I re-posted this link in my previous thread but wasn't sure if you get notifications or not. Anyway, I know this is complex and not PBC specific however it talks about autoimmune's in general. The interesting part is how it mentions the different vitamins, probiotics and natural things such as cinnamon needed to up our T-Cells.
Anyway, I thought this was interesting and just another perspective on autoimmune disease as well as some others including cancer.