Failure patterns of locoregional recurrence after reducing target volumes in patients with nasopharyngeal carcinoma receiving adaptive replanning during intensity-modulated radiotherapy: a single-center experience in China

Table 4 Details of recurrent patients receiving IMRT with replanning and their failure patterns

No.	Sex	Age (y)	Stage	Site of recurrence	Location of recurrence	V95%	Type of recurrence
43	Male	44	T3N0	Local	GTVnx	97.7	In-field
57	Male	50	T1N0	Local	GTVnx	96.1	In-field
61	Female	34	T3N2	Local	GTVnx	95.9	In-field
96	Male	50	T3N2	Local	Outside GTVnx	10.01	Out-field
				Regional	CTV2	100.0	In-field
100	Male	60	T3N2	Local	GTVnx	97.1	In-filed
130	Female	72	T4N0	Local	GTVnx	97.5	In-filed
162	Male	59	T3N1	Local	GTVnx	99.8	In-filed
186	Male	47	T2N1	Regional	CTV1	98.68	In-field
191	Male	37	T2N2	Local	GTVnx	96.8	In-field
				Regional	CTV1	100.0	In-field
194	Male	55	T4N0	Local	GTVnx	99.2	In-field
200	Male	49	T4N2	Local	GTVnx	96.8	In-field
202	Female	43	T2N2	Regional	GTVnd	99.3	In-field
208	Female	72	T4N3	Local	GTVnx	97.1	In-field
214	Male	60	T4N2	Local	GTVnx	99.5	In-field
256	Male	66	T2N2	Regional	GTVnd	100.0	In-field

IMRT = Intensity modulated radiation therapy. GTVnx = Gross tumor volume of primary tumor. GTVnd = Gross tumor volume of neck lymph nodes. CTV1 = Clinical tumor volume of the high-risk region. CTV2 = Clinical tumor volume of the low-risk region. V95% = The percentage of the target volume covered by the 95% prescribed dose line

ISSN: 1748-717X