25523
In particular , triple negative breast cancers ( TNBCs ) , which do not express the genes for estrogen / progesterone receptors ( ER / PR ) and human epidermal growth factor receptor 2 ( HER2 ) , have been associated with poor prognosis and metastasis .
 Chemical: estrogen; Chemical: progesterone
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; Chemical: progesterone