TABLE 3.

Chi‐square test compared the clinicopathological characteristics of the patients with different risk levels

	Risk		p value
	Low (N = 171)	High (N = 171)
Age			0.825
<65 years old	101	104
>=65 years old	70	67
Gender			0.164
Female	48	61
Male	123	110
Histological grade			<0.001***
G1	38	15
G2	88	73
G3	40	71
G4	3	9
AJCC TNM stage			<0.001***
Stage I	101	60
Stage II	31	46
Stage III	28	52
Stage IV	2	1
T stage			<0.001***
T1	105	63
T2	31	53
T3	28	46
T4	4	9
N stage
N0	116	123
N1	0	3
M stage			0.607
M0	116	128
M1	2	1

Abbreviations: AJCC, American Joint Committee on Cancer; G1, high differentiation; G2, medium differentiation; G3, low differentiation; G4, undifferentiated.

*p < 0.05, **p < 0.01, ***p < 0.001.