Table 1

Eligible female first-degree relatives of consenting Washington Ashkenazi Study probands

Proband typeRelatives of probands with complete data in Washington Ashkenazi Study
MothersSistersDaughters >age 20Half-sisters
Breast cancer case without BRCA1/2 founder mutations (n = 231)
 Number of relatives22717318616
 Percentage with breast cancer (n)21 (48)13 (23)2 (3)25 (4)
BRCA1/2 founder mutation carrier (n = 114)
 Number of relatives11492511
 Percentage with breast cancer (n)36 (41)18 (17)2 (1)0 (0)