My situation was similar in that I had a 2.0cm tumor located in the tail of the pancreas. I had a distal panreatectomy/splenectomy (laproscopic/robotic) on May 17. Less than three weeks after consultation with the surgical oncologist. A biopsy done in early April was inconclusive and the recommendation was to proceed with surgery as a second biopsy might also be inconclusive. Patholgy following surgery concluded localized metastatic adenocarcinoma. 6/26 lymph nodes were positive. Four of the six nodes involved via direct extension. Margins were clean. I started my first of 8 cycles of Oxaliplatin/irinotecan/5Fu on June 13. After my first 4 cycles scans and blood work indicate "no evidince of cancer present". My CA19-9 prior to surgery was 53, two weeks post surgery 15, after 4th chemo cycle 7. As you have indicated there is likely microscopic disease somewhere which is why I'll continue with the remaining course of chemo to be followed by 28 days of radiation. Good luck to your husband on his journey. It's a long and challenging road. Four months ago I was feeling bleak. Today I at least feel like there is hope.