Online tool to guide decisions for BRCA1/2 mutation carriers

Area of Science:

• Oncology
• Genetics
• Decision Science

Background:

• Women with BRCA1/2 mutations face high breast and ovarian cancer risks.
• Management involves choosing between prophylactic surgeries and intensive screening.
• Personalized decision-making tools are needed to navigate complex choices.

Purpose of the Study:

• To model and compare the long-term outcomes of various risk-reducing strategies for BRCA1/2 mutation carriers.
• To develop a clinical decision tool to aid shared decision-making regarding cancer prevention.

Main Methods:

• A Monte Carlo simulation model was developed for BRCA1/2 mutation carriers.
• The model simulated annual mammography plus MRI screening and prophylactic mastectomy/oophorectomy at different ages.
• Outcomes included cancer incidence, tumor characteristics, survival, and mortality.

Main Results:

• Prophylactic oophorectomy plus mastectomy at age 25 significantly reduced cancer incidence (4-11%) and improved survival (80-83%) by age 70.
• Screening with MRI and prophylactic oophorectomy at age 40 showed less prevention but similar survival (74-80%).
• MRI screening often detects early-stage, hormone receptor-positive breast cancers in BRCA2 carriers, potentially avoiding chemotherapy.

Conclusions:

• Risk-reducing options for BRCA1/2 carriers have varied impacts on cancer incidence, treatment, quality of life, and survival.
• An online decision tool is available to support informed choices between patients and physicians.
• The tool facilitates shared decision-making for managing hereditary cancer risks.