Table 4:

Clinical Information of the 19 patients with negative PET/CT findings who had a recurrence

Patient	Site of Origin	TNM Stage	Location of Recurrence	Time Interval between Negative PET/CT Findings and Recurrence (mo)
1	Oropharynx	T2N2cM0	Local	7.5
2	Maxillofacial	Not recorded	Regional	12.7
3	Oropharynx	T3N2cM0	Local	26.4
4	Oropharynx	Not recorded	Regional	7.5
5	Maxillofacial	Not recorded	Distant	11.4
6	Larynx	T2N0M0	Local	9.0
7	Unknown primary	T0N2bM0	Regional	27.5
8	Unknown primary	T0N2bM0	Regional	23.0
9	Hypopharynx	T4N2bM0	Local	6.9
10	Hypopharynx	T2N2bM0	Local	3.7
11	Larynx	T2N0M0	Local	3.0
12	Oropharynx	T3N0M0	Local	4.6
13	Oropharynx	T4N1M0	Local	9.5
14	Oral cavity	Not recorded	Distant	7.1
15	Oral cavity	T3N1M0	Regional	37.3
16	Oral cavity	T3N2cM0	Local	16.9
17	Oral cavity, larynx	T2N2cM0	Regional	4.8
18	Larynx	Not recorded	Local	12.3
19	Oral cavity	Not recorded	Local	12.7