4600
The two basic mainstays of gastrointestinal stromal tumours ( GIST ) treatment are surgery and imatinib , a selective tyrosine kinase inhibitor that allows achieving a stable or responding disease in about 80 % of patients with unresectable / metastatic GIST .
 Chemical: imatinib; Chemical: tyrosine
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: tyrosine