I live in Fort Collins and was diagnosed with cholangiocarcinoma in December 08. The doctors at the University of Colorado Anschuz Cancer Center are the ones you want to see. I saw Dr Colin Weekes who is a medical oncologist. They also have some clinical trials going on for cholangiocarcinoma at the University of Colorado. I am currently doing treatment in Fort Collins, but have to go down to University of Colorado to get my stents replaced every 3 months. Good Luck. Let me know if there are any other questions you may have.
http://www.uccc.info/conditions/cancer/index1.aspx