Hydroxychloroquine, Capecitabine, Oxaliplatin, and Bevacizumab in Treating Patients With Metastatic Colorectal Cancer

RATIONALE: Drugs used in chemotherapy, such as capecitabine and oxaliplatin, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Monoclonal antibodies, such as bevacizumab, can block tumor growth in different ways. Some block the ability of tumor cells to grow and spread. Others find tumor cells and help kill them or carry tumor-killing substances to them. Bevacizumab may also stop the growth of tumor cells by blocking blood flow to the tumor. Hydroxychloroquine may help chemotherapy and bevacizumab work better and kill more tumor cells. PURPOSE: This phase II trial is studying how well giving hydroxychloroquine together with capecitabine, oxaliplatin, and bevacizumab works in treating patients with metastatic colorectal cancer.