TABLE 1

Patients and Reactive Neck Lymph Nodes

Patient no.	Age (y)	Sex	Primary site	T stage	Pathology	Interval^* (d)	Previous therapy	Level of LNs	Diameter of LNs (mm)	SUVmax of LNs	No. of total follicles	No. of secondary follicles	Follicular reactivity index (%)
1	58	F	R tongue	T1	SCC	13		L II^†	12.5 × 7.5	2.10^‡	120	37.5	31.3
2	63	F	L buccal mucosa	T2	SCC	23	Operation^§	R II^†	11.5 × 5.5	2.91	82	21.5	26.2
3	55	M	R tongue	T1	SCC	17		R II^†	15 × 10.5	2.58	92.5	30	32.4
								R III	19 × 8	1.34	67	3	4.5
4	78	M	Palate	T1	Adenoid cystic carcinoma	28		R II^†	14 × 7.5	1.83	147	6	4.1
								L II^†	14 × 8	2.08	115.5	13	11.3
5	63	M	R tongue	T1	SCC	28	Chemotherapy^‖	R II^¶	12 × 9	3.73	70.3	29.8	42.3
6	72	F	R buccal mucosa	T1	SCC	21	Chemotherapy^‖	R II^†	10 × 8	2.05	61.5	5.5	8.9
								R III^†	10 × 8	1.85	95	4	4.2
7	64	M	L tongue	T1	SCC	16		L II	16 × 10	2.17	198	46	23.2
8	68	F	R tongue	T1	SCC	15		R II	15 × 8	1.90	66	9	13.6
9	59	M	L gingiva	T1	SCC	30		L II	19 × 8	1.43	66	4	6.1
10	26	M	R tongue	T2	SCC	23		L I	12 × 7	1.47	98	20	20.4
								R II	14 × 10	1.82	128	13	10.2
								L II	12 × 7	2.91	57	20	35.1
								R III	14 × 9	3.22	115	41	35.7
								L III	16 × 10	2.75	162	55	34.0
								R V^†	13.5 × 8.5	2.35	90	25.5	28.3
11	83	F	R gingiva	T2	SCC	27		R I	10 × 7	2.28	73	21	28.8
								R II	18 × 11	2.15	188	49	26.1

↵* Days between PET/CT study and surgery.
↵† Average values of 2 lymph nodes.
↵‡ SUV was estimated on PET image of torso.
↵§ Primary lesion and ipsilateral neck LNs had been resected 1 y and 8 mo before.
↵‖ Chemotherapy by tegafur with gimeracil (TS-1; Taiho) had been taken orally for 1 mo before operation.
↵¶ Average values of 4 lymph nodes.
Level I = submental and submandibular nodes; level II = upper deep cervical nodes; level III = middle deep cervical nodes; level IV = lower deep cervical nodes; level V = spinal accessory and transverse cervical nodes.
SCC = squamous cell carcinoma; LNs = lymph nodes.