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Table 5 Ferritin and gastrointestinal/colorectal cancer in patients with and without anemia

From: Ferritin above 100 mcg/L could rule out colon cancer, but not gastric or rectal cancer in patients with involuntary weight loss

   Gastrointestinal cancer Colorectal cancer
    AUC (95%CI)   AUC (95%CI)
Anemia, present (145 patients, 15/9 with gastrointestinal/ colorectal cancer) Ferritin P < 0.001 *   P < 0.001 *  
  (100mcg/L)     
  Ferritin P < 0.001 *   P = 0.005 *  
  Ferritin (mcg/L) P = 0.001 0.799 P < 0.001 0.839
  (50 mcg/L)     
    (0.713-0.813)   (0.765-0.913)
Anemia, absent (142 patients, 7/5 with gastrointestinal/ colorectal cancer) Ferritin (100mcg/L) P = 0.125*   P = 0.375*  
  Ferritin P = 0.196*   P = 0.154*  
  (50 mcg/L)     
  Ferritin (mcg/L) P = 0.536 0.663 P = 1.000 0.635
    (0.468-0.859)   (0.391-0.880)
  1. * Fisher’s exact test.
  2. Mann–Whitney U test.