Study of Safety and Tolerability of PCI-27483 in Patients With Pancreatic Cancer Patients Receiving Treatment With Gemcitabine

"Part A: Closed to enrollment.Part B: Approximately 20 patients will be randomized to the control arm that will receive a standard regimen of gemcitabine and 20 patients will be randomized to the PCI-27483 arm and treated with both gemcitabine and PCI-27483. PCI-27483 will be administered as subcutaneous (SC) injections, nominally at a dosage of 1.2 mg/kg BID. Patients receiving PCI-27483 with a tumor response or stable disease at 12 weeks will have the option to continue PCI-27483 treatment until disease progression or the investigator considers the study treatment no longer tolerable. Treatment with gemcitabine may continue per standard of care.~All evaluable patients will roll over into Part C at week 16 (Day 113±5). If 2 consecutive INRs at 2 hours postdose are \>3.50,a reduced dosage will be calculated."