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Nevertheless , current evidence suggests that everolimus plus exemestane combination therapy may be a useful treatment option in patients with postmenopausal hormone receptor - positive , HER2 - negative , advanced breast cancer refractory to nonsteroidal AIs .
 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