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Somatic BRCA Mutation in Metastatic Breast Cancer
Tristan B Minick1, Robert A Norman2
1Dermatology, University of Florida, Gainesville, USA.
Cureus
|January 1, 2024
Summary
Metastatic breast cancer recurrence was treated effectively with olaparib (Lynparza) in a patient with BRCA2-deficient tumors, demonstrating a new therapeutic avenue for advanced disease.
Area of Science:
- Oncology
- Genetics
- Dermatology
Background:
- Multicentric invasive ductal breast carcinoma with lobular features presents a complex clinical challenge.
- Metastatic breast carcinoma requires effective treatment strategies to prevent recurrence and manage disease progression.
Observation:
- A 65-year-old female presented with new, asymptomatic raised erythematous lesions on her right upper arm.
- Biopsies confirmed metastatic breast carcinoma in both lesions.
Findings:
- FoundationOne testing revealed BRCA2 loss in the tumor, despite negative germline BRCA1/2 mutation results.
- Treatment with olaparib (Lynparza) resulted in no additional recurrences over two years.
Implications:
- PARP inhibitors like olaparib may be effective for metastatic breast cancer with somatic BRCA2 loss, even without germline mutations.
- Targeted therapy based on tumor genetic profile offers a promising approach for managing advanced breast cancer.
- This case highlights the importance of comprehensive genomic testing in guiding treatment decisions for recurrent metastatic breast cancer.
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