Risk-Reducing Salpingo-Oophorectomy and Breast Cancer Risk Reduction in the Gynecologic Oncology Group Protocol-0199...

Area of Science:

• Gynecologic Oncology
• Cancer Prevention
• Genetics

Background:

• Risk-reducing salpingo-oophorectomy (RRSO) is associated with a ~50% breast cancer risk reduction in BRCA1/2 pathogenic variant carriers.
• Recent findings have questioned the magnitude of this risk reduction.

Purpose of the Study:

• To evaluate the association between RRSO and breast cancer incidence.
• To assess the impact of RRSO on overall cancer risk in women with BRCA1/2 pathogenic variants or strong family histories.

Main Methods:

• Prospective cohort study comparing RRSO and ovarian cancer screening (OCS) groups.
• Estimated incidence rates of breast cancer and other cancers over 5 years.
• Used Cox regression to calculate hazard ratios for breast cancer in relation to RRSO.

Main Results:

• Among BRCA1/2 carriers, RRSO showed a non-significant trend towards lower breast cancer incidence (HR=0.86, P=.67).
• No significant differences in breast cancer incidence were observed in the overall population or subgroups.
• OCS cohort had 7 fallopian tube, 4 ovarian cancers; RRSO cohort had 1 primary peritoneal carcinoma.

Conclusions:

• RRSO may be associated with a small reduction in breast cancer incidence in BRCA1/2 carriers.
• The observed effect, if present, appears modest.
• This evidence necessitates comprehensive discussions about RRSO's impact on breast cancer risk for eligible women.