259
To begin to address the hypothesis that abnormal regulation of the breast / ovarian cancer susceptibility gene BRCA1 is a critical step in sporadic breast / ovarian tumorigenesis , we have determined the detailed structure of the BRCA1 genomic region .
 Disease: breast / ovarian cancer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: breast / ovarian cancer