“…In most studies, a large number of agents, including 5-fluorouracil (5-FU), mitomycin C, cisplatin, methotrexate, etoposide, doxorubicin, nitrosoureas, paclitaxel and irinotecan, have been tested as a single-agent or combination therapy, and have been reported to have response rates varying from 20 to 30% [5]. Among several different new anticancer drugs currently being investigated in the treatment of inoperable biliary tract cancer, gemcitabine has generated particular interest [1, 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]. Apart from its favorable toxicity profile, this novel nucleoside analog has shown activity in many solid tumors, including pancreatic adenocarcinoma [6, 25, 26].…”