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ASCO 2025 | ABCSG 45: olaparib and carboplatin versus TAC in HRD-positive TNBC

Christian Singer, MD, MPH, Medical University of Vienna, Vienna, Austria, discusses primary results from the Phase II ABCSG 45 trial (EU CT 2024-512821-10) of neoadjuvant olaparib with carboplatin versus docetaxel, epirubicin and cyclophosphamide (TAC) in patients with early triple-negative breast cancer (TNBC) and homologous recombination deficiency (HRD). While TAC showed consistently high pathological and residual cancer responses across all patients, olaparib and carboplatin demonstrated notable activity in those with BRCA1/2 pathogenic variants. This interview took place during the 2025 American Society of Clinical Oncology (ASCO) Meeting in Chicago, IL.

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Transcript

ABCSG45 is a trial which we conducted in HR-positive triple-negative breast cancer patients. It’s a trial that was set in the neoadjuvant setting. The primary endpoint was the residual cancer burden score. So the idea was to offer a new kind of combination between carboplatin and a PARP inhibitor named olaparib, and we were wondering whether the RCB0 rate, which is the complete or the almost complete pathological remission, would actually increase...

ABCSG45 is a trial which we conducted in HR-positive triple-negative breast cancer patients. It’s a trial that was set in the neoadjuvant setting. The primary endpoint was the residual cancer burden score. So the idea was to offer a new kind of combination between carboplatin and a PARP inhibitor named olaparib, and we were wondering whether the RCB0 rate, which is the complete or the almost complete pathological remission, would actually increase. We did see that this was the case for patients with a BRCA-mutated tumor, but in patients without BRCA-mutated tumors, the efficacy of Olaparib-carboplatin combinations were lower.

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Disclosures

Honoraria – AstraZeneca/MedImmune; Daiichi Sankyo Europe GmbH; Novartis
Consulting or Advisory Role – AstraZeneca/MedImmune; Daiichi-Sanyko; Gilead Sciences; Novartis; Sanofi/Aventis
Speakers’ Bureau – AstraZeneca/MedImmune; Novartis
Research Funding – Amgen; Amgen; AstraZeneca/MedImmune; Myriad Genetics; Novartis; Roche; Sanofi
Travel, Accommodations, Expenses – Daiichi-Sankyo; Gilead Sciences; Novartis; Roche