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Table 1 Baseline characteristics of patients

From: A novel nomogram for predicting liver metastasis in patients with gastrointestinal stromal tumor: a SEER-based study

Characteristics SEER cohort (%) P
Entire cohort n = 3797 Training n = 2849 Testing
n = 948
Age 62.25 ± 13.67 62.12 ± 13.90 62.38 ± 13.43 0.616
Sex     0.962
 Male 1908(50.2) 1431(50.2) 477(47.1)  
 Female 1889(49.8) 1418(49.8) 471(52.9)  
Marriage     0.158
 Married 2143(56.4) 1609(56.4) 534(56.3)  
 Unmarried 1447(38.1) 1096(38.4) 351(37.0)  
 Unknown 207(5.5) 144(5.2) 6.6(6.7)  
Race     0.359
 White 2534(66.7) 1909(67.0) 625(65.9)  
 Black 684(18.0) 519(18.2) 165(17.4)  
 Others 579(15.3) 421(14.8) 158(16.7)  
Tumor location     0.716
 Stomach 1509(39.7) 1119(39.2) 390(41.1)  
 Duodenum 213(5.6) 158(5.5) 55(5.8)  
 Jejunum 272(7.1) 208(7.3) 64(6.7)  
 Ileum 104(2.7) 86(3.0) 18(1.8)  
 Colon 79(2.0) 60(2.1) 19(2.0)  
 Rectum 104(2.7) 79(2.7) 25(2.6)  
 Others 457(12.0) 340(11.9) 117(12.3)  
 Unknown 1059(28.2) 799(28.3) 260(27.7)  
Tumor size     0.003
  ≤ 2 cm 446(11.7) 356(12.4) 90(9.4)  
 2–5 cm 1066(28.0) 797(27.9) 269(28.3)  
 5–10 cm 1088(28.6) 839(29.4) 249(26.2)  
  > 10 cm 896(23.5) 645(22.6) 251(26.4)  
 Unknown 301(8.2) 212(7.7) 89(9.7)  
N stage     0.319
 N0 3531(93.1) 2658(93.4) 873(92.2)  
 N1 131(3.4) 97(3.4) 34(3.5)  
 Unknown 135(3.5) 94(3.2) 41(4.3)  
Mitotic rate     0.794
  < 5/50 HPFs 1835(48.3) 1386(48.6) 449(47.3)  
  ≥ 5/50 HPFs 814(21.4) 610(21.4) 204(21.5)  
 Unknown 1148(30.3) 853(30.0) 295(31.2)  
Liver metastasis     0.823
 No 3368(88.7) 2529(88.7) 839(88.5)  
 Yes 429(11.3) 320(11.3) 109(11.5)  
  1. SEER Surveillance, Epidemiology, and End Results, HPFs high power fields