Fig. 4From: 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 0.90; 95% CI 0.48–1.69). B Similarly, there was no significant difference in DFS between the two groups (HR 0.88; 95% CI 0.47–1.65)Back to article page