Risk perception was asked for the following eight items (the range that we considered accurate for subsequent analyses is given in parentheses): breast (8–14%) and ovarian cancer risk (1–3%) in the general female population, breast (60–85%) and ovarian cancer risk (15–60%) in BRCA1/2 mutation carriers, the possibility of cure when breast (65–80%) and ovarian cancer (35–50%) is detected during screening in BRCA1/2 mutation carriers, and residual risk after prophylactic surgery of breasts (3–12%) and ovaries (3–12%) in mutation carriers. The gene discussed is BRCA1; the disease is ovarian carcinoma.