Table 1.

Characteristics of the included trials comparing postoperative chemoradiotherapy and postoperative chemotherapy.

First author	Country	Year published	Total accrual, n	Clinical target volume delineation
Lee 18	Korea	2012	458	tumor bed, anastomosis site, duodenal stump, regional lymph node, and 2 cm beyond the proximal and distal margins of resection
Zhu 20	China	2012	351	ICRU 50 report
Kim 21	Korea	2012	90	anastomosis site, duodenal stump, regional lymph nodes, and more than 2 cm from the proximal and distal margins of resection
Yu 22	China	2012	68	tumor bed, stroma, and regional lymph node
Kwon 26	Korea	2010	61	tumor bed, anastomosis, stump, and regional lymph node areas
Bamias 27	Greece	2010	143	tumor bed, anastomosis, the stomach remnant, and regional lymph nodes
Kilic 28	Turkey	2013	71	tumor bed, anastomosis, and regional lymph nodes