Impact of DNA damage repair defects on response to PSMA radioligand therapy in metastatic castration-resistant prostate cancer
Privé, Bastiaan M.; Slootbeek, Peter H.J.; Laarhuis, Babette I.; Naga, Samhita Pamidimarri; van der Doelen, Maarten J.; van Kalmthout, Ludwike W.M.; de Keizer, Bart; Ezziddin, Samer; Kratochwil, Clemens; Morgenstern, Alfred; Bruchertseifer, Frank; Ligtenberg, Marjolijn J.L.; Witjes, J. Alfred; van Oort, Inge M.; Gotthardt, Martin; Heskamp, Sandra; Janssen, Marcel J.R.; Gerritsen, Winald R.; Nagarajah, James; Mehra, Niven
(2022) Prostate cancer and prostatic diseases, volume 25, issue 1, pp. 71 - 78
(Article)
Abstract
Purpose: Prostate-specific membrane antigen radioligand therapy (PSMA-RLT) is a novel treatment for castration-resistant prostate cancer (mCRPC). While the majority of patients responds to PSMA-RLT, with 10–15% having an exceptional response, approximately 30% of patients is unresponsive to PSMA-RLT. The molecular underpinning may in part explain these varying responses. This study
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investigated alterations in DNA damage repair (DDR) genes in tumour biopsies and their association with response to PSMA-RLT. Methods: A predefined retrospective cohort study was performed in mCRPC patients of whom the tumours had undergone next-generation sequencing of 40 DDR genes and received Lu-177-PSMA and/or Ac-225-PSMA-RLT. The primary outcome of this study was to compare the progression free survival (PFS) after PSMA-RLT for patients with and without pathogenic DDR aberrations in their tumour. Secondary outcomes were prostate-specific antigen (PSA) response and overall survival (OS). Results: A total of 40 patients were included of which seventeen had a tumour with a pathogenic DDR aberration (DDR+), of which eight had defects in BRCA1/2. DDR+ patients had an equal varying response to PSMA-RLT compared to those without pathological DDR anomalies (DDR-) in terms of PFS (5.9 vs. 6.4 months, respectively; HR 1.14; 95% CI 0.58-2.25; p = 0.71), ≥50% PSA response (59% vs. 65%, respectively; p = 0.75) or OS (11.1 vs. 10.7 months, respectively; HR 1.40; 95% CI: 0.68–2.91; p = 0.36). Conclusion: In this study of a selected cohort, pathogenic DDR aberrations were not associated with exceptional responsiveness to PSMA-RLT. Translational studies in larger prospective cohorts are warranted to associate DDR gene defects with differential responses to PSMA-RLT.
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Keywords: Oncology, Urology, Cancer Research
ISSN: 1365-7852
Publisher: Nature Publishing Group
Note: Funding Information: We thank all the investigators of the study, the patients and their families. Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
(Peer reviewed)