br / > < iframe allowfullscreen="" frameborder="0" height="315" src="//www.youtube.com/embed/CuQKfCca8Ec" width="560" > < /iframe > < /div > < br / > < div style="text-align: left;" > The BRCA 1 and 2 gene mutations, and a handful of other (rarer) gene mutations, account for about 10% of all breast cancer cases. The abnormal genes affect about 1 in 400 people ..."> < br / > < iframe allowfullscreen="" frameborder="0" height="315" src="//www.youtube.com/embed/CuQKfCca8Ec" width="560" > < /iframe > < /div > < br / > < div style="text-align: left;" > The BRCA 1 and 2 gene mutations, and a handful of other (rarer) gene mutations, account for about 10% of all breast cancer cases. The abnormal genes affect about 1 in 400 people ..." /> < br / > < iframe allowfullscreen="" frameborder="0" height="315" src="//www.youtube.com/embed/CuQKfCca8Ec" width="560" > < /iframe > < /div > < br / > < div style="text-align: left;" > The BRCA 1 and 2 gene mutations, and a handful of other (rarer) gene mutations, account for about 10% of all breast cancer cases. The abnormal genes affect about 1 in 400 people ..." />