Fig. 1.

Cumulative risk by age in all cases with familial breast cancer without a demonstrable mutation (Total_series), in women with four or more affected relatives (four cases in family), in women with two or more affected relatives = <55 years (two cases ≤55), in women with both breast and ovarian cancer in the family (ovarian cancer in family), in women where the only affected relative was the mother or one sister = <50 years (one young case ≤50 only in family), and in population (cancer registry as controls)