Table 1.

Survival information of the patients by clinical characteristics n (%)

Parameter	Five year survival	P value
Age (yr)
< 55	38 (63.2)	0.225
≥ 55	57 (52.6)
Gender
Female	24 (54.2)	1.000
Male	71 (57.7)
Tumor size
≤ 3 cm	30 (56.7)	0.078
3-5 cm	49 (62.5)
> 5 cm	16 (37.5)
Differentiation grade
G1	23 (73.9)	0.060
G2	55 (58.2)
G3	17 (38.5)
Invasive depth
T1 + T2	24 (70.8)	0.169
T3 + T4	71 (52.1)
Regional lymph node metastasis
N0	57 (64.9)	0.034
N1	38 (44.7)
pTNM stage
IA +IB + IIA + IIB	61 (68.9)	0.007
IIIA + IIIB + IIIC + IV	29 (41.4)

Kaplan-Meier curves (log-rank test).