9214
In addition , the issue arises of whether these mCRC cases with low proportion of KRAS - mutated cells could account at least in part for the therapeutic failure of anti - EGFR therapies that occur in 40 - 60 % of cases classified as KRAS wild type .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None