Author of

• 12769

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  P3.18 - Poster Session 3 - Pathology (ID 177)

  • Event: WCLC 2013
  • Type: Poster Session
  • Track: Pathology
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/30/2013, 09:30 - 16:30, Exhibit Hall, Ground Level

  • 12787

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    P3.18-018 - Results of upfront genomic testing in non-small cell lung cancer (NSCLC) patients (MSN study) (ID 3066)

    09:30 - 09:30  |  Author(s): D. Planchard
    • Abstract

    Background
    Recent advances in lung cancer have identified potential driver mutations that may be targeted. On the basis of routine screening for EGFR we have initiated a comprehensive large-scale sequencing analysis of genes potentially mutated in NSCLC.

    Methods
    Genomic DNA was extracted prospectively from untreated advanced NSCLC tumors. All materiel was obtained IRB-approved protocols and after patients’ consent (MSN trial "Melanoma – Small-cell lung cancer – Non-small cell lung cancer "). Pathology specimens were macrodissected, after DNA extraction, 106 selected exons from 38 genes were analyzed by Sanger sequencing (EGFR, KRAS, HER2,4, BRAF, PI3KCA, PIK3R1, TP53, CDK4, CDKN2A, cKIT, PDGFRA, MET, FGFR2-4, FCGR2A,3A, FLT3, CTNNB1, GNAS, HRAS, NRAS, KDR, PDPK1, TOP1,2A, ERCC1, FBXW7, TSC2, PTEN, AKT1-3, MAP2K1-2, STK11, ALK). ALK rearrangements and HER2 amplification were detected by FISH. All result therapeutic outcomes were discussed monthly in a molecular thoracic multidisciplinary staff.

    Results
    Thus far (between May 2009 and September 2012), 351 patients (pts) have been included. The median age was 60 years (range 22-87), 212 (60%) were male, 248 (71%) had adenocarcinoma, 286 (81%) were former/current smokers. A complete failure of the analysis was observed in 78 (22%) pts mostly due to insufficient tumor cells in the specimen (<30%) or poor quality DNA. EGFR, KRAS, HER2, BRAF, PI3CA and ALK (“standard biomarkers”), analysis were performed in 235 (67%), 233 (66%), 207(59%), 221(63%), 139 (40%) and 206 (59%) pts respectively. Depending of markers, success rate was between 77% and 86 % (failures include scarce tumor sample). Two hundred and sixty three pts had at least one result for the EGFR, KRAS or ALK, and 176 pts had all three. 107 pts had a whole genomic analysis and 244 had at least one (1-6 biomarkers) standard biomarkers analysis. Ten (3.8%) pts had concurrent oncogenic mutation. The molecular profiles were characterized by 16% EGFR, 26% KRAS, 1% HER2, 0.8% PI3KCA mutated, 7% HER2 amplification and 11% ALK rearrangement. The pts with the while genomic analysis had 12 other genes evaluated for more than 80 pts and 13 pts had mutation (STK11, PDPK1, PTEN, NRAS, MET, KDR, FGFR4, HER4). A personalized targeted therapy was proposed in most of pts with a genomic alteration. Median OS of pts with at least one mutation/translocation for EGFR, KRAS, BRAF or ALK (n=152) was 13 and 17 months (p=0.006) in wild type or mutated pts respectively. In univariate analysis for OS (median follow-up: 19 months), KRAS mutated pts had a poor prognosis (hazard ratio [HR]=1.56, p=0.037), confirmed in multivariate analysis (HR= 1.78, p=0.008), EGFR mutated pts had a good prognosis (HR=0.48, p=0.01), BRAF and ALK mutations/translocation had no prognostic value.

    Conclusion
    Routine mutational profiling of advanced NSCLC is feasible in the vast majority of the pts but an extensive molecular portrait can be performed only in a limited number of pts. The molecular profile may have an impact on pts treatment strategy at our cancer institute. KRAS mutation is associated with poor prognosis. Updated results will be presented.