Maintained complete response to talazoparib in a BRCA-2 mutated metastatic luminal breast cancer: case report and review of literature

• Published in: Frontiers in oncology Vol. 13; p. 1158981
• Main Authors: Albarrán, Víctor, Chamorro, Jesús, Pozas, Javier, San Román, María, Rosero, Diana Isabel, Saavedra, Cristina, Gion, María, Cortés, Alfonso, Escalera, Elena, Guerra, Eva, López Miranda, Elena, Fernández Abad, María, Martínez Jañez, Noelia
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Media S.A 05-05-2023
• Subjects: BRCA; breast cancer; germline; olaparib; Oncology; PARP inhibitors; talazoparib; BRCA; breast cancer; germline; talazoparib; PARP inhibitors; olaparib
• ISSN: 2234-943X; 2234-943X
• DOI: 10.3389/fonc.2023.1158981

PARP inhibitors are progressively becoming a part of our therapeutic arsenal against BRCA-defective tumors, because of their capacity to induce synthetic lethality in cells with a deficiency in the homologous recombination repair system. Olaparib and talazoparib have been approved for metastatic breast cancer in carriers of germline BRCA mutations, which are found in approximately 6% of patients with breast cancer. We report the case of a patient with metastatic breast cancer, carrier of a germline mutation in BRCA2, with a complete response to first-line treatment with talazoparib, maintained after 6 years. To the best of our knowledge, this is the longest response reported with a PARP inhibitor in a BRCA-mutated tumor. We have made a review of literature, regarding the rationale for PARP inhibitors in carriers of BRCA mutations and their clinical relevance in the management of advanced breast cancer, as well as their emerging role in early stage disease, alone and in combination with other systemic therapies.