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Loehr A, Patnaik A, Campbell D, Shapiro J, Bryce AH, McDermott R, Sautois B, Vogelzang NJ, Bambury RM, Voog E, Zhang J, Piulats JM, Hussain A, Ryan CJ, Merseburger AS, Daugaard G, Heidenreich A, Fizazi K, Higano CS, Krieger LE, Sternberg CN, Watkins SP, Despain D, Simmons AD, Dowson M, Golsorkhi T, Chowdhury S, Abida W. Response to Rucaparib in BRCA-Mutant Metastatic Castration-Resistant Prostate Cancer Identified by Genomic Testing in the TRITON2 Study. Clin Cancer Res 2021; 27:6677-6686. [PMID: 34598946 PMCID: PMC8678310 DOI: 10.1158/1078-0432.ccr-21-2199] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 08/18/2021] [Accepted: 09/27/2021] [Indexed: 11/16/2022]
Abstract
PURPOSE The PARP inhibitor rucaparib is approved in the United States for patients with metastatic castration-resistant prostate cancer (mCRPC) and a deleterious germline and/or somatic BRCA1 or BRCA2 (BRCA) alteration. While sequencing of tumor tissue is considered the standard for identifying patients with BRCA alterations (BRCA+), plasma profiling may provide a minimally invasive option to select patients for rucaparib treatment. Here, we report clinical efficacy in patients with BRCA+ mCRPC identified through central plasma, central tissue, or local genomic testing and enrolled in TRITON2. PATIENTS AND METHODS Patients had progressed after next-generation androgen receptor-directed and taxane-based therapies for mCRPC and had BRCA alterations identified by central sequencing of plasma and/or tissue samples or local genomic testing. Concordance of plasma/tissue BRCA status and objective response rate and prostate-specific antigen (PSA) response rates were summarized. RESULTS TRITON2 enrolled 115 patients with BRCA+ identified by central plasma (n = 34), central tissue (n = 37), or local (n = 44) testing. Plasma/tissue concordance was determined in 38 patients with paired samples and was 47% in 19 patients with a somatic BRCA alteration. No statistically significant differences were observed between objective and PSA response rates to rucaparib across the 3 assay groups. Patients unable to provide tissue samples and tested solely by plasma assay responded at rates no different from patients identified as BRCA+ by tissue testing. CONCLUSIONS Plasma, tissue, and local testing of mCRPC patients can be used to identify men with BRCA+ mCRPC who can benefit from treatment with the PARP inhibitor rucaparib.
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Affiliation(s)
- Andrea Loehr
- Translational Medicine, Clovis Oncology, Inc., Boulder, Colorado
| | - Akash Patnaik
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Chicago, Illinois
| | - David Campbell
- Medical Oncology, Barwon Health, University Hospital Geelong, Geelong, Victoria, Australia
| | - Jeremy Shapiro
- Medical Oncology, Cabrini Hospital, Malvern, Victoria, Australia
| | - Alan H Bryce
- Hematology and Medical Oncology, Mayo Clinic, Phoenix, Arizona
| | - Ray McDermott
- Genitourinary Oncology, Adelaide and Meath Hospital (Incorporating the National Children's Hospital), Dublin, Ireland
| | - Brieuc Sautois
- Department of Medical Oncology, University Hospital of Liège, CHU Sart Tilman, Liège, Belgium
| | | | | | - Eric Voog
- Medical Oncology, Clinique Victor Hugo Centre Jean Bernard, Le Mans, France
| | - Jingsong Zhang
- Genitourinary Oncology Program, H. Lee Moffitt Cancer Center, Tampa, Florida
| | - Josep M Piulats
- Medical Oncology, Institut Català d'Oncologia, Barcelona, Spain
| | - Arif Hussain
- Department of Medicine, Greenebaum Cancer Center, Baltimore, Maryland
| | - Charles J Ryan
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | | | - Gedske Daugaard
- Department of Oncology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Axel Heidenreich
- Department of Urology, Universitätsklinikum Köln, Cologne, Germany
| | - Karim Fizazi
- Department of Cancer Medicine, Institut Gustave Roussy, University of Paris Saclay, Villejuif Cedex, France
| | - Celestia S Higano
- Department of Medicine, Division of Oncology, University of Washington and Fred Hutchinson Cancer Research Center, Seattle, WA
| | - Laurence E Krieger
- Oncology, Genesis Care Integrative Cancer Centre, St Leonards, Sydney, New South Wales, Australia
| | - Cora N Sternberg
- Englander Institute for Precision Medicine, Weill Cornell Medicine, New York-Presbyterian, New York, New York
| | - Simon P Watkins
- Clinical Science, Clovis Oncology UK, Ltd., Cambridge, United Kingdom
| | | | - Andrew D Simmons
- Translational Medicine, Clovis Oncology, Inc., Boulder, Colorado
| | - Melanie Dowson
- Study Operations, Clovis Oncology UK, Ltd., Cambridge, United Kingdom
| | - Tony Golsorkhi
- Clinical Development, Clovis Oncology, Inc., Boulder, Colorado
| | - Simon Chowdhury
- Medical Oncology, Guy's Hospital and Sarah Cannon Research Institute, London, United Kingdom
| | - Wassim Abida
- Genitourinary Oncology Service, Memorial Sloan Kettering Cancer Center, New York, New York.
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