breast cancer risks

Between 5 and 10% of all breast cancers are thought to be hereditary. This means that most breast cancers (9 out of 10) happen sporadically or spontaneously, ie without a family history. Breast cancer is a common cancer – about 1 in 10 women in the UK will get it during their lifetime (around 10%). So if you have just one or even two elderly relatives diagnosed with breast cancer, it does not mean that you are at much increased risk yourself.

read more at http://www.cancerbackup.org.uk/Aboutcancer/Genetics/Cancergenetics/Breastovariancancer