14355
Repeated systemic administration of the selected surface modified HK : siRNA nanoplexes targeting Raf - 1 showed 35 % greater inhibition of tumor growth than unmodified HK : siRNA nanoplexes and 60 % greater inhibition of tumor growth than untreated mice .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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