11319
Identification of sequence alterations in the upstream regulatory region of the estrogen receptor gene in an ER-negative breast cancer cell line .
 upstream regulatory region, ER-negative breast cancer cell line, estrogen receptor gene
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:
 upstream regulatory region, ER-negative breast cancer cell line, estrogen receptor gene