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Tolmeijer SH, van Wilpe S, Geerlings MJ, von Rhein D, Smilde TJ, Kloots ISH, Westdorp H, Coskuntürk M, Oving IM, van Ipenburg JA, van der Heijden AG, Hofste T, Weiss MM, Schalken JA, Gerritsen WR, Ligtenberg MJL, Mehra N. Early On-treatment Circulating Tumor DNA Measurements and Response to Immune Checkpoint Inhibitors in Advanced Urothelial Cancer. Eur Urol Oncol 2024; 7:282-291. [PMID: 37673768 DOI: 10.1016/j.euo.2023.08.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 07/29/2023] [Accepted: 08/15/2023] [Indexed: 09/08/2023]
Abstract
BACKGROUND Immune checkpoint inhibitors (ICIs) can induce durable disease control in metastatic urothelial cancer (mUC), but only 20-25% of patients respond. Early identification of a nondurable response will improve management strategies. OBJECTIVE To investigate whether on-treatment circulating tumor DNA (ctDNA) measurements can predict ICI responsiveness in mUC patients. DESIGN, SETTING, AND PARTICIPANTS This study consists of a discovery cohort of 40 mUC patients and a prospective multicenter validation cohort of 16 mUC patients. Plasma cell-free DNA was collected at baseline and after 3 and 6 wk on ICIs. The ctDNA levels were calculated from targeted sequencing. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS Outcome measurements were progression-free survival (PFS), overall survival (OS), and nondurable response (PFS ≤6 mo). Relationships with ctDNA were assessed using Cox regression. Changes in ctDNA level at 3 and 6 wk were categorized by an increase or decrease relative to baseline. RESULTS AND LIMITATIONS In the discovery cohort, ctDNA was detected in 37/40 (93%) of patients at baseline. A ctDNA increase was observed in 12/15 (80%) and ten of 12 (83%) patients with a nondurable response at 3 and 6 wk, respectively. Of patients with a durable response (PFS >6 mo), 94% showed a decrease. A ctDNA increase at 3 wk was associated with shorter PFS (hazard ratio [HR] 7.8, 95% confidence interval [CI] 3.1-19.5) and OS (HR 8.0, 95% CI 3.0-21.0), independent of clinical prognostic variables. Similar results were observed at 6 wk. The 3-wk association with PFS was validated in a prospective cohort (HR 7.5, 95% CI 1.3-42.6). Limitations include the limited number of patients. CONCLUSIONS Early changes in ctDNA levels are strongly linked to the duration of ICI benefit in mUC and may contribute to timely therapy modifications. PATIENT SUMMARY Benefit from immunotherapy can be predicted after only 3 wk of treatment by investigating cancer DNA in blood. This could help in timely therapy changes for urothelial cancer patients with limited benefit from immunotherapy.
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Affiliation(s)
- Sofie H Tolmeijer
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Sandra van Wilpe
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Maartje J Geerlings
- Department of Human Genetics, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Daniel von Rhein
- Department of Human Genetics, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Tineke J Smilde
- Department of Medical Oncology, Jeroen Bosch Ziekenhuis, 's-Hertogenbosch, The Netherlands
| | - Iris S H Kloots
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Harm Westdorp
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Mustafa Coskuntürk
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Irma M Oving
- Department of Medical Oncology, Ziekenhuisgroep Twente, Almelo, The Netherlands
| | - Jolique A van Ipenburg
- Department of Pathology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Antoine G van der Heijden
- Department of Urology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Tom Hofste
- Department of Human Genetics, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marjan M Weiss
- Department of Human Genetics, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jack A Schalken
- Department of Urology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Winald R Gerritsen
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marjolijn J L Ligtenberg
- Department of Human Genetics, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands; Department of Pathology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Niven Mehra
- Department of Medical Oncology, Research Institute for Medical Innovation, Radboud University Medical Center, Nijmegen, The Netherlands.
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Slootbeek PHJ, Kloots ISH, van Oort IM, Kroeze LI, Schalken JA, Bloemendal HJ, Mehra N. Cross-Resistance between Platinum-Based Chemotherapy and PARP Inhibitors in Castration-Resistant Prostate Cancer. Cancers (Basel) 2023; 15:2814. [PMID: 37345149 DOI: 10.3390/cancers15102814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/12/2023] [Accepted: 05/16/2023] [Indexed: 06/23/2023] Open
Abstract
Patients with metastatic castration-resistant prostate cancer (mCRPC) harbouring homologous recombination repair-related gene aberrations (HRRm) can derive meaningful benefits from both platinum-based chemotherapy (PlCh) and PARP inhibitors (PARPi). Cross-resistance between these agents is well-recognised in other tumour types but data on prostate cancer is lacking. In this retrospective pre-planned study, we assessed 28 HRRm mCRPC patients who received PlCh and PARPi. Progression-free survival (PFS) on initial therapy was longer than on subsequent therapy (median 5.3 vs. 3.4 months, p = 0.016). The median PFS of PlCh was influenced by the order of agents, with 3.6 months shorter PFS after PARPi than when administered first. The median PFS of PARPi was less influenced, with 0.9 months shorter PFS after PlCh than before. In the PARPi-first subgroup, six out of 16 evaluable patients (37.5%) had a >50% PSA decline to PlCh, and two of eight (25.0%) had a radiographic response to PlCh. In the PlCh-first subgroup, 6/10 (60.0%) had a >50% PSA decline, and 5/9 (55.6%) had a radiographic response to PARPi. These data show >40% of the cohort is sensitive to a subsequent HRR-targeting agent. PlCh appears to induce less cross-resistance than PARPi. Additional data on resistance mechanisms will be crucial in defining an optimal treatment sequence in HRRm mCRPC patients.
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Affiliation(s)
- Peter H J Slootbeek
- Department of Medical Oncology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Iris S H Kloots
- Department of Medical Oncology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Inge M van Oort
- Department of Urology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Leonie I Kroeze
- Department of Pathology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Jack A Schalken
- Department of Urology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Haiko J Bloemendal
- Department of Medical Oncology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Niven Mehra
- Department of Medical Oncology, Radboud University Medical Center, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands
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3
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Slootbeek PHJ, Kloots ISH, Smits M, van Oort IM, Gerritsen WR, Schalken JA, Ligtenberg MJL, Grünberg K, Kroeze LI, Bloemendal HJ, Mehra N. Impact of molecular tumour board discussion on targeted therapy allocation in advanced prostate cancer. Br J Cancer 2022; 126:907-916. [PMID: 34912074 PMCID: PMC8927341 DOI: 10.1038/s41416-021-01663-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 11/16/2021] [Accepted: 12/01/2021] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Molecular tumour boards (MTB) optimally match oncological therapies to patients with genetic aberrations. Prostate cancer (PCa) is underrepresented in these MTB discussions. This study describes the impact of routine genetic profiling and MTB referral on the outcome of PCa patients in a tertiary referral centre. METHODS All PCa patients that received next-generation sequencing results and/or were discussed at an MTB between Jan 1, 2017 and Jan 1, 2020 were included. Genetically matched therapies (GMT) in clinical trials or compassionate use were linked to actionable alterations. Response to these agents was retrospectively evaluated. RESULTS Out of the 277 genetically profiled PCa patients, 215 (78%) were discussed in at least one MTB meeting. A GMT was recommended to 102 patients (47%), of which 63 patients (62%) initiated the GMT. The most recommended therapies were PARP inhibitors (n = 74), programmed death-(ligand) 1 inhibitors (n = 21) and tyrosine kinase inhibitors (n = 19). Once started, 41.3% had a PFS of ≥6 months, 43.5% a PSA decline ≥50% and 38.5% an objective radiographic response. CONCLUSION Recommendation for a GMT is achieved in almost half of the patients with advanced prostate cancer, with GMT initiation leading to durable responses in over 40% of patients. These data justify routine referral of selected PCa patients to MTB's.
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Affiliation(s)
- Peter H J Slootbeek
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
- Radboud University Medical Centre, Radboud institute for Molecular Life sciences, Department of Experimental Urology, Nijmegen, The Netherlands
| | - Iris S H Kloots
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Minke Smits
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Inge M van Oort
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Urology, Nijmegen, The Netherlands
| | - Winald R Gerritsen
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Jack A Schalken
- Radboud University Medical Centre, Radboud institute for Molecular Life sciences, Department of Experimental Urology, Nijmegen, The Netherlands
| | - Marjolijn J L Ligtenberg
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Pathology, Nijmegen, The Netherlands
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Human Genetics, Nijmegen, The Netherlands
| | - Katrien Grünberg
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Pathology, Nijmegen, The Netherlands
| | - Leonie I Kroeze
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Pathology, Nijmegen, The Netherlands
| | - Haiko J Bloemendal
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Niven Mehra
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands.
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Slootbeek PHJ, Kloots ISH, Smits M, van Oort IM, Gerritsen WR, Schalken JA, Ligtenberg MJL, Grünberg K, Kroeze LI, Bloemendal HJ, Mehra N. Correction to: Impact of molecular tumour board discussion on targeted therapy allocation in advanced prostate cancer. Br J Cancer 2022; 126:1108. [PMID: 35210590 PMCID: PMC8980086 DOI: 10.1038/s41416-022-01765-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Peter H J Slootbeek
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands.,Radboud University Medical Centre, Radboud institute for Molecular Life sciences, Department of Experimental Urology, Nijmegen, The Netherlands
| | - Iris S H Kloots
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Minke Smits
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Inge M van Oort
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Urology, Nijmegen, The Netherlands
| | - Winald R Gerritsen
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Jack A Schalken
- Radboud University Medical Centre, Radboud institute for Molecular Life sciences, Department of Experimental Urology, Nijmegen, The Netherlands
| | - Marjolijn J L Ligtenberg
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Pathology, Nijmegen, The Netherlands.,Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Human Genetics, Nijmegen, The Netherlands
| | - Katrien Grünberg
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Pathology, Nijmegen, The Netherlands
| | - Leonie I Kroeze
- Radboud University Medical Centre, Radboud Institute for Molecular Life sciences, Department of Pathology, Nijmegen, The Netherlands
| | - Haiko J Bloemendal
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands
| | - Niven Mehra
- Radboud University Medical Centre, Radboud Institute for Health Sciences, Department of Medical Oncology, Nijmegen, The Netherlands.
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Kloots ISH, Slootbeek PH, Smits M, van Helvert S, Kroeze LI, Kets M, Grünberg K, van Ipenburg J, Ligtenberg M, Schalken JA, van Oort IM, Bloemendal H, Gerritsen WR, Mehra N. First results of the PROMPT trial: Precision oncology allocation in patients with early castration-resistant prostate cancer following routine molecular profiling. J Clin Oncol 2022. [DOI: 10.1200/jco.2022.40.6_suppl.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
40 Background: Castration-resistant prostate cancer (CRPC) comprises distinct molecular actionable subtypes. Radboudumc, a tertiary referral center for PCa, hosts a Molecular Tumor Board (MTB), and frequently sees CRPC patients (pts) for referral for genetic testing. In the period 2017-2020, almost 50% of heavily pre-treated CRPC pts received a recommendation for a genetically matched therapy (GMT). In 2020 we initiated the PROMPT trial (NCT04746300) to prospectively study the impact of routine early molecular characterization in CRPC. Increased GMT utilization of targeted- and immunotherapy may improve outcome and quality of life of pts with metastatic CRPC, and lead to lower medical resource utilization (MRU). Here we report on first results from our observational trial. Methods: Within the PROMPT trial, prior to receiving first- or second line standard of care CRPC therapy, up to 300 pts were offered molecular tumor characterization with the TruSightOncology 500 panel (TSO500). Formalin-fixed paraffin-embedded prostate or metastatic tissue biopsies were used, preferably newly obtained. To assess both mutations and copy number alterations, the TSO500 required a minimal tumor cell percentage (TC%) of 30%. Results were discussed within the Radboudumc MTB for GMT recommendation. Actionable targets were defined per Precision Medicine Working group criteria and, when druggable, within the Drug Rediscovery Protocol trial (NCT02925234). All pts with tumor mutations carrying with a risk for cancer predisposition were referred for genetic counselling. Follow-up with patient-reported outcomes (EORTC QLQ-C30, EQ5D, BPI & EPIC-26 questionnaires) and MRU was conducted every 3 months until withdrawal or death. Results: From February 2020 until October 2021 we included 284 consecutive CRPC pts with a median age of 70 years (range 46-86) with a median follow-up of 6.8 months. Newly obtained biopsies and archival material was used in 131 and 126 pts, respectively. Median TC% was 60% (range: 20-90%). TSO500 results could be reported in 254 (89%) cases, with at least one putative clinically relevant aberration in 188 evaluable pts (74%). In 100 pts (39,4%) ≥ 1 druggable target was found. Most common actionable alterations were in PTEN (19%), BRCA2 (9%) or in mismatch-repair genes or resulting in high tumor mutational burden (5%). Out of the 100 druggable pts, 31 pts (31%) initiated a form of GMT, 4 pts (4%; 2 BRCA2, 2 PTEN) died prior to receiving GMT, in 65 pts (65%) GMT is pending as they receive standard of care. Conclusions: Routine molecular profiling early in the CRPC setting is feasible in a tertiary referral center with a MTB and high volume of CRPC pts. Almost 40% CRPC pts harbored an actionable target with 31% of these pts already allocated to a GMT. Failure rates of NGS were low at 11%.
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Affiliation(s)
- Iris S. H. Kloots
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Peter H.J. Slootbeek
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Minke Smits
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Sjoerd van Helvert
- Department of Pathology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Leonie I. Kroeze
- Department of Pathology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Marleen Kets
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, Netherlands
| | - Katrien Grünberg
- Department of Pathology and Human Genetics, Radboud University Medical Center, Nijmegen, Netherlands
| | - Jolique van Ipenburg
- Department of Pathology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Marjolijn Ligtenberg
- Department of Pathology and Human Genetics, Radboud University Medical Center, Nijmegen, Netherlands
| | - Jack A. Schalken
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Inge M. van Oort
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Haiko Bloemendal
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Winald R. Gerritsen
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Niven Mehra
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
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Simnica D, Smits M, Willscher E, Fanchi LF, Kloots ISH, van Oort I, Gerritsen W, Mehra N, Binder M. Responsiveness to Immune Checkpoint Inhibitors Is Associated With a Peripheral Blood T-Cell Signature in Metastatic Castration-Resistant Prostate Cancer. JCO Precis Oncol 2020; 4:1374-1385. [PMID: 35050788 DOI: 10.1200/po.20.00209] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
PURPOSE Although most patients with microsatellite instable (MSI) metastatic castration-resistant prostate cancer (mCRPC) respond to immune checkpoint blockade (ICB), only a small subset of patients with microsatellite stable (MSS) tumors have similar benefit. Biomarkers defining ICB-susceptible subsets of patients with MSS mCRPC are urgently needed. METHODS Using next-generation T-cell repertoire sequencing, we explored immune signatures in 54 patients with MSS and MSI mCRPC who were treated with or without ICB. We defined subset-specific immune metrics as well as T-cell clusters and correlated the signatures with treatment benefit. RESULTS Consistent overlaps between tumor and peripheral T-cell repertoires suggested that blood was an informative material to identify relevant T-cell signatures. We found considerably higher blood T-cell richness and diversity and more shared T-cell clusters with low generation probability (pGen) in MSI versus MSS mCRPC, potentially reflecting more complex T-cell responses because of a greater neoepitope load in the MSI subset. Interestingly, patients with MSS mCRPC with shared low pGen T-cell clusters showed significantly better outcomes with ICB, but not with other treatments, compared with patients without such clusters. Blood clearance of T-cell clusters on ICB treatment initiation seemed to be compatible with T-cell migration to the primary tumor or metastatic sites during the process of clonal replacement as described for other tumors receiving ICB. CONCLUSION The MSI mCRPC subset shows a distinct T-cell signature that can be detected in blood. This signature points to immune parameters that could help identify a subset of patients with MSS mCRPC who may have an increased likelihood of responding to ICB or to combination approaches including ICB.
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Affiliation(s)
- Donjete Simnica
- Department of Internal Medicine IV, Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
| | - Minke Smits
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Edith Willscher
- Department of Internal Medicine IV, Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
| | | | - Iris S H Kloots
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Inge van Oort
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Winald Gerritsen
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Niven Mehra
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Mascha Binder
- Department of Internal Medicine IV, Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
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7
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Slootbeek PHJ, Duizer ML, van der Doelen MJ, Kloots ISH, Kuppen MCP, Westgeest HM, Uyl-de Groot CA, Pamidimarri Naga S, Ligtenberg MJL, van Oort IM, Gerritsen WR, Schalken JA, Kroeze LI, Bloemendal HJ, Mehra N. Impact of DNA damage repair defects and aggressive variant features on response to carboplatin-based chemotherapy in metastatic castration-resistant prostate cancer. Int J Cancer 2020; 148:385-395. [PMID: 32965028 PMCID: PMC7756382 DOI: 10.1002/ijc.33306] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 08/08/2020] [Accepted: 08/21/2020] [Indexed: 02/06/2023]
Abstract
Platinum‐based chemotherapy is not standard of care for unselected or genetically selected metastatic castration‐resistant prostate cancer (mCRPC) patients. A retrospective assessment of 71 patients was performed on platinum use in the Netherlands. Genetically unselected patients yielded low response rates. For a predefined subanalysis of all patients with comprehensive next‐generation sequencing, 30 patients were grouped based on the presence of pathogenic aberrations in genes associated with DNA damage repair (DDR) or aggressive variant prostate cancer (AVPC). Fourteen patients (47%) were DDR deficient (DDRd), of which seven with inactivated BRCA2 (BRCA2mut). Six patients classified as AVPC. DDRd patients showed beneficial biochemical response to carboplatin, largely driven by all BRCA2mut patients having >50% prostate‐specific antigen (PSA) decline and objective radiographic response. In the wild‐type BRCA2 subgroup, 35% had a >50% PSA decline (P = .006) and 16% radiographic response (P < .001). Median overall survival was 21 months for BRCA2mut patients vs 7 months (P = .041) for those with functional BRCA2. AVPC patients demonstrated comparable responses to non‐AVPC, including a similar overall survival, despite the poor prognosis for this subgroup. In the scope of the registration of poly‐(ADP)‐ribose polymerase inhibitors (PARPi) for mCRPC, we provide initial insights on cross‐resistance between PARPi and platinum compounds. By combining the literature and our study, we identified 18 patients who received both agents. In this cohort, only BRCA2mut patients treated with platinum first (n = 4), responded to both agents. We confirm that BRCA2 inactivation is associated with meaningful responses to carboplatin, suggesting a role for both PARPi and platinum‐based chemotherapy in preselected mCRPC patients. What's new? Platinum‐based chemotherapy is not standard of care for unselected or genetically‐selected patients with metastatic castration‐resistant prostate cancer (mCRPC). However, several studies have shown that platinum‐based chemotherapy may still have a role in postponing progression in selected patient groups. This new study investigating DNA damage repair gene alterations and response to platinum‐based chemotherapy provides evidence that deep and durable responses are primarily associated with patients harbouring BRCA2 inactivation. Based on these data and the limited available literature, platinum‐based chemotherapy followed by PARP inhibition is potentially emerging as the optimal treatment sequence in pre‐selected mCRPC patients.
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Affiliation(s)
- Peter H J Slootbeek
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marleen L Duizer
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Maarten J van der Doelen
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands.,Department of Urology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Iris S H Kloots
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Malou C P Kuppen
- Institute for Medical Technology Assessment (iMTA), Erasmus School of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - Hans M Westgeest
- Department of Internal Medicine, Amphia Hospital, Breda, The Netherlands
| | - Carin A Uyl-de Groot
- Institute for Medical Technology Assessment (iMTA), Erasmus School of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - Samhita Pamidimarri Naga
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands.,Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marjolijn J L Ligtenberg
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands.,Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Inge M van Oort
- Department of Urology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Winald R Gerritsen
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jack A Schalken
- Department of Experimental Urology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Leonie I Kroeze
- Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Haiko J Bloemendal
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Niven Mehra
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
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