3433
However, compared to VD , their antiproliferative effect is up to 30-fold higher on human peripheral blood mononuclear cells and even up to 300-fold higher on human breast cancer MCF-7 cells .
 ( cell line: human breast cancer MCF-7 cells, None) , ( cell type: human peripheral blood mononuclear cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: human breast cancer MCF-7 cells, None) , ( cell type: human peripheral blood mononuclear cells, None) 