Safety and Efficacy Study of Different Doses of 90Y-hPAM4 Combined With Gemcitabine in Pancreatic Cancer

Patients receive a 4-week treatment cycle with once-weekly 30-minute gemcitabine infusions beginning one week prior to the first 90Y-hPAM4dose and continuing during the 3 consecutive weeks over which once weekly 90Y-hPAM4 doses are given. Depending on toxicity, patient cohorts will receive one of several possible 90Y and gemcitabine dose combinations. Post-treatment evaluations conducted until instituting another 90YhPAM4 treatment cycle, maintenance gemcitabine or for a maximum period of 12 weeks.