Abstract 4727
Background
Limited data exist in the clonal dynamics of serial ctDNA as a predictive biomarker in advanced solid tumor pts receiving immune checkpoint blockade.
Methods
Pts with mixed solid tumors received single agent P (anti-PD-1) 200 mg IV Q3wks in the investigator-initiated phase II INSPIRE trial (NCT02644369). ctDNA was assayed at baseline (B) and start of cycle 3 (C3) using a pt-specific amplicon-based NGS assay (Signatera™). Samples were considered ctDNA positive if ≥ 2 of 16 pt-specific targets met the qualifying confidence score threshold.
Results
Of 94 pts are presented. Demographics: male 38%; median age=55 yrs (range 21–81); triple negative breast (19%), ovarian (19%) and head and neck (17%) cancers comprised the major malignancies. Median no. of P cycles=3 (range 1–35); follow up was 14m (range 0.6-35.4); RECIST responses: CR 3.2% (n = 3), PR 14% (n = 13), CBR (CR+PR+SD>6 cycles) 28% (n = 26), RECIST/clinical PD (n = 61/18; 65%/19%). Median PFS=2.5m and median OS = 14m. In all 94 pts, ctDNAB correlated with PFS (adjusted HR 0.53, 95% CI 0.34-0.84, p = 0.01) and OS (adjusted HR 0.47, 95% CI 0.28-0.8, p = 0.01). Among 74 pts with both ctDNAB and ctDNAC3, the change (ΔctDNA) correlated with clinical efficacy parameters (Table).Table: 113P
Endpoint | ORR N = 72* | CBR N = 72* | Endpoint | PFS N = 73* | OS N = 73* | ||||
---|---|---|---|---|---|---|---|---|---|
Subgroup | CR/PR N = 15 | SD/PD N = 57 | CR/PR/SD≥6 cycles N = 22 | CR/PR/SD<6 cycles N = 50 | Subgroup | ↑ from baseline N = 33 | ↓ from baseline N = 40 | ↑ from baseline N = 33 | ↓ from baseline N = 40 |
ΔctDNA (% change) | Median = -91.5% Range = -100% to 60% | Median = 40% Range = -98.4% to 2458% | Median = -75% Range = -100% to 96% | Median = 52% Range = -94.6% to 2458% | Results based on ΔctDNA | Median = 7.9m 6m = 51.5% | Median = 2.8m 6m = 10.0% | Median = not reached 6m = 91% 12m = 82% | Median = 9.1m 6m = 73% 12m = 45% |
P-value | P < 0.001 | P < 0.001 | Adjusted HR (95% CI)^ | 0.43 (0.25-0.75) P = 0.003 | 0.35 (0.18–0.67) P = 0.002 |
Adjustment on cohorts;
*2 pts were excluded from ORR/CBR analyses as baseline ctDNA = 0; 1 of these 2 pts (with PR) excluded from PFS/OS analyses as C3 ctDNA = 0
Conclusions
Strong correlations exist between both ctDNAB and ΔctDNA with clinical outcome, suggesting both prognostic and predictive values in pts with mixed solid tumors.
Clinical trial identification
NCT02644369, December 31, 2015.
Editorial acknowledgement
Legal entity responsible for the study
University Health Network, Toronto.
Funding
Merck, Netera, Terry Fox Research Institute, Princess Margaret Cancer Foundation.
Disclosure
S. Dashner: Shareholder / Stockholder / Stock options, Full / Part-time employment: Netera. A.R. Hansen: Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Merck; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): GlaxoSmithKline; Research grant / Funding (institution): Genentech/Roche; Research grant / Funding (institution): Bristol-Myers Squibb; Research grant / Funding (institution): Novartis; Research grant / Funding (institution): Boston Biomedical; Research grant / Funding (institution): Boehringer-Ingelheim; Research grant / Funding (institution): AstraZeneca/Medimmune; Research grant / Funding (institution): Janssen; Research grant / Funding (institution): Karyopharm. P. Bedard: Honoraria (institution), Advisory / Consultancy: Sanofi; Advisory / Consultancy, Research grant / Funding (institution): Roche/Genentech; Advisory / Consultancy, Research grant / Funding (institution): Bristol-Myers Squibb; Advisory / Consultancy, Research grant / Funding (institution): Pfizer; Research grant / Funding (institution): Novartis; Research grant / Funding (institution): GlaxoSmithKline; Research grant / Funding (institution): AstraZeneca/Medimmune; Research grant / Funding (institution): Merck; Research grant / Funding (institution): Nektar Therapeutics; Research grant / Funding (institution): Servier; Research grant / Funding (institution): Seattle Genetics; Research grant / Funding (institution): PTC Therapeutics; Research grant / Funding (institution): Oncothyreon. S. Lheureux: Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Merck; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): AstraZeneca/Medimmune; Research grant / Funding (institution): Roche/Genentech; Research grant / Funding (institution): Tesaro. A. Spreafico: Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Merck; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Bristol-Myers Squibb; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Novartis; Honoraria (self), Advisory / Consultancy: Oncorus; Research grant / Funding (institution): Symphogen; Research grant / Funding (institution): AstraZeneca/Medimmune; Research grant / Funding (institution): Bayer; Research grant / Funding (institution): Surface Oncology; Research grant / Funding (institution): Northern Biologics; Research grant / Funding (institution): Janssen; Research grant / Funding (institution): Oncology/Johnson & Johnson; Research grant / Funding (institution): Array Biopharma. A.A. Razak: Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Boehringer Ingelheim; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Eli Lilly; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Merck; Research grant / Funding (institution): CASI Pharmaceuticals; Research grant / Funding (institution): Novartis; Research grant / Funding (institution): Deciphera; Research grant / Funding (institution): Karyopharm Therapeutics; Research grant / Funding (institution): Pfizer; Research grant / Funding (institution): Roche/Genentech; Research grant / Funding (institution): Boston Biomedical; Research grant / Funding (institution): Bristol-Myers Squibb; Research grant / Funding (institution): AstraZeneca/Medimmune; Research grant / Funding (institution): Amgen; Research grant / Funding (institution): GlaxoSmithKline; Research grant / Funding (institution): Blueprint Medicines; Research grant / Funding (institution): Merck; Research grant / Funding (institution): Abbvie; Research grant / Funding (institution): Adaptimmune. H. Wu: Shareholder / Stockholder / Stock options, Full / Part-time employment: Netera. S. Shchegrova: Shareholder / Stockholder / Stock options, Full / Part-time employment: Netera. P.S. Ohashi: Honoraria (self), Advisory / Consultancy: Symphogen Inc; Honoraria (self), Advisory / Consultancy: Providence Therapeutics. M. Louie: Shareholder / Stockholder / Stock options, Full / Part-time employment: Netera. H. Sethi: Shareholder / Stockholder / Stock options, Full / Part-time employment: Netera. A. Aleshin: Shareholder / Stockholder / Stock options, Full / Part-time employment: Netera. L.L. Siu: Honoraria (self), Advisory / Consultancy: Merck; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Pfiser; Honoraria (self), Advisory / Consultancy: Celgene; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): AstraZeneca/Medimmune; Honoraria (self), Advisory / Consultancy: Morphosys; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Roche/Genentech; Honoraria (self), Advisory / Consultancy: GeneSeeq; Honoraria (self), Advisory / Consultancy: Loxo; Honoraria (self), Advisory / Consultancy: Oncorus; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Symphogen; Honoraria (self), Advisory / Consultancy: Seattle Genetics; Research grant / Funding (institution): Novartis; Research grant / Funding (institution): Bristol-Myers Squibb; Research grant / Funding (institution): Boerhinger-Ingelheim; Research grant / Funding (institution): GlaxoSmithKline; Research grant / Funding (institution): Karyopharm; Research grant / Funding (institution): Astellas; Research grant / Funding (institution): Bayer; Research grant / Funding (institution): Abbvie; Research grant / Funding (institution): Amgen; Research grant / Funding (institution): Intensity Therapeutics; Research grant / Funding (institution): Mirati; Research grant / Funding (institution): Shattucks; Spouse / Financial dependant: Agios. S. Bratman: Research grant / Funding (self): Nektar Therapeutics; Licensing / Royalties, Co-inventor of a patent relating to circulating tumor DNA detection technology: Roche Molecular Diagnostics. T.J. Pugh: Honoraria (self): Merck; Honoraria (self): Prosigna; Honoraria (self): Chrysalis Medical Advisors; Advisory / Consultancy: DynaCare; Research grant / Funding (self): Boehringer Ingelheim. All other authors have declared no conflicts of interest.
Resources from the same session
1707 - Clinical utility of precision immunoprofiling and monitoring of the tumor microenvironment using flow cytometry and CyTOF in patients with advanced NSCLC treated with atezolizumab: results from a phase II study for biomarker analysis (EPOC1702)
Presenter: Keisuke Kirita
Session: Poster Display session 3
Resources:
Abstract
3594 - Tumor mutation burden (TMB), PD-L1, IFN-γ signaling identify subgroups of patients (pts) who benefit from durvalumab (D, anti-PDL1) or D and tremelimumab (T, anti-CTLA4) treatment in urothelial bladder cancer (UC)
Presenter: Christophe Massard
Session: Poster Display session 3
Resources:
Abstract
744 - The decrease of TMB, TNB and HLA expression are the Mechanism of Drug Resistance of NSCLC to immunosuppressive PD-1/PD-l1.
Presenter: Sheng Yu
Session: Poster Display session 3
Resources:
Abstract
2350 - Eosinophilia during treatment of immune checkpoint inhibitors (ICIs) predicts succeeding onset of immune-related adverse events (irAEs)
Presenter: Rika Kizawa
Session: Poster Display session 3
Resources:
Abstract
5930 - A transcriptomic immunologic signature predicts favorable outcome in neoadjuvant chemotherapy treated triple negative breast tumors.
Presenter: Javier Pérez-peña
Session: Poster Display session 3
Resources:
Abstract
6127 - Alterations of TMB and TCR repertoires during Chemotherapy in East Asian lung cancer patients without TKI-related driver gene mutations
Presenter: Lele Song
Session: Poster Display session 3
Resources:
Abstract
1310 - Association of SCFA in gut microbiome and clinical response in solid cancer patients treated with andi-PD-1 antibody.
Presenter: Motoo Nomura
Session: Poster Display session 3
Resources:
Abstract
2286 - Extracellular matrix and tissue derived metabolites in a liquid biopsy identifies endotypes of metastatic melanoma patients with differential response to immune checkpoint inhibitor treatment
Presenter: Nicholas Willumsen
Session: Poster Display session 3
Resources:
Abstract
4107 - Pathologic scoring of pre-treatment H&E biopsies predicts overall survival in patients with metastatic clear cell renal cell carcinoma receiving nivolumab monotherapy
Presenter: Julie Stein
Session: Poster Display session 3
Resources:
Abstract
1291 - PD-L1 expression in uncommon EGFR-mutant non-small cell lung cancer and its response to immunotherapy
Presenter: Yun Fan
Session: Poster Display session 3
Resources:
Abstract