26953
The identification of this subtype is crucial , as it has a very unfavorable prognosis and , moreover , is refractory to epidermal growth factor receptor - targeted therapy .
 None
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