10391
Estrogen receptor ( ER ) expression is the main indicator of potential responses to endocrine therapy ( ET ) , and approximately 70 % of human breast cancers ( BCs ) are hormone - dependent and ER - positive .
 Chemical: Estrogen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Estrogen