Fig. 4

Kaplan-Meier plots of OS with and without salvage surgery in LA-HNSCC patients. OS did not differ significantly at postSUVmax ≥ 4.4 (a) or at postSUVmax < 4.4 (b). Abbreviations: OS, overall survival; HNSCC, head & neck squamous cell carcinoma; postSUVmax, maximum standardized uptake value in PET/CT after definitive CRT