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Table 2 Detection of CK20 positive tumor cells (CTC) in the blood of patients with rectal cancer

From: Cytokeratin 20 positive circulating tumor cells are a marker for response after neoadjuvant chemoradiation but not for prognosis in patients with rectal cancer

Variable Category Rate of CK20 positive CTC χ2-test (p-values)
Neoadjuvant RCTX Yes 46.8 % (37/79) p = 0.002
  No 24.7 % (43/174)  
Tumor localisation Upper 1/3 31 % (27/87) p = 0.42
  Middle 1/3 27.6 % (29/105)  
  Lower 1/3 37 % (23/61)  
pN- status pN+ 30 % (31/103) p = 0.6
  pN- 32.6 % (49/150)  
UICC stage I 30.6 % (23/75) p = 0.99
  II 32.3 % (23/71)  
  III 31.3 % (25/80)  
  IV 33.3 % (9/27)