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Table 1 Baseline characteristics of the study groups

From: Surgical resection of the primary tumor leads to prolonged survival in metastatic pancreatic neuroendocrine carcinoma

Variable Group Patient characteristics
Total n = 350 Resection of primary tumor n = 50 No resection of primary tumor n = 300 p
Sex      0.101
Female 145 (41.4%) 26 (52.0%) 119 (39.7%)  
Male 205 (58.6%) 24 (48.0%) 181 (60.3%)  
Race      0.726
White 278 (79.4%) 39 (78.0%) 239 (79.7%)  
Black 40 (11.4%) 5 (10.0%) 35 (11.7%)  
Other 32 (9.1%) 6 (12.0%) 26 (8.7%)  
Age      0.001
< 65 years 191 (54.6%) 38 (76.0%) 153 (51.0%)  
≥ 65 years 159 (45.4%) 12 (24.0%) 147 (49.0%)  
Grade      0.284
III 236 (67.4%) 37 (74.0%) 199 (66.3%)  
IV 114 (32.6%) 13 (26.0%) 101 (33.7%)  
Tumor size      < 0.001*
< 2 cm 4 (1.1%) 1 (2.0%) 3 (1.0%) 0.872
2–4 cm 96 (27.4%) 20 (40.0%) 76 (25.3%)  
> 4 cm 152 (43.4%) 28 (56.0%) 124 (41.3%)  
Unknown 98 (28.0%) 1 (2.0%) 97 (32.3%)  
Tumor location      < 0.001*
Head/overlapping 177 (50.6%) 23 (46.0%) 154 (51.3%) 0.016
Body/tail 108 (30.9%) 26 (52.0%) 82 (27.3%)  
Unknown 65 (18.6%) 1 (2.0%) 64 (21.3%)  
Lymph node metastases      < 0.001*
No 14 (4.0%) 8 (16.0%) 6 (2.0%) 0.078
Yes 46 (13.1%) 37 (74.0%) 9 (3.0%)  
Unknown 290 (82.9%) 5 (10.0%) 285 (95.0%)  
Chemotherapy      0.017
No 129 (36.9%) 26 (52.0%) 103 (34.3%)  
Yes 221 (63.1%) 24 (48.0%) 197 (65.7%)  
Year of diagnosis      0.099
< 2010 212 (60.6%) 25 (50%) 187 (62.3%)  
≥ 2010 138 (39.4%) 25 (50%) 113 (37.7%)  
  1. *p value among all groups. p value among the groups except the “unknown” group