Promising treatment outcomes of intensity-modulated radiation therapy for nasopharyngeal carcinoma patients with N0 disease according to the seventh edition of the AJCC staging system

Table 3 Five-year survival rates for N0 nasopharyngeal carcinoma patients according to different T-classifications of the seventh edition of AJCC staging system

Stage	Death		Local recurrence		Distant metastasis
	Event/N	5-year OS (%)	Event/N	5-year LRFS (%)	Event/N	5-year DMFS (%)
T1N0	1/60	97.8	0/60	100	2/60	96.6
T2N0	0/16	100	1/16	92.9	1/16	90.9
T3N0	1/16	93.8	0/16	100	0/16	100
T4N0	4/18	76.9	2/18	88.9	1/18	93.3

OS, overall survival; LRFS, local relapse-free survival; DMFS, distant metastasis-free survival

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