STA-9090 in Previously Treated Patients With Advanced Esophagogastric Cancer

In this research study, the investigators are looking to see how effective STA-9090 is in treating esophagogastric cancer. The investigators will also evaluate the side effects of STA-9090, and examine the relationship between the presence of HSP-90 and how well study participants respond to STA-9090. STA-9090 works by blocking a protein in tumor cells called HSP90, which is thought to play a role in tumor growth. By interfering with this protein's function, STA-9090 may help kill tumor cells. This drug has been used in other research studies and information from those other research studies suggests that this agent may help to slow tumor growth in esophagogastric cancer.