Optimized Chemotherapy Followed by Maintenance With Bevacizumab With or Without Erlotinib in Treating Patients With Metastatic Colorectal Cancer That Cannot be Removed by Surgery (DREAM)

PURPOSE: This randomized phase III trial is studying maintenance therapy with bevacizumab alone after an induction therapy combining bevacizumab+chemotherapy to see how well they work compared to maintenance therapy with bevacizumab+erlotinib alone after an induction therapy combining bevacizumab+chemotherapy in treating patients with metastatic colorectal cancer that cannot be removed by surgery.