Table 1.

Clinical characteristics of enrolled patients.

Characteristics	Total (n = 27)
Age (years)
Median (range)	62 (43–82)
Sex, no. (%)
Male	17 (62.97)
Female	10 (37.04)
Stage, no. (%)
I	13 (48.15)
II	9 (33.34)
IV	5 (18.52)
Lymph nodes metastasis, no. (%)
Positive	7 (25.93)
Negative	20 (74.07)
Nerve invasion, no. (%)
Positive	17 (62.96)
Negative	10 (37.04)
Vascular invasion, no. (%)
Positive	10 (37.04)
Negative	17 (62.96)
Differentiation, no. (%)
Moderately-poor	15 (55.56)
High	12 (44.44)
Tumor size, no. (%)
>4 cm	12 (44.44)
≤4 cm	15 (55.56)