Hi there, my name is Michelle and my Dad also has Ampullary Cancer. First - see what the diagnosis is and then GET A SECOND OPINION!!!!! Even a third...Go to oncologists who have seen this kind of cancer before! Get the most experienced one in your area - don't be pressured to just stick with that doctor and rush into surgery/treatment... Yes, be diligent, but don't be uninformed.
We have yet to find ANY clinical trials for Ampullary (as the primary) Cancer. It is rare and usually is so advanced when discovered that it's considered Pancreatic.
My father had a "Whipple" procedure 6 years ago. It's metasticized now and he's into heavy chemotherapy fighting a good fight.
My prayers go out to you and your family. The best advise I can give (mother's an RN) get the BEST in your area. Don't trust just because they're nice or they said they're the best in the area... You can help by researching extensively for him - that's what I do for my Dad.
Also, look to God for strength and say everything you want to say to your Dad. Live with no regrets. God Bless,
Michelle