management of esophageal cancer depends on location of of the tumor. Generally upper third of esophagus
cancer mainly managed by chemoradiotherapy
whereas lower and middle third of esophagus cancer managed by surgery followed by chemoradiation if on biopsy
report surgical margin are found to be involved. From your question it is unclear whether your brother was offered post-op chemoradiation or not. If post op chemoradiation was given then chance of anastomotic dehiscence is increased. Now in case of your brother as blockage or twist in the tube from his stomach to intestine has occured it is better to think of putting a feeding tube
directly to intestine (jejunum) by operative intervention and to put the patient in close follow up. You have to consult your surgical oncologist
. Take care of your brother.