Abstract
AimsPositron emission tomography/computed tomography (PET/CT) is used to restage head and neck cancer 3 months after chemoradiotherapy. The purpose of this study was to determine the negative predictive value (NPV) of a scan reported as having no abnormal uptake and the positive predictive values (PPV) for different maximum standardised uptake value (SUVmax) thresholds. Materials and methodsPatients with squamous cell carcinoma of the oro-/hypopharynx/larynx (n = 206) were included. SUVmax and subsequent locoregional recurrence were documented. ResultsThe median SUVmax was 11.2 (range 4–33)/4.6 (range 2–30), respectively, in patients with/without definite primary site recurrence (P = 0.004). The median SUVmax was 4.4 (range 2.6–15.6)/3.1 (range 2.1–4.6), respectively, in patients with/without definite nodal recurrence (P = 0.003). The NPV for a scan reported as having no abnormal uptake was 92%. The PPV for the SUVmax thresholds 4, 6 and 8, respectively, were 53, 65 and 92% (primary site) and 93, 100 and 100% (nodes). ConclusionsThe NPV of PET/CT after chemoradiation is consistent with the literature and underlines the importance of PET/CT in restaging the primary site if salvage neck dissection is considered. The overall PPV of PET/CT remains low but is high for nodal SUVmax > 4. These data could be used to design risk-stratified follow-up schedules.
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