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M.F. Berger



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    MO13 - SCLC I (ID 118)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Medical Oncology
    • Presentations: 1
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      MO13.10 - Prospective Molecular Evaluation of Small Cell Lung Cancer (SCLC) Utilizing the Comprehensive Mutation Analysis Program at Memorial Sloan-Kettering Cancer Center (MSKCC) (ID 3137)

      10:30 - 12:00  |  Author(s): M.F. Berger

      • Abstract
      • Presentation
      • Slides

      Background
      Oncogenic events in adenocarcinoma and squamous cell cancers of the lung are well described. In contrast, the repertoire of possible molecular targets in SCLC still is unclear. Recent studies using next generation sequencing on rare resected SCLC specimens have provided insights into the molecular heterogeneity of this disease. Comprehensive, prospective molecular profiling of patients with SCLC using the biopsy specimens available in clinical practice has not been performed.

      Methods
      Utilizing an IRB-approved protocol to prospectively test SCLC tumors (Small Cell Lung Cancer Mutation Analysis Program, “SCLC-MAP”), these biopsies are evaluated by: FISH for FGFR1 and MET amplification; immunohistochemistry (IHC) for MGMT and PTEN loss; point mutation genotyping with Sequenom for PIK3CA (and others); and next-generation sequencing with our MSK-IMPACT assay (Integrated Mutation Profiling of Actionable Cancer Targets). MSK-IMPACT uses exon capture followed by massively parallel sequencing to profile all protein-coding exons and select introns of 279 cancer-associated genes, enabling the identification of mutations, indels, and copy number alterations of these genes. First, we tested the feasibility of this approach in a series of SCLC patients that were identified retrospectively as they had banked matched tumor and normal pairs. We performed next generation sequencing with MSK-IMPACT, with findings confirmed by FISH on these samples. We are prospectively collecting and evaluating SCLC tumors of our patients in active treatment, as detailed above.

      Results
      For our feasibility cohort, we identified 21 patients with SCLC with FFPE samples available from both matched normal tissue and small tumor biopsies. After histologic review and DNA extraction, 10 patients had adequate tissue for MSK-IMPACT (3 core biopsies, 7 fine needle aspirates). The following were noted: recurrent mutations in Rb1 (N=7) and p53 (N=8), FGFR1 amplification (N=2), and MET amplification (N=1), using as little as 15 nanograms of DNA. FGFR1 and MET amplification were confirmed by FISH testing. We have initiated this prospective SCLC-MAP program for our SCLC patients undergoing active treatment. Since 2/2013, 25 patients have provided consent and tumor tissue for analysis (8 surgical resections, 12 core biopsies, 3 lymph node dissections, 2 fine needle aspirates). Preliminary data are available for 16 patients: AKT1 E17 mutation by Sequenom (N=1), MGMT loss by IHC (N=1); and PTEN loss by IHC (N=2).

      Conclusion
      As adequate biopsy specimens are necessary to match lung cancer patients and treatments, increased number of patients with SCLC are presenting with more tissue. Comprehensive molecular evaluation of SCLC is feasible on clinically available specimens, as seen in our feasibility cohort. Prospective collection of SCLC tumor samples and mutational analyses are ongoing. Such analyses will allow us to characterize the molecular diversity of this disease and identify patients who will be candidates for targeted therapies. Funded, in part, by the Lung Cancer Research Foundation.

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    MO16 - Prognostic and Predictive Biomarkers IV (ID 97)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Medical Oncology
    • Presentations: 1
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      MO16.09 - Patterns of metastasis and survival in patients with PI3K-aberrant and FGFR1 amplified stage IV squamous cell lung cancers (SQCLCs) (ID 1666)

      16:15 - 17:45  |  Author(s): M.F. Berger

      • Abstract
      • Presentation
      • Slides

      Background
      The majority of actionable drivers in SQCLCs occur in the PI3K (30%) and FGFR1 (20%) pathways. The biologic behaviors and natural histories of these subtypes are not well characterized. Characterization of these data may help to elucidate the biologic relevance of these putative oncogenic events.

      Methods
      As of October 2011, all patients with SQCLCs at MSK have undergone prospective, multiplex testing of their FFPE tumors for FGFR1 amplification (FISH, FGFR1:CEP8 ≥ 2.2), PIK3CA mutations (Sequenom and exon sequencing), PTEN loss (IHC, Cell Signaling), and PTEN mutations (exon sequencing), among others. The PI3K abberant group was defined as PIK3CA mutant, PTEN complete loss, or PTEN mutant. Patient characteristics, outcomes, and metastatic sites were identified. Survival probabilities were estimated using the Kaplan-Meier method. Group comparisons were performed with log-rank tests and Cox proportional hazards methods.

      Results
      77 stage IV SQCLC patients were analyzed. Genotypes were: FGFR1 amplified (23%); PTEN loss (22%), PIK3CA mutant (8%), PTEN mutant (7%). Events were non-overlapping save for 2 cases with PTEN nonsense mutations and PTEN loss. The sole significant clinical difference (KPS, age, sex, lines of tx, smoking status) was sex (women in PI3K group 52% vs. in others 23%, p=0.02). Metastatic patterns for PI3K and FGFR1 vs. all others were:

      Site PI3K p FGFR1 p Other Total
      Brain 6 (22%) 0.002 0 (0%) 0.6 0 (0%) 6 (7%)
      Pleura 5 (19%) 0.4 5 (28%) 0.7 9 (28%) 19 (25%)
      Liver 5 (19%) 0.4 1 (6%) 1 1 (3%) 7 (9%)
      Bone 8 (30%) 0.8 3 (17%) 0.7 10 (31%) 21 (27%)
      Lung 12 (44%) 0.8 10 (56%) 0.2 12 (38%) 34 (44%)
      Adrenal 3 (11%) 1 3 (17%) 1 4 (13%) 10 (13%)
      Pericardium 1 (4%) 1 1 (6%) 0.3 0 2 (3%)
      Median OS for PI3K vs. all others: 9mo (95%CI:8-NR) vs. 16mo (95%CI:11-NR), p=0.004. Median OS for FGFR1 vs. all others: 20mo (95%CI:11-NR) vs. 10mo (95%CI:9-16), p=0.06. Multivariate analysis for risk of death: PI3K HR=3.3 (95%CI:1.5-7, p=0.003); FGFR1 HR=0.5 (95%CI:0.2-1.1, p=0.06); Age ≥65, HR=1.3 (95%CI:0.6-2.8, p=0.5); KPS≤70, HR=3.2 (95%CI:1.6-.6.4, p<0.001); Lines of therapy ≥ 2, HR=2.3 (95%CI=0.8-5.7, p=0.08), male gender, HR=0.7 (95%CI:0.3-1.4, p=0.3).

      Conclusion
      Patients with stage IV PI3K-aberrant SQCLCs have poorer survival compared to other patients with SQCLCs while patients with FGFR1 amplified SQCLCs have a trend towards better survival. Brain metastases in SQCLC are rare, and occurred exclusively in patients with PI3K-aberrant tumors. These data suggest that PI3K pathway activation confers a distinct biology, and that targeting this in SQCLC patients with brain metastases may be an effective therapeutic strategy. Whole exome and RNA-sequencing data from 8 resected SQCLC brain metastases (4 paired with lung primaries) will be presented.

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