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One phase III trial comparing sorafenib and temsirolimus in the post - sunitinib setting showed no difference in PFS , the primary endpoint , but did show a superior overall survival for sorafenib .
 Chemical: sorafenib; Chemical: temsirolimus; Chemical: sunitinib; Chemical: sorafenib
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: sorafenib; Chemical: temsirolimus; Chemical: sunitinib; Chemical: sorafenib