17145
Within this context , the Hedgehog ( Hh ) pathway has been implicated in several types of human tumors , and early clinical trials with Hh antagonists have validated Hh as a novel therapeutic target .
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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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