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Table 1 Demographical and clinicopathological characteristics of patients over 40 years old with surgically resected PC

From: Overall survival in patients over 40 years old with surgically resected pancreatic carcinoma: a SEER-based nomogram analysis

Variable Variable level N Training Set
(n = 4242)
n(%)
Validation Set
(n = 2099)
n (%)
p-value
Age (years) < 60 1849 1231 (29.0) 618 (29.4) 0.727
≥60 4492 3011 (71.0) 1481 (70.6)  
Gender Male 3260 2196 (51.8) 1064 (50.7) 0.419
Female 3081 2046 (48.2) 1035 (49.3)  
Tumor Location in pancreas Head 4750 3174 (74.8) 1576 (75.1) 0.778
Body 605 400 (9.4) 205 (9.8)  
Tail 986 668 (15.8) 318 (15.1)  
Grade Well differentiated 1350 928 (21.9) 422 (20.1) 0.433
Moderately differentiated 2866 1898 (44.7) 968 (46.1)  
Poorly differentiated 2028 1352 (31.9) 676 (32.2)  
Undifferentiated 97 64 (1.5) 33 (1.6)  
AJCC TNM stage I 1073 713 (16.8) 360 (17.2) 0.732
II 5268 3529 (83.2) 1739 (82.8)  
Regional lymph nodes surgery None 42 31 (0.7) 11 (0.5) 0.332
1~3 374 240 (5.7) 134 (6.4)  
≥4 5925 3971 (93.6) 1954 (93.1)  
Tumor size (cm) ≤2 1232 854 (20.1) 378 (18.0) 0.128
(2~4) 3195 2123 (50.0) 1072 (51.1)  
≥4 1914 1265 (29.9) 649 (30.9)  
LNR ≤0.1732 4348 2926 (69.0) 1422 (67.7) 0.321
> 0.1732 1993 1316 (31.0) 677 (32.3)  
  1. Abbreviations: PC pancreatic carcinoma, AJCC American Joint Committee on Cancer, TNM Tumor-Node-Metastasis, LNR lymph node ratio