3073
Biomarkers included DNA ploidy , estrogen receptor ( ER ), and epidermal growth factor receptor ( EGFR ).
 epidermal growth factor receptor, estrogen receptor, ER, EGFR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 epidermal growth factor receptor, estrogen receptor, ER, EGFR