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We propose that STAT3 has a central role in the survival and contributes to chemoresistance of B - RAF ( V600E ) melanoma . Oncogene advance online publication , 4 March 2013 ; doi : 10 . 1038 / onc . 2013 . 45 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None