{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T01:37:29Z","timestamp":1773884249720,"version":"3.50.1"},"reference-count":39,"publisher":"American Society of Clinical Oncology (ASCO)","issue":"3","content-domain":{"domain":["ascopubs.org"],"crossmark-restriction":true},"short-container-title":["JCO Precis Oncol"],"published-print":{"date-parts":[[2026,3]]},"abstract":"<jats:sec>\n                    <jats:title>PURPOSE<\/jats:title>\n                    <jats:p>Poly(ADP-ribose) polymerase inhibitors (PARPis) are effective for the treatment of metastatic castration-resistant prostate cancer (mCRPC) harboring homologous recombination repair (HRR) gene alterations, but predictive biomarkers beyond individual gene alterations remain poorly defined. We aimed to identify genomic features associated with response to PARP inhibition in real-world data.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>MATERIALS AND METHODS<\/jats:title>\n                    <jats:p>This is a single-center retrospective study of patients with mCRPC who received PARPi therapy. All patients underwent tumor genomic profiling using a single panel sequencing assay. Responses were defined as prostate-specific antigen (PSA50) (\u226550% PSA decline from baseline) and objective radiographic response by RECIST 1.1. We explored the association of genomic features with response to therapy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>\n                      Among 120 patients with mCRPC who received a PARPi, 54% had\n                      <jats:italic toggle=\"yes\">BRCA2<\/jats:italic>\n                      \/\n                      <jats:italic toggle=\"yes\">1<\/jats:italic>\n                      alterations and 16% had no HRR gene alterations. Other alterations include\n                      <jats:italic toggle=\"yes\">ATM<\/jats:italic>\n                      (10%),\n                      <jats:italic toggle=\"yes\">CDK12<\/jats:italic>\n                      (10%),\n                      <jats:italic toggle=\"yes\">BARD1<\/jats:italic>\n                      (2%),\n                      <jats:italic toggle=\"yes\">CHEK2<\/jats:italic>\n                      (7%), and\n                      <jats:italic toggle=\"yes\">PALB2<\/jats:italic>\n                      (2%). Overall, 37% had PSA50 responses (95% CI, 27 to 47) and 43% had RECIST responses (95% CI, 27 to 61). Patients with\n                      <jats:italic toggle=\"yes\">BRCA2<\/jats:italic>\n                      alterations had the highest response rates (52% PSA50, 72% RECIST), and biallelic\n                      <jats:italic toggle=\"yes\">BRCA2<\/jats:italic>\n                      loss was associated with better outcomes. Panel-based mutational signatures (SigMA, SBS3 from DeepSig) were associated with\n                      <jats:italic toggle=\"yes\">BRCA<\/jats:italic>\n                      -mutated status and overall response to PARPi. Six patients without known HRR gene alterations had responses; one was later found to harbor\n                      <jats:italic toggle=\"yes\">BRCA2<\/jats:italic>\n                      loss. Limitations include the small study size, retrospective design, and use of panel-based sequencing.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSION<\/jats:title>\n                    <jats:p>\n                      Most PARPi responders had alterations in HRR genes, particularly\n                      <jats:italic toggle=\"yes\">BRCA2<\/jats:italic>\n                      , although some responders lacked known biomarkers associated with PARPi response. Our findings in this real-world data set support HRR gene testing for PARPi use in mCRPC and highlight the need for novel genome-wide biomarkers for patient selection.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1200\/po-25-00934","type":"journal-article","created":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T19:59:10Z","timestamp":1773863950000},"update-policy":"https:\/\/doi.org\/10.1200\/crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Genomic Features and Response to Poly(ADP-ribose) Polymerase Inhibition in Metastatic Castration-Resistant Prostate Cancer"],"prefix":"10.1200","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-2545-7513","authenticated-orcid":true,"given":"Jeffery C.W.","family":"Chang","sequence":"first","affiliation":[{"name":"Genitourinary Oncology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Subhiksha","family":"Nandakumar","sequence":"additional","affiliation":[{"name":"Department of Epidemiology &amp; Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0722-1311","authenticated-orcid":true,"given":"Konrad H.","family":"Stopsack","sequence":"additional","affiliation":[{"name":"Genitourinary Oncology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY"},{"name":"Department of Epidemiological Methods and Etiologic Research, Leibniz Institute for Prevention Research and Epidemiology\u2014BIPS and Faculty of Human and Health Sciences, University of Bremen, Bremen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher","family":"Fong","sequence":"additional","affiliation":[{"name":"Department of Epidemiology &amp; Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karl","family":"Pichotta","sequence":"additional","affiliation":[{"name":"Department of Epidemiology &amp; Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9783-0139","authenticated-orcid":true,"given":"Justin","family":"Jee","sequence":"additional","affiliation":[{"name":"Department of Epidemiology &amp; Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3220-2064","authenticated-orcid":true,"given":"Hyung Jun","family":"Woo","sequence":"additional","affiliation":[{"name":"Marie-Jos\u00e9e and Henry R. 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