Table 3.

The irradiation volumes of studies enrolled.

Study	The irradiation volumes (CTV)
Cao MF 2019 (11)	–
Jiang Y 2019 (12)	–
He ZR 2017 (13)	➢ Tumors of the proximal third of the stomach or cardiac esophagogastric junction: primary tumor, 3–5 cm of the lower esophagus, the left hemidiaphragm, and the adjacent pancreatic body, with high-risk lymph node areas including the adjacent peri-e,sophageal, perigastric, suprapancreatic, celiac trunk, splenic artery and splenic hilar lymph node areas. ➢ Tumors of the middle third of the stomach or the body of the stomach: primary tumor and the pancreatic body, with the lymph node area including the adjacent perigastric, suprapancreatic, truncal and splenic hilar, hepatic, and duodenal lymph node areas. ➢ Tumors of the distal third of the stomach: if the gastroduodenal junction is involved: primary tumor, the head of the pancreas, the first and second segments of the duodenum, with the lymph node area including the perigastric, suprapancreatic, celiac trunk, hilar, and pancreaticoduodenal lymph nodes.
T.Leong 2017 (14)	➢ The entire stomach, any perigastric tumor extension, and regional lymph nodes.
M.Stahl 2017 (15, 16)	➢ The pretherapeutic extension of the primary tumor with a transversal margin of 2 cm and a both- sides longitudinal margin along the mucosa of the gastro-oesophageal junction (GEJ) of 5 cm in Siewert type 1 tumors. ➢ Suspicious lymph nodes with a 1-cm margin and the regional lymph nodes with a margin of 1.5 cm around the cardia, along the left gastric artery and the minor curvature to the incisura angularis, the celiac artery, the proximal part of the commune hepatic artery, and along the first 2 cm of the splenic artery.
Zhang XT 2016 (17)	–
X.Wang 2016 (18)	–