- For Stages 1 and 2 of the study, histologically documented unresectable primary or metastatic carcinoma of the pancreas, Stage II-IV, diagnosed within the past 8 weeks, intended to be treated with Gemcitabine as a single agent at 1000 mg/m^2 once weekly for 3 weeks repeating the cycle every 4 weeks. For Stage 1 but not Stage 2 of the study, patients also include those with histologically documented unresectable primary or metastatic carcinoma other than pancreatic carcinoma (e.g., bladder cancer, NSCLC, and biliary tract cancer) who are intended to be treated with Gemcitabine as a single agent at 1000 mg/m^2 once weekly for 3 weeks repeating the cycle every 4 weeks, regardless if Gemcitabine is used as second, third or fourth line treatment.