659
Formation of irradiation - induced foci positive for BRCA1 , hRad50 , hMre11 , or p95 was dramatically reduced in HCC / 1937 breast cancer cells carrying a homozygous mutation in BRCA1 but was restored by transfection of wild - type BRCA1 .
 breast cancer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 breast cancer