The first 3 participants enrolled on this study will be given HuaChanSu and gemcitabine, to find out if this dose combination can be tolerated. After the first 3 participants are enrolled, all other participants will be randomly assigned (as in the toss of a coin) to receive HuaChanSu and gemcitabine or gemcitabine and the placebo. The first 20 participants have an equal chance of receiving HuaChanSu or placebo, but after that point, participants will have a better chance of being assigned to the group that is responding better to their study combination. All participants will receive the same dose level of gemcitabine, but you will not know if you are given HuaChanSu or placebo. However, this information can be found out if medically necessary.