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Rosario García Campelo



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    MA 15 - Lung Cancer Biology II (ID 670)

    • Event: WCLC 2017
    • Type: Mini Oral
    • Track: Biology/Pathology
    • Presentations: 1
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      MA 15.01 - LungBEAM: A Prospective Multicenter Trial to Monitor EGFR Mutations Using BEAMing Technology in Stage IV NSCLC Patients (ID 10145)

      15:45 - 17:30  |  Author(s): Rosario García Campelo

      • Abstract
      • Presentation
      • Slides

      Background:
      Liquid biopsy is a promising approach to improve the management of NSCLC patients, offering a minimally-invasive alternative to tumor tissue testing and enabling timely monitoring of patients on-therapy. The goal of the present study was to evaluate the performance of the OncoBEAM EGFR plasma vs EGFR tissue testing across 19 Spanish hospitals and to examine the timing of T790M mutation emergence in patients during first-line EGFR TKI therapy with respect to radiological progression.

      Method:
      Blood samples from 112 therapy-naïve advanced NSCLC patients were collected at baseline and throughout EGFR TKI therapy. Results from OncoBEAM EGFR mutation were performed by Sysmex in Hamburg, Germany and then compared to those obtained by the initial EGFR tissue testing obtained at the referring hospital. In addition, the time at which T790M was first detected was compared to the date of progression determined by radiological imaging.

      Result:
      112 stage IV NSCLC patients (p) were enrolled between Nov 2016 and May 2017. Clinical characteristics: median age 65 y. , 81 female. Smoking pattern: never 70 p (62,5%), former 33 p (29.4%) and active 9 (8%). M1a 28 p (25%), M1b only brain 10 p (8.9%), only bone 17 p (15%). Baseline tissue samples: Exon 19 deletion 74 p (66%) , L858R 38 p (34%). Initial positive percent agreement (PPA) in 69 out of 112 p was 52/69 or 75.4%. Interestingly, the agreement between plasma and tissue EGFR mutation results for patients diagnosed at M0 was 56%, versus 81% with patients diagnosed at M1. In addition, the average number of days between tissue biopsy and blood collection for concordant cases was 128 days, versus 358 days for discordant cases. Currently, the tissue EGFR mutation status of all discordant cases is being re-examined using BEAMing. Preliminary results from serial T790M plasma analyses revealed cases where detection by OncoBEAM was observed several weeks prior to documented progression by imaging. More mature results will be available at the time of the meeting

      Conclusion:
      Overall, these initial results show high PPA of plasma and tissue EGFR mutation status at baseline. Moreover, early detection of T790M in blood may assist in anticipating resistance to first-line EGFR TKI therapy.

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    P1.01 - Advanced NSCLC (ID 757)

    • Event: WCLC 2017
    • Type: Poster Session with Presenters Present
    • Track: Advanced NSCLC
    • Presentations: 1
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      P1.01-040 - Clinical Utility of Plasma-Based NGS for Advanced-Stage NSCLC Patients with Insufficient or Unavailable Tumor Tissue (ID 10215)

      09:30 - 16:00  |  Author(s): Rosario García Campelo

      • Abstract
      • Slides

      Background:
      The failure rate of tissue-based NGS in newly diagnosed NSCLCs is approximately 20-25 %, reaching 40 % in the case of tumor biopsy samples collected at disease progression. In this study, we are analyzing the clinical utility of plasma-based NGS using cell-free circulating tumor DNA (ctDNA) for advanced-stage lung adenocarcinoma patients, as a complement or alternative to tissue-based molecular profiling.

      Method:
      Eight Academic Spanish Institutions are participating in patient recruitment. We are stratifying patients in three cohorts: 1) Patients with advanced-stage lung adenocarcinomas with insufficient tumor tissue for EGFR, ALK or ROS1 analysis; 2) Patients with EGFR, ALK or ROS1 altered tumors with acquired TKI resistance; 3) Patients with EGFR T790M positive cancers progressing on third generation EGFR TKIs. Next-generation ctDNA sequencing is being performed using GUARDANT360 73-gene panel at a CLIA certified central laboratory facility (Redwood City, California). We are stratifying gene variant actionability into four levels according to the OncoKB website criteria.

      Result:
      We have currently included 97 patients (January-June 2017). Complete clinical and molecular data are available at present for the first 37 patients. Twelve, 19 and 6 patients have been enrolled in cohorts 1, 2 and 3 respectively. Never smoker patients were overrepresented (n = 21, 56 %), predominantly at cohorts 2 and 3. A total of 30 cases (81 %) had detectable ctDNA. We have detected potentially actionable genetic alterations involved in mitogenic pathways in 16 patients (43 %). Level 1 alterations (variants with matched approved drugs) were found in three patients’ tumors (25 %) from cohort 1 (two EGFR sensitizing mutations and one ROS1 rearrangement). Nine patients (36 %) from cohort 2 and 3 had tumors with potentially targetable acquired genetic alterations, including three cases with EGFR T790M mutations and one case with a ROS1 kinase domain mutation. Six patients (16 %) received matched targeted therapies, four (11 %) in genotype-driven clinical trials. Reasons for not receiving matched targeted therapies in patients with actionable tumors were clinical deterioration or death (n = 2), unavailability of matched clinical trials (n = 6), treatment with non-genotype-tailored therapies (n =1) or no disease progression to ongoing therapies (n =1). Final clinical and molecular data of the whole cohort will be provided at the meeting.

      Conclusion:
      On the basis of our preliminary data, next-generation ctDNA sequencing (GUARDANT 360) appears to detect actionable genetic alterations when tissue is unavailable, avoiding multiple biopsies and enabling rapid patient selection for genotype-tailored therapies.

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    P3.01 - Advanced NSCLC (ID 621)

    • Event: WCLC 2017
    • Type: Poster Session with Presenters Present
    • Track: Advanced NSCLC
    • Presentations: 1
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      P3.01-073 - TPX-0005 with an EGFR Tyrosine Kinase Inhibitor (TKI) Overcomes Innate Resistance in EGFR Mutant NSCLC (ID 8956)

      09:30 - 16:00  |  Author(s): Rosario García Campelo

      • Abstract
      • Slides

      Background:
      Overexpression of several receptor tyrosine kinases (RTKs) substitutes EGFR signaling in EGFR-mutant NSCLC. The MET ligand hepatocyte growth factor (HGF) provides an alternative signaling mechanism for EGFR by inducing inter-receptor cross talk with EphA2, CUB domain-containing protein-1 (CDCP1) or AXL. SHP2, a non-receptor protein tyrosine phosphatase is central in signal transduction downstream of RTK signaling and in Src activation. We previously demonstrated that STAT3 and Src-YAP1 signaling limits EGFR TKI efficacy in EGFR-mutant NSCLC. We are now exploring the possibility of multiple RTK activation through a Src-YAP1-mediated transcriptional program. We are evaluating whether combined EGFR inhibition with TPX-0005, a novel orally available multikinase inhibitor and potent Src/FAK and JAK2 inhibitor, can be more efficient than EGFR inhibition alone in EGFR-mutant NSCLC cells.

      Method:
      We studied the mRNA expression levels of stromal HGF and tumor RTKs, AXL, CDCP1, MET, and EphA2, as well as SHP2, and clinical outcome in baseline samples of 64 EGFR-mutant NSCLC patients treated with first-line EGFR TKI. We combined in vitro approaches to explore whether gefitinib or osimertinib combined with TPX-0005 can abolish STAT3 and Src-YAP1 and downregulate the expression of RTKs.

      Result:
      High levels of AXL, CDCP1 and SHP2 mRNA expression were associated with worse outcome to EGFR TKI in 64 EGFR-mutant NSCLC patients. Median progression-free survival (PFS) was 14.5 and 23.4 months for patients with high and low AXL mRNA, respectively (p=0.0359). Median PFS was 9.1 and 20.2 months for patients with high and low CDCP1 mRNA, respectively (p=0.0179). Tumoral EPHA2 and MET or stromal HGF levels did not affect PFS. Median PFS was 11.4 and 24.1 months for patients with high and low SHP2 mRNA, respectively (p=0.0094). The combination of gefitinib/osimertinib with TPX-0005 resulted in highly synergistic suppression of cell viability and reduced colony formation in two EGFR-mutant cell lines. The combination abolished the EGFR inhibition-induced STAT3 and YAP1 phosphorylation, as confirmed by western blotting and immunofluorescence. The results of TaqMan quantitative-PCR assay revealed that gefitinib/osimertinib plus TPX-0005 reduced the mRNA levels of AXL, CDCP1 and MET, an effect that could not be obtained with EGFR inhibition alone. In vivo experiments are ongoing.

      Conclusion:
      AXL and CDCP1 are adverse predictive markers of PFS in EGFR-mutant NSCLC patients. STAT3 and Src-YAP1 signaling limits the efficacy EGFR TKI. Combined EGFR inhibition with TPX-0005 (currently in phase I clinical testing) is a particularly attractive strategy

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