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Table 1 Demographics of the patient population

From: A modified subclassification to evaluate the survival of patients with N3 gastric cancer: an international database study

Characteristic SEER FMUUH P value Overall
Mean age, y (%) 64.2 ± 13.7 58.9 ± 12.0 < 0.001 62.4 ± 13.4
Gender, n (%)
 Male 1024 (55.9) 674 (73.3) < 0.001 1698 (61.7)
 Female 809 (44.1) 246 (26.7) 1055 (38.3)
Ethnicity, n (%)
 White 662 (36.1) 0 < 0.001 662 (24.0)
 Asian 555 (30.3) 920 (100) < 0.001 1475 (53.6)
 Black 251 (13.7) 0 < 0.001 251 (9.1)
 Hispanic 346 (18.9) 0 < 0.001 346 (12.6)
 Native American 19 (1.0) 0 < 0.001 19 (0.7)
Histology, n (%)
 G1/G2 263 (14.3) 184 (20.0) < 0.001 447 (16.2)
 G3/G4 1570 (85.7) 736 (80.0) 2306 (83.8)
Median tumor size, mm 60 (2–220) 70 (10–200) 0.005 60 (2–220)
T-category, n (%)
 T1 48 (2.6) 9 (1.0) 0.004 57 (2.1)
 T2 83 (4.5) 32 (3.5) 0.194 115 (4.2)
 T3 616 (33.6) 115 (12.5) < 0.001 731 (26.6)
 T4a 834 (45.5) 549 (59.7) < 0.001 1383 (50.2)
 T4b 252 (13.7) 215 (23.4) < 0.001 467 (17.0)
N-category, n (%)
 N3a 1093 (59.6) 554 (60.2) 0.766 1647 (59.8)
 N3b 740 (40.4) 366 (39.8) 1106 (40.2)
Stage, n (%)
 IIB 39 (2.1) 7 (0.8) 0.008 46 (1.7)
 IIIA 59 (3.2) 25 (2.7) 0.471 84 (3.1)
 IIIB 892 (48.7) 421 (45.8) 0.150 1313 (47.7)
 IIIC 843 (46.0) 467 (50.8) 0.018 1310 (47.6)
Type of surgery, n (%)
 Proximal/distal gastrectomy 1274 (69.5) 350 (38.0) < 0.001 1624
 Total gastrectomy 559 (30.5) 570 (62.0) 1129
LNs examined, median 24 (16–90) 30 (16–80) < 0.001 26 (16–90)
 MLNs, median 14 (7–90) 14 (7–69) 0.469 14 (7–90)
  1. SEER, Surveillance, Epidemiology, and End Results database; FMUUH, Fujian Medical University Union Hospital;MLNs, metastatic lymph nodes; LNs, lymph nodes