 RATIONALE: Drugs used in chemotherapy, such as oxaliplatin and capecitabine, 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. Radiofrequency ablation uses a high-frequency, electric current to kill tumor cells. Giving chemotherapy and bevacizumab before surgery or radiofrequency ablation may make the tumor smaller and reduce the amount of normal tissue that needs to be removed. 