4604
We investigated a panel of 31 polymorphisms in 11 genes , potentially associated with the pharmacogenetics of imatinib , in a group of 54 unresectable / metastatic GISTs treated with imatinib 400mg daily as first line therapy .
 Chemical: imatinib; Chemical: imatinib
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: imatinib; Chemical: imatinib