26161
It was found that the risk of E - cadherin hypermethylation was 1 . 347 - fold , while risk of p15 hypermethylation was 1 . 543 - fold and p16 was 1 . 2 - fold among patients with ovarian cancer than that among patients with benign ovarian lesions .
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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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