Two of these antibodies , cetuximab ( Erbitux ) und bevacizumab ( Avastin ) , directed against the epidermal growth factor receptor ( EGFR ) and the vascular epithelial growth factor ( VEGF ) , respectively , have recently been approved for use in metastatic colorectal cancer .
[Antibody treatment in colorectal cancer--what the surgeon needs to know]. Advances in the medical treatment of colorectal cancer patients have resulted in considerable improvements through the introduction of new cytotoxic drugs. The significant progress in molecular and tumour biology has produced a great number of targeted, tumour-specific, monoclonal antibodies that are now in various stages of clinical development. Two of these antibodies , cetuximab ( Erbitux ) und bevacizumab ( Avastin ) , directed against the epidermal growth factor receptor ( EGFR ) and the vascular epithelial growth factor ( VEGF ) , respectively , have recently been approved for use in metastatic colorectal cancer . The combination of well-known and newly developed cytotoxic agents with monoclonal antibodies makes the medical treatment of colorectal cancer patients considerably more complex, but also provides additional therapeutic strategies for patients in advanced stages of disease.
### Instruction:
            Given the context about compound efficacy for the given treatment mentioned within the input, mentioned the compounds 
            that can co-occur for the mentioned treatment

            ### Input:
            [Antibody treatment in colorectal cancer--what the surgeon needs to know]. Advances in the medical treatment of colorectal cancer patients have resulted in considerable improvements through the introduction of new cytotoxic drugs. The significant progress in molecular and tumour biology has produced a great number of targeted, tumour-specific, monoclonal antibodies that are now in various stages of clinical development. Two of these antibodies , cetuximab ( Erbitux ) und bevacizumab ( Avastin ) , directed against the epidermal growth factor receptor ( EGFR ) and the vascular epithelial growth factor ( VEGF ) , respectively , have recently been approved for use in metastatic colorectal cancer . The combination of well-known and newly developed cytotoxic agents with monoclonal antibodies makes the medical treatment of colorectal cancer patients considerably more complex, but also provides additional therapeutic strategies for patients in advanced stages of disease.

            ### Response:
            cetuximab, bevacizumab
            