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To investigate whether the presence of rare HRAS1 alleles increases susceptibility to hereditary breast and ovarian cancer , we have typed a panel of 307 female BRCA1 carriers at this locus using a PCR - based technique .
 Disease: hereditary breast and 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: hereditary breast and ovarian cancer