Fig. 3From: Postoperative radiotherapy may not be necessary for locally advanced head and neck squamous cell carcinoma: a case-match multicentre studyA No significant difference was found in OS between the two arms (HR 0.88; 95% CI 0.50–1.58; P = 0.79). B Similarly, there was no significant difference in DFS between the two groups (HR 0.86; 95% CI 0.50–1.50; P = 0.76)Back to article page