Endoscopic submucosal dissection for esophageal precancerous lesions and early esophageal carcinoma: Analysis of efficacy and serum tumor markers

Figure 1 Comparative analysis of the 6-month postoperative recurrence rates between the control group (n = 60; 5 recurrence cases) and the research group (n = 60; 2 recurrence cases; 8. 33% vs 3.33%). Intergroup comparison was performed using the χ² test.