Table 2. Assessment of the clinicopathological factors by the log-rank test.

Parameter	DFS (%)	p-value	DSS (%)	p-value	OS (%)	p-value
Age (years)		0.847		0.764		0.545
≤60	54		62		62
>60	52		59		52
Gender		0.677		0.713		0.025*
Male	52		60		57
Female	100		100		0
Smoking status		0.384		0.248		0.403
None smoker	71		75		70
Past smoker	51		54		52
Current smoker	45		45		45
Alcohol consumption		0.170		0.151		0.278
None drinker	66		72		66
Moderate drinker	37		37		37
Heavy drinker	43		55		52
Primary tumor site		0.003*		0.049*		0.050*
Pyriform sinus	60		69		67
Posterior pharyngeal wall	46		43		39
Postcricoid region	0		0		0
T classification		0.124		0.335		0.133
T1/T2	65		66		66
T3/T4	40		52		48
Cervical metastasis		0.005*		0.024*		0.026
Yes	40		52		48
No	83		82		82
Postoperative irradiation		0.082		0.153		0.168
Yes	45		54		52
No	72		72		66
Margin involvement		0.201		0.344		0.503
Yes	37		48		46
No	60		65		60
Histologic differentiation		0.986		0.633		0.535
Well	57		65		65
Moderately	45		57		46
Poorly	39		42		42
Lymphovascular invasion		0.279		0.470		0.420
Yes	46		54		51
No	66		68		68
Extracapsular spread		0.001*		0.003*		0.004*
Yes	29		43		42
No	76		77		74
High risk HPV status		0.026*		0.047*		0.324
Positive	100		100		83
Negative	46		54		52

DFS, disease-free survival; DSS, disease-specific survival; OS, overall survival.

^*p<0.05.