Before the study drug infusions begin, you will be fitted with a peripherally-inserted central catheter (PICC) by a specially trained nurse. A PICC is a tube that is inserted into a vein, either in your arm or under the collarbone, to make it easier to give you gemcitabine with or without HuaChanSu. This is an outpatient procedure. You will be given a separate consent form for the insertion of the PICC. It will explain the risks of the procedure and how to take care of the PICC. Your doses of gemcitabine and either HuaChanSu or a placebo (a saline [salt water] solution that looks like HuaChanSu but has no effects) will be given through the PICC while you are on this study.