Imatinib Mesylate With or Without Bevacizumab in Treating Patients With Metastatic or Unresectable Gastrointestinal Stromal Tumor

Study Summary

This randomized phase III trial studies imatinib mesylate and bevacizumab to see how well they work compared to imatinib mesylate alone in treating patients with gastrointestinal stromal tumor that has spread to other parts of the body or cannot be removed by surgery. Imatinib mesylate may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Monoclonal antibodies, such as bevacizumab, may interfere with the ability of tumor cells to grow and spread. It is not yet known whether imatinib mesylate and bevacizumab are more effective than imatinib mesylate alone in treating gastrointestinal stromal tumor.

Primary Outcome

From date of registration (defined as date of randomization) to date of first observation of progressive disease, death due to any cause or symptomatic deterioration. Patients last known to be alive and progression free are censored at last date of contact. Progression is defined as one or more of the following: 20% increase in the sum of longest diameters of target measurable lesions over smallest sum observed (over baseline if no decrease during therapy), provided at least one target lesion do

Interventions

• OTHER Laboratory Biomarker Analysis
• BIOLOGICAL Bevacizumab
• OTHER Pharmacological Study
• DRUG Imatinib Mesylate