Table 1

 Proportion of unaffected female first degree relatives of BRCA1/2 mutation carriers testing positive for the family mutation

Age at testingTesting positiveTesting negativeUntestedProportion positiveProportion tested
These results include four mutation carriers and two non-carriers who have subsequently developed breast or ovarian cancer and exclude seven tested females over 60 years of age who had an affected daughter with breast/ovarian cancer who had tested positive.
18–2916188547%29%
30–3964465858%65%
40–4937504543%66%
50–5916255239%44%
60+127314%47%
Total13416618645%52%