I read your post from a few weeks ago regarding having biopsies that did not produce cancerous cells. This also happened to me. I had two biopsies. One by EUS and one by FNB/CT - after seven passes they did find something they identified as cancer/adenocarcinoma. It was always a questions in my mind. Anyway, there were treating me as if it was cancer and needed the cells to decide which chemo to put me on. It is not uncommon to not be able to reach the cells, so with pancreatic cancer it is best to be aggressive and that is what it sounds like your doctors are being.
Good luck, sounds like they got yours early!
Kikivero