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Graham LS, True LD, Gulati R, Schade GR, Wright J, Grivas P, Yezefski T, Nega K, Alexander K, Hou WM, Yu EY, Montgomery B, Mostaghel EA, Matsumoto AA, Marck B, Sharifi N, Ellis WJ, Reder NP, Lin DW, Nelson PS, Schweizer MT. Targeting backdoor androgen synthesis through AKR1C3 inhibition: A presurgical hormonal ablative neoadjuvant trial in high-risk localized prostate cancer. Prostate 2021; 81:418-426. [PMID: 33755225 PMCID: PMC8044035 DOI: 10.1002/pros.24118] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/27/2021] [Accepted: 03/09/2021] [Indexed: 12/15/2022]
Abstract
BACKGROUND Localized prostate cancers (PCs) may resist neoadjuvant androgen receptor (AR)-targeted therapies as a result of persistent intraprostatic androgens arising through upregulation of steroidogenic enzymes. Therefore, we sought to evaluate clinical effects of neoadjuvant indomethacin (Indo), which inhibits the steroidogenic enzyme AKR1C3, in addition to combinatorial anti-androgen blockade, in men with high-risk PC undergoing radical prostatectomy (RP). METHODS This was an open label, single-site, Phase II neoadjuvant trial in men with high to very-high-risk PC, as defined by NCCN criteria. Patients received 12 weeks of apalutamide (Apa), abiraterone acetate plus prednisone (AAP), degarelix, and Indo followed by RP. Primary objective was to determine the pathologic complete response (pCR) rate. Secondary objectives included minimal residual disease (MRD) rate, defined as residual cancer burden (RCB) ≤ 0.25cm3 (tumor volume multiplied by tumor cellularity) and elucidation of molecular features of resistance. RESULTS Twenty patients were evaluable for the primary endpoint. Baseline median prostate-specific antigen (PSA) was 10.1 ng/ml, 4 (20%) patients had Gleason grade group (GG) 4 disease and 16 had GG 5 disease. At RP, 1 (5%) patient had pCR and 6 (30%) had MRD. Therapy was well tolerated. Over a median follow-up of 23.8 months, 1 of 7 (14%) men with pathologic response and 6 of 13 (46%) men without pathologic response had a PSA relapse. There was no association between prostate hormone levels or HSD3B1 genotype with pathologic response. CONCLUSIONS In men with high-risk PC, pCR rates remained low even with combinatorial AR-directed therapy, although rates of MRD were higher. Ongoing follow-up is needed to validate clinical outcomes of men who achieve MRD.
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Affiliation(s)
- Laura S Graham
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Lawrence D True
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Roman Gulati
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - George R Schade
- Department of Urology, University of Washington, Seattle, Washington, USA
| | - Jonathan Wright
- Department of Urology, University of Washington, Seattle, Washington, USA
| | - Petros Grivas
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Todd Yezefski
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Katie Nega
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Katerina Alexander
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Wen-Min Hou
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Evan Y Yu
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Bruce Montgomery
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Geriatric Research Education and Clinical Care, VA Puget Sound Health Care System, Seattle, Washington, USA
| | - Elahe A Mostaghel
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
- Geriatric Research Education and Clinical Care, VA Puget Sound Health Care System, Seattle, Washington, USA
| | - Alvin A Matsumoto
- Geriatric Research Education and Clinical Care, VA Puget Sound Health Care System, Seattle, Washington, USA
| | - Brett Marck
- Geriatric Research Education and Clinical Care, VA Puget Sound Health Care System, Seattle, Washington, USA
| | - Nima Sharifi
- Genitourinary Malignancies Research Center, Cleveland Clinic, Cleveland, Ohio, USA
| | - William J Ellis
- Department of Urology, University of Washington, Seattle, Washington, USA
| | - Nicholas P Reder
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | - Daniel W Lin
- Department of Urology, University of Washington, Seattle, Washington, USA
| | - Peter S Nelson
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Michael T Schweizer
- Division of Oncology, Department of Medicine, University of Washington, Seattle, Washington, USA
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
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