Overall survival in the OlympiA phase III trial of adjuvant olaparib in patients with germline pathogenic variants in BRCA1/2 and high-risk, early breast cancer

OlympiA Clinical Trial Steering Committee and Investigators, C. E. Geyer, J. E. Garber, R. D. Gelber, G. Yothers, M. Taboada, L. Ross, P. Rastogi, K. Cui, A. Arahmani, G. Aktan, A. C. Armstrong, M. Arnedos, J. Balmaña, J. Bergh, J. Bliss, S. Delaloge, S. M. Domchek, A. Eisen, F. ElsafyL. E. Fein, A. Fielding, J. M. Ford, S. Friedman, K. A. Gelmon, L. Gianni, M. Gnant, S. J. Hollingsworth, S. A. Im, A. Jager, Jóhannsson, S. R. Lakhani, W. Janni, B. Linderholm, T. W. Liu, N. Loman, L. Korde, S. Loibl, P. C. Lucas, F. Marmé, E. Martinez de Dueñas, R. McConnell, Kelly Anne Phillips, M. Piccart, G. Rossi, R. Schmutzler, E. Senkus, Z. Shao, P. Sharma, C. F. Singer, T. Španić, E. Stickeler, M. Toi, T. A. Traina, G. Viale, G. Zoppoli, Y. H. Park, R. Yerushalmi, H. Yang, D. Pang, K. H. Jung, A. Mailliez, Z. Fan, I. Tennevet, J. Zhang, T. Nagy, G. S. Sonke, Q. Sun, M. Parton, M. A. Colleoni, M. Schmidt, A. M. Brufsky, W. Razaq, B. Kaufman, D. Cameron, C. Campbell, A. N.J. Tutt, Paul Sevelda, Ferdinand Haslbauer, Monika Penzinger, Leopold Öhler, Christoph Tinchon, Richard Greil, Sonja Heibl, Rupert Bartsch, Viktor Wette, Christian F. Singer, Claudia Pasterk, Ruth Helfgott, Gunda Pristauz-Telsnigg, Herbert Stöger, Angsar Weltermann, Daniel Egle, Irene Thiel, David Fuchs, Holger Rumpold, Kathrin Strasser-Weippl, Beate Rautenberg, Volkmar Müller, Marcus Schmidt, Stefan Paepke, Mustafa Aydogdu, Christoph Thomssen, Joachim Rom, Christine Mau, Peter Fasching, Uwe Jochen Göhring, Thorsten Kühn, Stefanie Noeding, Sherko Kümmel, John Hackmann, Elmar Stickeler, Abhishek Joshi, Joanna Dewar, Michael Friedlander, Yoland Antill, Natasha Woodward, Ehtesham Abdi, Susan Tiley, Mathew George, David Boadle, Annabel Goodwin, Andre van der Westhuizen, George Kannourakis, Nicholas Murray, Nicole McCarthy, Judith Kroep, Maaike de Boer, Joan Heijns, Franciscus Erdkamp, Sandra Bakker, Gabe S. Sonke, Amer Sami, John Mackey, Catherine Prady, Andrea Eisen, Christine Desbiens, Erica Patocskai, Cristiano Ferrario, Louise Bordeleau, Haji Chalchal, Saroj Niraula, wolf ido wolf, François Duhoux, d'Hondt Randal d'Hondt, Sylvie Luce, Daphné t.Kint de Roodenbeke, Konstantinos Papadimitriou, Marleen Borms, Claire Quaghebeur, William Jacot, Etienne Brain, Laurence Venat-Bouvet, Alain Lortholary, Zbigniew Nowecki, Fátima Cardoso, Richard Hayward, Santiago Bella, Mauricio Fernández Lazzaro, Norma Pilnik, Luis E. Fein, Cesar Blajman, Guillermo Lerzo, Mirta Varela, Juan Jose Zarba, Diego Kaen, Maria Victoria Constanzo, Joke Tio, Wulf Siggelkow, Christian Jackisch, Eva Maria Grischke, Dirk Zahm, Sara Tato-Varela, Sabine Schmatloch, Peter Klare, Andrea Stefek, Kerstin Rhiem, Oliver Hoffmann, Mustafa Deryal, Isolde Gröll, Peter Ledwon, Christoph Uleer, Petra Krabisch, Jochem Potenberg, Maren Darsow, Tjoung Won Park-Simon, Heinz Gert Höffkes, Till Oliver Emde, Gerd Graffunder, Oliver Tomé, Dirk Forstmeyer, Jürgen Terhaag, Christoph Salat, Karin Kast, Steffi Weniger, Carsten Schreiber, Bernhard Heinrich, Max Dieterich, Michaela Penelope Wüllner, Raquel Andrés Conejero, Robert D. Siegel

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Abstract

Background: The randomized, double-blind OlympiA trial compared 1 year of the oral poly(adenosine diphosphate-ribose) polymerase inhibitor, olaparib, to matching placebo as adjuvant therapy for patients with pathogenic or likely pathogenic variants in germline BRCA1 or BRCA2 (gBRCA1/2pv) and high-risk, human epidermal growth factor receptor 2-negative, early breast cancer (EBC). The first pre-specified interim analysis (IA) previously demonstrated statistically significant improvement in invasive disease-free survival (IDFS) and distant disease-free survival (DDFS). The olaparib group had fewer deaths than the placebo group, but the difference did not reach statistical significance for overall survival (OS). We now report the pre-specified second IA of OS with updates of IDFS, DDFS, and safety. Patients and methods: One thousand eight hundred and thirty-six patients were randomly assigned to olaparib or placebo following (neo)adjuvant chemotherapy, surgery, and radiation therapy if indicated. Endocrine therapy was given concurrently with study medication for hormone receptor-positive cancers. Statistical significance for OS at this IA required P < 0.015. Results: With a median follow-up of 3.5 years, the second IA of OS demonstrated significant improvement in the olaparib group relative to the placebo group [hazard ratio 0.68; 98.5% confidence interval (CI) 0.47-0.97; P = 0.009]. Four-year OS was 89.8% in the olaparib group and 86.4% in the placebo group (Δ 3.4%, 95% CI −0.1% to 6.8%). Four-year IDFS for the olaparib group versus placebo group was 82.7% versus 75.4% (Δ 7.3%, 95% CI 3.0% to 11.5%) and 4-year DDFS was 86.5% versus 79.1% (Δ 7.4%, 95% CI 3.6% to 11.3%), respectively. Subset analyses for OS, IDFS, and DDFS demonstrated benefit across major subgroups. No new safety signals were identified including no new cases of acute myeloid leukemia or myelodysplastic syndrome. Conclusion: With 3.5 years of median follow-up, OlympiA demonstrates statistically significant improvement in OS with adjuvant olaparib compared with placebo for gBRCA1/2pv-associated EBC and maintained improvements in the previously reported, statistically significant endpoints of IDFS and DDFS with no new safety signals.

Original languageEnglish
Pages (from-to)1250-1268
Number of pages19
JournalAnnals of Oncology
Volume33
Issue number12
DOIs
StatePublished - Dec 1 2022

Keywords

  • BRCA1/2
  • PARP inhibition
  • adjuvant therapy
  • breast cancer
  • olaparib

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