What are the chances for remission?

My husband was diagnosed with esophageal and stomach cancer as a result of acid reflux which he had no idea he had. One day he was eating a sandwich (in February 2009) which got stuck in his throat and couldn't swallow so one thing lead to another. He is now on chemo and radiation daily (5 days) and the doctors say he might have a chance of going into remission. What is your opinion?