Abstract 4111
Background
Molecular heterogeneity drives tumour evolution and resistance to therapies. Because of biopsy challenges in non-small cell lung cancer (NSCLC), few studies compared the molecular profile between primary tumour (PT) and metastasis (Met). Here, we compare somatic single-nucleotide variants (SNVs), tumour mutational burden (TMB) and expression profiles between PT and matched metachronous Met in NSCLC patients (pts).
Methods
DNA and RNA were extracted from 14 matched fresh-frozen samples and PBMCs from 7 pts treated at the Institut d’Oncologie Thoracique (Gustave Roussy, GR) between 2011 and 2015. GATK4 Mutect2 were used for SNV calling and TMB on whole exome sequencing. Salmon was used for expression counts from RNAseq; Z-scores were computed by comparing data to 158 other NSCLC RNAseq from GR molecular profiling trials; GSVA R package was use to assess single sample gene set enrichment score (ssGSEA).
Results
Median age was 67 yo (62-78); 4/7 metastases were biopsied after chemotherapy; histology was adenocarcinoma (6) or large cell carcinoma (1). The median number of SNVs unique to PT or Met was 50 (10-143) or 79 (36-324), respectively; it was 65 (0-110) for shared SNVs; 6/7 pts had known driver alterations (TP53, KRAS, PIK3CA) in both lesions; one Met acquired a pathogenic KRAS G35C mutation. Median TMB was 3.9 (0.3-4.3) in PT and 4.1 (2.2-8.4) in Met. Genes with top negative Z-scores (MRFAP1, EP400, RIOX1, DDX27) were shared between PT and Met in 6/7 pts; genes with top positive Z-score were unique. ssGSEA-enriched genesets were shared between PT and Met; top enriched hallmarks included Myc targets, Mitotic Spindle, DNA repair, oxidative phosphorylation and TGFb signaling.
Conclusions
Matched comparison of molecular profiles between PT and Met evidence shared and unique alterations; this informs on tumor evolution and may help guiding treatment choice.
Clinical trial identification
Editorial acknowledgement
AK: AK was funded by the DUERTECC Gustave Roussy program
LCD: LCD was funded by the INSERM ATIP-Avenir grant from SPV
Legal entity responsible for the study
Sophie Postel-Vinay.
Funding
Cancéropole d’Ile de France.
Disclosure
A Kawachi: Funded by the DUERTECC Gustave Roussy program. L. Colmet-Daage: Funded by the INSERM ATIP-Avenir grant from SPV. L. Verlingue: Honoraria (self): Adaptherapy; Research grant / Funding (self): Bristol-Myers Squibb. D. Planchard: Honoraria (self): AstraZeneca; Honoraria (self): Bristol-Myers Squibb; Honoraria (self): Boehringer Ingelheim; Honoraria (self): Celgene; Honoraria (self): Eli Lilly; Honoraria (self): Merck; Honoraria (self): Novartis; Honoraria (self): Pfizer; Honoraria (self): prIME Oncology; Honoraria (self): Peer CME; Honoraria (self): Roche; Travel / Accommodation / Expenses: AstraZeneca; Travel / Accommodation / Expenses: Bristol-Myers Squibb; Travel / Accommodation / Expenses: Boehringer Ingelheim ; Travel / Accommodation / Expenses: Roche; Travel / Accommodation / Expenses: Merck; Travel / Accommodation / Expenses: Novartis; Travel / Accommodation / Expenses: prIME Oncology; Travel / Accommodation / Expenses: Pfizer. A. Hollebecque: Research grant / Funding (institution): AstraZeneca; Research grant / Funding (institution): BMS; Research grant / Funding (institution): Boehringer Ingelheim; Research grant / Funding (institution): Janssen Cilag; Research grant / Funding (institution): Merck; Research grant / Funding (institution): Novartis; Research grant / Funding (institution): Pfizer; Research grant / Funding (institution): Roche; Research grant / Funding (institution): Sanofi. C. Massard: Research grant / Funding (self): AstraZeneca; Research grant / Funding (self): BMS; Research grant / Funding (self): Boehringer Ingelheim; Research grant / Funding (self): Janssen Cilag; Research grant / Funding (self): Merck, Novartis; Research grant / Funding (self): Pfizer; Research grant / Funding (self): Roche; Research grant / Funding (self): Sanofi; Advisory / Consultancy: Amgen; Advisory / Consultancy: Astellas; Advisory / Consultancy: AstraZeneca; Advisory / Consultancy: Bayer; Advisory / Consultancy: BeiGene; Advisory / Consultancy: BMS; Advisory / Consultancy: Celgene; Advisory / Consultancy: Debiopharm; Advisory / Consultancy: Genentech; Advisory / Consultancy: Ipsen; Advisory / Consultancy: Janssen; Advisory / Consultancy: Lilly. B. Besse: Research grant / Funding (self): Abbvie; Research grant / Funding (self): Amgen; Research grant / Funding (self): AstraZeneca; Research grant / Funding (self): Biogen; Research grant / Funding (self): Blueprint Medicines; Research grant / Funding (self): BMS; Research grant / Funding (self): Celgene; Research grant / Funding (self): Eli Lilly; Research grant / Funding (self): GSK; Research grant / Funding (self): Ignyta; Research grant / Funding (self): IPSEN; Research grant / Funding (self): Merck KGaA; Research grant / Funding (self): MSD; Research grant / Funding (self): Nektar; Research grant / Funding (self): Onxeo; Research grant / Funding (self): Pfizer; Research grant / Funding (self): Pharma Mar; Research grant / Funding (self): Sanofi; Research grant / Funding (self): Spectrum Pharmaceuticals; Research grant / Funding (self): Takeda. J. Soria: Advisory / Consultancy: AstraZeneca; Advisory / Consultancy: Astex; Advisory / Consultancy: Clovis; Advisory / Consultancy: GSK; Advisory / Consultancy: GamaMabs; Advisory / Consultancy: Lilly; Advisory / Consultancy: MSD; Advisory / Consultancy: Mission Therapeutics; Advisory / Consultancy: Merus; Advisory / Consultancy: Pfizer; Advisory / Consultancy: PharmaMar; Advisory / Consultancy: Pierre Fabre; Advisory / Consultancy: Roche/Genentech; Advisory / Consultancy: Sanofi; Advisory / Consultancy: Servier; Advisory / Consultancy: Symphogen; Advisory / Consultancy: Takeda; Full / Part-time employment: AstraZeneca. S. Postel Vinay: Research grant / Funding (self): AstraZeneca; Research grant / Funding (self): BMS; Research grant / Funding (self): Boehringer Ingelheim; Research grant / Funding (self): Janssen Cilag; Research grant / Funding (self): Merck; Research grant / Funding (self): Novartis; Research grant / Funding (self): Pfizer; Research grant / Funding (self): Roche; Research grant / Funding (self): Sanofi. All other authors have declared no conflicts of interest.
Resources from the same session
2963 - Analytical performance of the Resolution-HRD plasma assay used to identify mCRPC patients with biallelic disruption of DNA repair genes for treatment with niraparib
Presenter: Ira Pekker
Session: Poster Display session 3
Resources:
Abstract
3523 - Results of a global external quality assessment scheme for EGFR testing on liquid biopsy
Presenter: Nicola Normanno
Session: Poster Display session 3
Resources:
Abstract
3295 - Clinical impact of plasma Next-Generation Sequencing (NGS) in advanced Non-small cell lung cancer (aNSCLC)
Presenter: Laura Bonanno
Session: Poster Display session 3
Resources:
Abstract
5632 - Feasibility study of a ctEGFR prototype assay on the fully automated Idylla™ platform
Presenter: Martin Reijans
Session: Poster Display session 3
Resources:
Abstract
3614 - Enhanced Access to EGFR Molecular Testing in NSCLC using a Cell-Free DNA Tube for Liquid Biopsy
Presenter: Theresa May
Session: Poster Display session 3
Resources:
Abstract
5664 - Analysis of circulating tumor DNA in paired plasma and sputum samples of EGFR-mutated NSCLC patients
Presenter: Christina Grech
Session: Poster Display session 3
Resources:
Abstract
4945 - Liquid biopsy and Array Comparative Genomic Hybridization (aCGH)
Presenter: Panagiotis Apostolou
Session: Poster Display session 3
Resources:
Abstract
5746 - Next-generation sequencing panel verification to detect low frequency single nucleotide and copy number variants from mixing cell line studies
Presenter: Rocio Rosas-Alonso
Session: Poster Display session 3
Resources:
Abstract
5901 - Automated rarefaction analysis for precision B and T cell receptor repertoire profiling from peripheral blood and FFPE-preserved tumor
Presenter: Luca Quagliata
Session: Poster Display session 3
Resources:
Abstract
2027 - A Heptamethine cyanine dye is a potential diagnostic marker for Myeloid-Derived Suppressor Cells
Presenter: Chaeyong Jung
Session: Poster Display session 3
Resources:
Abstract