Table 3.

The 5-year OS, LC, and DMFS rates for cN0 cases for each patient characteristic

Characteristic		5-year OS rate (%)		5-year LC rate		5-year DMFS rate
	No. (%)		p value		p value		p value
Age (years)
≥ 70 years	23 (61)	47	0.14	78	0.39	48	0.31
< 70 years	15 (39)	58		54		64
Male	32 (84)	48	0.7	67	0.61	50	0.19
Female	6 (16)	67		67		83
ECOG PS
0	29 (76)	55	0.08	67	1	56	< 0.01
1	8 (21)	47		69		28
≥ 2	1 (3)	–		–		–
T factor
3	5 (13)	60	0.4	80	0.31	80	0.78
4a	15 (39)	40		51		45
4b	18 (48)	60		77		57
Direction of tumor invasion medial site
Yes	37 (97)	50	0.78	66	0.53	56	0.5
No	1 (3)	100		100		–
Lateral site
Yes	30 (79)	52	0.81	62	0.28	56	0.47
No	8 (21)	50		86		50
Cranial site
Yes	37 (97)	50	0.42	66	0.53	50	0.44
No	1 (3)	–		–		–
Caudal site
Yes	21 (55)	35	0.04	60	0.35	42	0.27
No	17 (45)	70		74		70
Anterior site
Yes	33 (87)	47	0.2	67	0.58	54	0.94
No	5 (13)	80		75		60
Posterior site (pterygoid plates)
Yes	20 (53)	37	0.04	67	0.68	43	0.37
No	18 (47)	66		68		66
Nasopharynx
Yes	2 (5)	50	0.6	100	0.52	50	0.79
No	36 (95)	51		66		55
Posterior wall+
Yes	33 (85)	50	0.8	65	0.84	54	0.96
No	5 (15)	60		80		60