localized | 1060 (35.3) | 538 (35.8) | 522 (34.8) |  |
 Regional | 884 (29.4) | 433 (28.8) | 451 (30) |  |
AJCC stage group | Â | Â | Â | 0.915 |
 Unknown Stage | 199 ( 6.6) | 95 (6.3) | 104 (6.9) |  |
 IA | 800 (26.6) | 410 (27.3) | 390 (26) |  |
 IB | 352 (11.7) | 174 (11.6) | 178 (11.9) |  |
 II | 330 (11.0) | 168 (11.2) | 162 (10.8) |  |
 IIIA | 241 ( 8.0) | 113 (7.5) | 128 (8.5) |  |
 IIIB | 19 ( 0.6) | 10 (0.7) | 9 (0.6) |  |
 IV | 1061 (35.3) | 531 (35.4) | 530 (35.3) |  |
T stage | Â | Â | Â | 0.978 |
 T0 | 1 ( 0.0) | 0 (0) | 1 (0.1) |  |
 T1 | 1000 (33.3) | 514 (34.2) | 486 (32.4) |  |
 T2a | 236 ( 7.9) | 118 (7.9) | 118 (7.9) |  |
 T2b | 580 (19.3) | 288 (19.2) | 292 (19.5) |  |
 T2NOS | 18 ( 0.6) | 9 (0.6) | 9 (0.6) |  |
 T3 | 421 (14.0) | 207 (13.8) | 214 (14.3) |  |
 T4 | 539 (18.0) | 264 (17.6) | 275 (18.3) |  |
 TX | 207 ( 6.9) | 101 (6.7) | 106 (7.1) |  |
N stage | Â | Â | Â | 0.263 |
 N0 | 1555 (51.8) | 794 (52.9) | 761 (50.7) |  |
 N1 | 952 (31.7) | 471 (31.4) | 481 (32) |  |
 N2 | 173 ( 5.8) | 78 (5.2) | 95 (6.3) |  |
 N3 | 93 ( 3.1) | 39 (2.6) | 54 (3.6) |  |
 NX | 229 ( 7.6) | 119 (7.9) | 110 (7.3) |  |
M stage | Â | Â | Â | 0.75 |
 M0 | 1998 (66.6) | 990 (66) | 1008 (67.2) |  |
 M1 | 893 (29.7) | 456 (30.4) | 437 (29.1) |  |
 MX | 111 ( 3.7) | 55 (3.7) | 56 (3.7) |  |
Radiation | Â | Â | Â | 0.279 |
 No | 2448 (81.5) | 1236 (82.3) | 1212 (80.7) |  |
 Yes | 554 (18.5) | 265 (17.7) | 289 (19.3) |  |
Chemotherapy | Â | Â | Â | 0.679 |
 No | 1870 (62.3) | 941 (62.7) | 929 (61.9) |  |
 Yes | 1132 (37.7) | 560 (37.3) | 572 (38.1) |  |
Systemic surgery | Â | Â | Â | 0.958 |
 No | 2576 (85.8) | 1289 (85.9) | 1287 (85.7) |  |
 Yes | 426 (14.2) | 212 (14.1) | 214 (14.3) |  |
Diagnosis | Â | Â | Â | 0.26 |
 2004–2007 | 1242 (41.4) | 600 (40) | 642 (42.8) |  |
 2008–2011 | 874 (29.1) | 442 (29.4) | 432 (28.8) |  |
 2012–2015 | 886 (29.5) | 459 (30.6) | 427 (28.4) |  |
Marital | Â | Â | Â | 0.686 |
 No | 626 (20.9) | 318 (21.2) | 308 (20.5) |  |
 Yes | 2376 (79.1) | 1183 (78.8) | 1193 (79.5) |  |
DX bone | Â | Â | Â | < 0.001 |
 No | 1236 (41.2) | 639 (42.6) | 597 (39.8) |  |
 Yes | 32 ( 1.1) | 28 (1.9) | 4 (0.3) |  |
 Unknown | 1734 (57.8) | 834 (55.6) | 900 (60) |  |
DX liver | Â | Â | Â | 0.003 |
 No | 1235 (41.1) | 640 (42.6) | 595 (39.6) |  |
 Yes | 34 ( 1.1) | 25 (1.7) | 9 (0.6) |  |
 Unknown | 1733 (57.7) | 836 (55.7) | 897 (59.8) |  |
DX lung | Â | Â | Â | 0.024 |
 No | 1240 (41.3) | 645 (43) | 595 (39.6) |  |
 Yes | 30 ( 1.0) | 20 (1.3) | 10 (0.7) |  |
 Unknown | 1732 (57.7) | 836 (55.7) | 896 (59.7) |  |
Resection range | Â | Â | Â | < 0.001 |
 No | 1501 (50.0) | 1501 (100) | 0 (0) |  |
 Local tumor resection | 84 ( 2.8) | 0 (0) | 84 (5.6) |  |
 Not-total gastrectomy surgery | 921 (30.7) | 0 (0) | 921 (61.4) |  |
 Total gastrectomy surgery | 427 (14.2) | 0 (0) | 427 (28.4) |  |
 Unknown | 69 ( 2.3) | 0 (0) | 69 (4.6) |  |