Yes,I think any kind of inflammation can raise the CA19-9 level.
Well, I don' t think on the chemotherapy side is that much different in terms of ICCor HCC now.
The key right now is to see whether the radioembolization can provide your mom a better quality of life as compare to chemotherapy in the future.
Good luck and
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.