'Indirect' BRCA1/2 testing: a useful approach in hereditary breast and ovarian cancer families without a living affected relative.

Abstract excerpt

We report an approach for BRCA1/2 testing whereby genetic testing can be offered to families at high risk of hereditary breast and ovarian cancer but where no DNA from affected relatives is available. By testing two or more unaffected relatives at 50% risk of being heterozygous for a potential BRCA1/2 mutation, there is a chance of up to 99% of finding a mutation that would have been detectable in an affected...

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