Table I.

Patient characteristics.

Variable	Number	%
Sex
Male	44	81.5
Female	10	18.5
Smoker
Yes	34	63.0
No	20	37.0
Cancer type
Adenocarcinoma	21	38.9
Squamous cell carcinoma	33	61.1
Differentiation
Low-Moderate	49	90.7
High	5	9.3
Tumor T stage
T1	5	9.3
T2	45	83.3
T3	4	7.4
Tumor N stage
N0	15	27.8
N1-N3	39	72.2
Clinical stage
I–II	33	61.1
III	21	38.9

T, tumor size; N, lymph node metastasis.