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Metastatic colorectal cancer ( mCRC ) is frequently characterized by the presence of mutations of the KRAS oncogene , which are generally associated with a poor response to treatment with anti - epidermal growth factor receptor ( anti - EGFR ) monoclonal antibodies .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None