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In the well - designed BOLERO - 2 study , the addition of everolimus to exemestane was shown to significantly prolong progression - free survival in this patient population .
 Chemical: everolimus; Chemical: exemestane
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: everolimus; Chemical: exemestane