Has anyone had ampullary cancer and had the Whipple Procedure?

I was diagnosed with ampullary cancer as I had a blockage to my bile duct and had the Whipple Procedure which I am recuperating from and it has been 6 weeks recovery this week. Luckily the mass (stage 2) was taken out and it did not go beyond the margins and my 16 lymph nodes are fine. So technically at this point I am cancer free or in remission. I was referred to a cancer specialist to talk about preventative cancer which would be a 6month aggressive chemo and radiation treatments. If I have the treatment I asked what would be the recurrence factor and the doctor says 50/50. I also add that there is no real data for patients with this cancer as my doctor told me as it is a rare cancer but not uncommon. Please let me know if you have any insights regarding this type of cancer and your thoughts would be appreciated. Thank you!