Clinical Outcomes and Prognostic Factors of 695 Nasopharyngeal Carcinoma Patients Treated with Intensity-Modulated Radiotherapy

Table 2

Dose-volume statistics for targets (average result).

				Fractional dose	(%)
GTVnx	78.24	66.37	72.62	2.25	99.4
GTVln-L/R	71.43	60.59	68.14	2.10	99.6
CTV1	68.77	61.27	65.21	1.94	99.4
CTV2	64.36	55.96	58.87	1.88	99.3
CTVln	54.19	50.04	51.42	1.82	99.3

GTVnx: gross target volume; GTVln-L/R: positive neck lymph nodes; CTV1: high-risk region of clinical tumor volume; CTV2: low- risk region of clinical tumor volume; CTVln: lymph node region of clinical tumor volume; : percentage of volume receiving 95% of prescribed dose.