Table 1. Characteristics of the TNM staging (n=155).

TNM staging	N (%)
Primary tumor (T)
1	36 (23.23)
2	66 (42.58)
3	18 (11.61)
4	33 (21.29)
x	2 (1.29)
Regional lymph nodes (N)
0	57 (36.77)
1	40 (25.81)
2	39 (25.16)
3	8 (5.16)
x	11 (7.10)
Distant metastasis (M)
0	109 (70.32)
1	27 (17.42)
2	4 (2.58)
3	1 (0.65)
x	14 (9.03)