7659
In this study , we examined the effect ( s ) of 4 - tert - octylphenol ( OP ) , a potent EDC , on the expression of cathepsins B and D in human MCF - 7 breast cancer cells and a xenograft mouse model .
 Chemical: 4 - tert - octylphenol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 4 - tert - octylphenol