In the radiotherapy group : irradiation field for the lesion in the upper esophageal cancer included the gross lesion , bilateral supraclavicular nodes and 4 cm of normal esophagus from lower margin of the gross disease ; for the esophageal cancer at the middle segment , it included the gross disease with 4 cm normal esophagus from both ends of the lesion ; for the lesion in the lower esophageal cancer , it included 4 cm of normal esophagus and the gross lesion as well as the draining gastric lymph nodes .
