If you are found to be eligible to take part in this study, you will be assigned to a dose level of a combination of nab-paclitaxel, gemcitabine, and bevacizumab based on when you joined this study. All participants will receive the same dose level of gemcitabine. However, the first group of participants will receive the lowest dose level of nab-paclitaxel and bevacizumab. Each new group will receive a higher dose for one of the drugs than the group before it, if no intolerable side effects were seen. The other drug may be at the same dose or a lower dose. This will continue until the highest tolerable dose of combination of nab-paclitaxel, gemcitabine, and bevacizumab is found. Up to 15 dose levels of the study drug combination will be tested. Three (3) to 4 participants will be enrolled at each dose level.