Table 1. Patients, tumor and treatment characteristics.

	Characteristic	No. of patients	Percentage (%)
Age (years old)	Median	50
	<65	353	94.6
	≥65	20	5.4
Histology	Squamous cell carcinoma	336	90.1
	Adenocarcinoma	28	7.5
	Adenosquamous carcinoma	6	1.6
	Undifferentiated carcinoma	2	0.5
	Neuroendocrine carcinoma	1	0.3
Lymph nodes metastasis	Regional lymph nodes metastasis	92	24.7
	Pelvic lymph nodes metastasis	91	24.4
	Para-aortic lymph nodes metastasis	18	4.8
EBRT technique	FF-IMRT	124	33.2
	VMAT	232	62.2
	HT	17	4.6
Extended field irradiation	Yes	52	13.9
	No	321	86.1
Concurrent chemotherapy	Cisplatin	346	92.8
	Paclitaxel	27	7.2
Concurrent chemotherapy	≥4 cycles	318	85.3
	<4 cycles	55	14.7
Dose of intracavitary brachytherapy	≤30 Gy	30	8.0
	30–36 Gy	291	78.0
	>36 Gy	52	13.9

EBRT indicates external beam radiation therapy; FF-IMRT, fixed field intensity modulated radiation therapy; VMAT, volumetric modulated arc therapy; HT, helical tomotherapy.