Stage 0 In stage 0 (carcinoma in situ), abnormal cells are found in the innermost layer of tissue lining the extrahepatic bile duct. These abnormal cells may become cancer and spread. Stage I-A Cancer is found in the bile duct only.. Stage I-B Cancer has spread through the wall of the bile duct.. Stage II-A Cancer has spread to the liver, gallbladder, pancreas, and/or to either the right or ....