Table 2.

Summary of questionnaire survey of 18 cancer centers^✝

Question	Answers	N/18	(%)
The selection of radiation field	IFI	15	83.33
	ENI	0	0.00
	Others	3	16.67
How many centimeters does GTVp expand to form CTVp radially and cranio-caudally?	0.5 cm, 3.0 cm	6	33.33
	0.6 cm, 3.0 cm	1	5.56
	0.8 cm, 3.0 cm	2	11.11
	0.5–0.7 cm, 2.0 cm	1	5.56
	0.5 cm, 2.0–3.0 cm	1	5.56
	0.5 cm, 2.0 cm	7	38.89
	Others	0	0
How many centimeters does GTVn expand to form CTVn in all directions?	0.3 cm	1	5.56
	0.3–0.5 cm	1	5.56
	0.5 cm	11	61.11
	0.6 cm	4	22.22
	Others	1	5.56
How many centimeters does CTV expand to form PTV?	0.3–0.5 cm	1	5.56
	0.5 cm	11	61.11
	0.6 cm	3	16.67
	0.8 cm	1	5.56
Is neoadjuvant therapy feasible for supraclavicular lymph node metastasis?	Yes	10	55.56
	No	8	44.44
Whether to accept surgical anastomosis in the radiation field?	Yes	14	77.78
	No	4	22.22

18 cancer centers✝: Shanghai Chest Hospital, Shandong Cancer Hospital, The Fourth Hospital of Hebei Medical University, Anyang Cancer Hospital, Tianjin Medical University Cancer Institute and Hospital, Jiangsu Cancer Hospital, Sun Yat-sen University Cancer Center, Sichuan Cancer Hospital, Henan Cancer Hospital, Henan Province People’s Hospital, West China Hospital of Sichuan University, The First Affiliated Hospital of Soochow University, Xinjiang Cancer Hospital, Xijing Hospital, Fujian Medical University Union Hospital, Cancer Hospital of the Chinese Academy of Medical Sciences, Shanxi Cancer Hospital, Beijing Cancer Hospital

Abbreviations: IFI involved field irradiation, ENI elective nodal irradiation, GTVp gross tumor volume of the primary tumor, GTVn gross tumor volume of the lymph nodes, CTV clinical target volume, CTVp clinical target volume of the primary tumor, CTVn clinical target volume of the lymph nodes, PTV planning target volume