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The major classes of commonly prescribed lipid - lowering medications , such as statins , increase serum PCSK9 levels , thus PCSK9 inhibition would increase the efficacy of statins on LDL - C lowering .
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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:
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