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Table 2 Comparison for the positive rate of CTCs before and after surgery in the endoscopic and the open group

From: Less micrometastatic risk related to circulating tumor cells after endoscopic breast cancer surgery compared to open surgery

Study periodEndoscopic group (n = 53)Open group (n = 57)P value a
Before surgery13(24.53)13(22.81)0.832
After surgery15(28.30)19(33.33)0.568
P value b0.8040.327 
  1. aComparison between endoscopic group and open group by Chi-square test
  2. bComparison between preoperation and postoperation period by McNemar test