Welcome to the site and to this wonderful community but sorry you had a reason to join us. You will get lots of support and information here from people who have had real experience as both patients and caretakers. The information you find on the web is often inaccurate and frightening and my experience has been that this cancer is difficult to predict because of the small number of people who get it compared to other cancers.
I am a 3.5 year survivor of stage 2b extrahepatic cc. I had surgery and a 6 month round of adjuvant chemotherapy (Gemzar), which while no picnic, was not horrible. I had a stent placed before the surgery and it really helped with the symptoms (itching, yellow skin, etc.).
If you post more information about your dad's specific situation, I am sure you will get some answers to your questions.
Please keep us posted.
Survivor of breast cancer (1994), thyroid cancer (1999), cholangiocarcinoma (2009).
My comments, suggestions, and opinions are based only on my personal experience as a cancer survivor. Please consult a physician for professional guidance.