I am a patient of this disease for four and half years since diagnosis and I had 3 resections and other procedures to extend my quality of life.
Recurrence is always in my mind since day one for there is NO cure for this disease. As you know by now , even after resection or transplant will not guarantee the NO return of CCA ;for the literature always use the word of "POSSIBLE" cure instead of CURE. My personal point of view is that biologically, if the liver cells can regenerate itself,so does the CCA cells in the liver and the bile ducts , even just one CCA cell left after surgery ( both originated from hepatocyte).And only a few of us are so lucky to pass the 10 year mark or the 15year mark without recurrence. But I always thank God for His Grace for the extra time He gives me no matter how many months or years left.
Compare to intrahepatic CCA ( which I have),and your husband's distal CCA, the chance of recurrence for your husband is much lesser than mine.(<50% vs50-75%). I do not think your husband needs chemotherapy before surgery based on your description above since the tumor is small.However on many other occasions chemotherapy are often administer as neoadjuvant chemotherapy to shrink the large tumor before surgery.I hope to above info give you some answers to your question.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.