Hello Sharon and congratulations on your husband's successful resection! Some doctors will say when they have completed surgery and had clean margins that the cancer is "gone." No one can truly say that cancer is cured because it can be microscopic, but at different points you can be cancer free and that may hopefully be forever.
I chose to have chemo after successful Whipple surgery for extrahepatic cc. I did not do radiation. This is all such a personal decision for each one of us to make. I wanted to do the chemo even tho they couldn't tell me it did anything because they told me it was very "tolerable chemo: and I wanted to do the things I could. I didn't do radiation for personal reasons that I won't go into here.
My best advice is to get all the information you can, read what you can, and make your decision. Once your decision is made, don't second guess yourself because it will do no good and will only cause you distress.
Best wishes for you and your husband and whatever decisions you make are the right ones for you.