Gray matter volume in women with the BRCA mutation with and without ovarian removal: evidence for increased risk of...

Area of Science:

• Neuroscience
• Oncology
• Endocrinology

Background:

• Ovarian removal before natural menopause is linked to higher dementia risk, possibly due to lost estradiol.
• Women with BRCA mutations undergo oophorectomy to reduce cancer risk, but neurological effects are understudied.
• Previous studies suggest cortical thinning and cognitive changes after oophorectomy.

Purpose of the Study:

• To investigate whole-brain gray matter volume differences in women with BRCA mutations before and after oophorectomy.
• To compare neurological effects of oophorectomy with and without estradiol hormone therapy.
• To assess the impact of BRCA mutations and early oophorectomy on brain structure.

Main Methods:

• Cross-sectional study using high-resolution quantitative MRI.
• Compared gray matter volume in four groups: BRCA-positive pre-oophorectomy, post-oophorectomy without hormone therapy, post-oophorectomy with hormone therapy, and age-matched controls.
• Analyzed whole-brain gray matter differences.

Main Results:

• Women with BRCA mutations (pre- and post-oophorectomy) showed significantly lower gray matter volume in medial temporal and frontal lobes.
• Post-oophorectomy estradiol therapy group had fewer gray matter volume reductions compared to controls.
• All BRCA mutation groups exhibited higher gray matter volume than controls, indicating plasticity.

Conclusions:

• BRCA mutations and early oophorectomy may contribute to increased late-life dementia risk.
• Post-surgical estradiol therapy may help reduce gray matter loss in BRCA carriers who undergo oophorectomy.
• Findings support the role of estradiol in maintaining brain structure and potentially mitigating dementia risk.