Table 1 Clinicopathological characteristics of the HNSCC population

Patient no.	Age (years)	Gender	Tumour location	cTNM	No. SLN	SLN location ^a	Histopathology of SLN ^b	Bilateral neck dissection	No. of non-SLN (neck dissection)	Final pN stage ^c
1	29	M	OT	T₂N₀M₀	4	IB, IIA	MI	No	29	pN₁
2	58	M	OT	T₁N₀M₀	3	III	MA	No	25	pN₁
3	51	M	OC	T₁N₀M₀	7	IB, II A, III	MI	Yes	27	pN₁
4	53	M	OT	T₂N₀M₀	5	IB, IIA, III	0	Yes	29	pN₀
5	37	M	OT	T₂N₀M₀	3	IB, IIA, IV	MA	No	18	pN₁
6	44	M	OC	T₂N₀M₀	4	IA,IB, III	MA	Yes	84	pN_2bR+
7	55	M	OC	T₂N₀M₀	3	IB, III	ITC	Yes	36	pN₀
8	47	F	OT	T₁N₀M₀	1	III	ITC	No	16	pN₀
9	59	M	OP	T₂N₀M₀	2	III	0	No	21	pN₀
10	61	M	OC	T₂N₀M₀	3	IB, IIA	0	Yes	40	pN₀
11	57	M	OC	T₁N₀M₀	5	IB, IIA, III, IV	0	Yes	36	pN₀
12	31	F	OC	T₂N₀M₀	4	IIA, IV	ITC	No	17	pN₀
13	66	M	OT	T₁N₀M₀	3	IB, IIA, III	ITC	No	17	pN₀
14	49	F	OT	T₂N₀M₀	3	III	0	Yes	8	pN₀
15	79	M	OP	T₁N₀M₀	4	IIA	0	No	3	pN₀
16	75	F	OP	T₂N₀M₀	4	II A,III	0	No	5	pN₀
17	62	M	OT	T₂N₀M₀	2	III	0	No	22	pN₀
18	60	F	OC	T₁N₀M₀	5	IA, IB, IV	0	Yes	13	pN₀
19	61	M	OC	T₂N₀M₀	3	IA, III	MI	Yes	44	pN2b
20	59	F	OP	T₂N₀M₀	2	IIA, IIB	ITC	No	13	pN₀
21	56	F	OP	T₁N₀M₀	4	II A,III	0	No	17	pN₀
22	49	M	OC	T₁N₀M₀	4	IB, IIA, V	ITC	Yes	22	pN₀

Abbreviations: cTNM=clinical tumour node-metastasis stage; FOM=floor of mouth; HNSCC=head and neck squamous cell carcinoma; ITC=isolated tumour cell; MA=macrometastasis; MI=micrometastasis; OP=oropharynx; OT=oral tongue; SLN=sentinel lymph node; SR=sex ratio; m=mean; T=total.
^a Cervical lymph node levels according to Robbins et al (2002).
^b Pathological examination of the SLN by serial step sectioning and immunohistochemistry according to the classification of Hermanek (6).
^c pN stage was established according to the SLN and non-SLN status. The presence of isolated tumour cells was not taken into account in determining the final pN stage. No false negative cases were noted (pN+ with negative SLN)

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