Table I.

Patient characteristics (n=1002).

Characteristic	No. patients	%
Gender
Male	894	89
Female	108	11
Length of tumor (cm)
<5	568	57
≥5	434	43
Depth of invasion
pT1	100	10
pT2	170	17
pT3	669	67
pT4	63	6
Lymph node metastasis
pN0	426	43
pN1	289	29
pN2	192	19
pN3	95	9
Histologic gradea
Well SCC	200	20
Mod. SCC	613	61
Poor SCC	189	19
Vessel involvement
No	862	86
Yes	140	14

^aWell-, mod. (moderately) and poorly differentiated squamous cell carcinomas (SCC). The median patient age was 58 years (range, 36–86).