TABLE 2

Multivariable Analysis of 5-Year Control and Survival Rates in PET Group (n = 136)

	Local control		Neck control		Distant metastasis		DFS		DSS		OS
Risk factor (n)	P	HR (95% CI)	P	HR (95% CI)	P	HR (95% CI)	P	HR (95% CI)	P	HR (95% CI)	P	HR (95% CI)
Extracapsular spread (+) (n = 44)	NS	—	0.003	6.2 (1.8–21.2)	0.001	4.3 (1.8–10.3)	0.001	3.8 (1.7–8.4)	0.001	4.8 (1.9–11.8)	0.003	2.1(1.4–6.5)
Lymphatic invasion (n = 8)	NS	—	0.002	6.7 (2.0–22.8)	<0.001	7.5 (2.6–21.3)	0.001	5.7 (2.1–15.4)	<0.001	7.3 (2.6–20.7)	<0.001	5.6 (2.2–14.3)
Margin status ≤ 4 mm (n = 28)	NS	—	NS	—	NS	—	0.024	2.6 (1.1–6.0)	NS	—	NS	—

DFS = disease free survival; DSS = disease specific survival; OS = overall survival; HR = hazard ratio; CI = confidence interval; NS = not significant.