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Further , we used this model to test the efficacy of GDC - 0941 , a PI3K inhibitor , in clinical development , and showed that the tumors respond to PI3K inhibition .
 Chemical: GDC - 0941
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: GDC - 0941