Abstract 1617P
Background
We determined the performance of a multi-gene copy number variation (CNV) risk score in tissue and plasma cell-free DNA (cfDNA) biospecimens obtained in treatment- naïve metastatic castrate-resistant prostate cancer (mCRPC) patients to predict survival outcomes.
Methods
Metastatic tissue and cfDNA biospecimen sequencing results for CNV gains in AR, MYC, COL22A1, PIK3CA, PIK3CB, NOTCH1 and losses in TMPRSS2, NCOR1, ZPTB18, TP53, NKX3-1 from three independent treatment-naïve mCRPC cohorts (dbGaP, SU2C/PCF and the Vancouver Prostate Centre-University of British Columbia-VPC/BC) were used to to calculate a multi-gene weighted CNV risk score in all cohorts. Survival outcomes included overall survival (OS) and progression free survival (PFS) to first-line abiraterone-acetate/prednisone (AA/P) or enzalutamide (E) therapies adminsitered as mCRPC treatment in a specific cohort. The range of the risk scores obtained in each cohort was dichotomized at the median into a “high-risk” score (above median) and “low-risk” score (below median) and association with OS/PFS performed. Univariate and multi-variate Cox Proportional Hazard Regressions were applied for survival analyses (P<0.05 for significance).
Results
Of 1137 metastatic tissue-cfDNA biospecimens, 662/1137 were treatment-naive for mCRPC therapies and 311 were matched metastatic tissue - cfDNA pairs. The table summarizes results of comparisons between “high” and “low-risk” scores and survivals in each cohort. Pts with high-risk scores derived from metastatic tissue or cfDNA in all cohorts at the univariate and multi-variate level had the shortest OS. High risk scores also had shorter time to response to first-line AA/P and E therapies. Table: 1617P
Risk-score based survival in each independent cohort
| Range of CNV risk score in the cohort(Median) | Number of high risk vs low risk patients (pts) per cohort(N) | Median OS for high vs low risk (Months)(P-value) | Median PFS for high vs low risk scores for AA/P or E (Months)(P-value) | |
| dbGaP metastatic tissue cohort (N=68) | -0.11 to 4.01 (0.37) | 30 vs 38 | 24.9 vs 30.6 P=0.039 | For AA/P 7.8 vs 14 (P=0.0064) |
| SU2C/PCF metastatic tissue cohort (N=98) | -0.35 to 4.11 (2.23) | 49 vs 49 | 22.2 vs 33.7 P=0.003 | Not applicable |
| VPC/BC cfDNA cohort (N=311) | 0 - 9.4 (0) | First-line AA/P (N=137 pts) 51 vs 86 First-line E (N=174 pts)71 vs 103 | 15.5 vs 38.8 PConclusionsA multi-gene CNV risk score predicts survival outcomes and therapy responses to first-line AA/P and E in treatment-naive mCRPC patients and can be used for designing future enrichment type clinical trials. Clinical trial identificationPROMOTE (Prostate Cancer Medically-Optimized Genome-Enhanced Therapy), NCT01953640. Editorial acknowledgementLegal entity responsible for the studyManish Kohli. FundingHas not received any funding. DisclosureM. Kohli: Non-Financial Interests, Personal, Non remunerated activity, Travel only: Triomics Inc.; Non-Financial Interests, Personal, Non remunerated activity, Non-compensated: Nferene Inc. C. Maurice-Dror: Financial Interests, Personal, Financially compensated role, Advisory board/Honoraria/Travel: Jansen, Merck; Financial Interests, Personal, Financially compensated role, Honoraria/Travel: Pfizer; Financial Interests, Personal, Advisory Board: Eisai; Financial Interests, Personal, Financially compensated role: Biomica. A.W. Wyatt: Financial Interests, Personal, Advisory Board: AstraZeneca, Bayer, Pfizer, Merck, Janssen, EMD Serono; Financial Interests, Institutional, Research Funding: ESSA Pharma, Tyra Biosciences. B. Schmidt: Financial Interests, Personal, Advisory Board: ImmunityBio. All other authors have declared no conflicts of interest. Resources from the same session1658TiP - The STAMPEDE2 177Lutetium-PSMA-617 (177Lu-PSMA-617) trial: A phase III, randomised, open-label trial in patients with metastatic prostate cancer (mPC) starting androgen deprivation therapy (ADT)Presenter: Minal Padden-Modi Session: Poster session 11 1659TiP - A phase I, first-in-human, open-label, multicenter, trial-in-progress of the safety, tolerability, and preliminary efficacy of JNJ-87189401 (PSMA-CD28 bispecific antibody) combined with JNJ-78278343 (KLK2-CD3 bispecific antibody) for advanced prostate cancerPresenter: Mark Stein Session: Poster session 11 1660TiP - First-in-human study of ABBV-969, a dual variable antibody-drug conjugate (ADC), in patients (pts) with metastatic castration-resistant prostate cancer (mCRPC)Presenter: Raanan Berger Session: Poster session 11 1661TiP - SEGNO: An exploratory study of the safety and efficacy of genomic biomarker-guided neoadjuvant therapy for locally advanced and oligometastatic prostate cancerPresenter: Haichao Huang Session: Poster session 11 1662TiP - HARMONY: A phase II study of niraparib (N)/abiraterone acetate (AA) plus prednisone (P) for Hispanic/Latino (HL) and non-Hispanic Black (NHB) patients (pts) with metastatic hormone sensitive prostate cancer (mHSPC) and deleterious homologous recombination repair alterations (HRRa)Presenter: Qian Qin Session: Poster session 11 1664P - Early integration of psycho-oncology in cancer care: A model of care from a quaternary care government hospital in India and its patient related outcomesPresenter: Niharika Bisht Session: Poster session 11 1665P - Awareness of illness, psychological difficulties, and resources across life ages in early stage and metastatic cancer patientsPresenter: Raffaela Sartori Session: Poster session 11 1666P - Impact of substance use and mental health disorders on cancer care in urban underserved communitiesPresenter: Eunhee Choi Session: Poster session 11 This site uses cookies. Some of these cookies are essential, while others help us improve your experience by providing insights into how the site is being used. For more detailed information on the cookies we use, please check our Privacy Policy.
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