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Y.S. Choi



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    MO10 - Molecular Pathology II (ID 127)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Pathology
    • Presentations: 1
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      MO10.01 - Integrative and comparative genomic analysis of East-Asian lung squamous cell carcinomas (ID 2667)

      16:15 - 17:45  |  Author(s): Y.S. Choi

      • Abstract
      • Presentation
      • Slides

      Background
      Lung squamous cell carcinoma (SqCC) is the second most prevalent type of lung cancer. Currently, no targeted-therapeutics are approved for treatment of this cancer, largely due to a lack of systematic understanding of the molecular pathogenesis of the disease. To identify therapeutic targets and perform comparative analyses of lung SqCC, we probed somatic genome alterations of lung SqCC cases from Korean patients.

      Methods
      We performed whole-exome sequencing of DNA from 104 lung SqCC samples from Korean patients and matched normal DNA. In addition, copy number analysis and transcriptome analysis were conducted for a subset of these samples. Clinical association with cancer-specific somatic alterations was investigated.

      Results
      This cancer cohort is characterized by a very high mutational burden with an average of 261 somatic exonic mutations per tumor and a mutational spectrum showing a signature of cigarette-smoke exposure. Seven genes demonstrated statistical enrichment for mutation (TP53, RB1, PTEN, NFE2L2, KEAP1, MLL2 and PIK3CA). Comparative analysis between Korean and North American lung SqCC demonstrated similar spectrum of alterations in these two populations, in contrast to the differences seen in lung adenocarcinoma. We also uncovered recurrent occurrence of therapeutically actionable FGFR3-TACC3 fusion in lung SqCC.

      Conclusion
      These findings provide new steps towards the identification of genomic target candidates for precision medicine in lung SqCC, a disease with a significant unmet medical need.

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    P3.07 - Poster Session 3 - Surgery (ID 193)

    • Event: WCLC 2013
    • Type: Poster Session
    • Track: Surgery
    • Presentations: 1
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      P3.07-012 - Pulmonary Resection for Stage I Non-Small Cell Lung Cancer in Elderly Patients (ID 1282)

      09:30 - 16:30  |  Author(s): Y.S. Choi

      • Abstract

      Background
      With the increase in life expectancy, surgical treatment of non-small cell lung cancer (NSCLC) in elderly patients became more frequent. The aim of this study is to evaluate the risk factors for short and long-term outcomes after pulmonary resection in the elderly patients with stage I NSCLC.

      Methods
      From October 1994 to December 2011, the patients who were surgically treated with curative intent and pathologically diagnosed as stage I NSCLC were included. The patients were divided into two groups; elderly group (≥70 years) and younger group (<70 years). Comorbidity and surgical factors were analyzed for thirty-day mortality, hospital stay and overall survival in both groups.

      Results

      The Risk factors for short and long term outcome after pulmonary resection in elderly patients with stage I NSCLC
      Risk factor 30-day mortality (Pearson’s Chi-Square Test) Hospital stay (Linear Regression Model) 5-year survival (Cox Hazard Model)
      HR (95% CI) p-value HR (95% CI) p-value HR (95% CI) p-value
      DLCO less than 70% 12.9 (1.8-93.6) 0.001 5.0 (2.7-7.3) < 0.001 3.4 (1.5-8.0) 0.004
      FEV~1~/FVC less than 70% NS 2.5 (0.8-4.3) 0.005 NS
      Open thoracotomy NS 3.6 (2.3-4.8) < 0.001 NS
      Pulmonary tuberculosis NS NS 3.3 (1.5-7.5) 0.004
      Interstitial pulmonary fibrosis NS NS 5.0 (1.4-18.0) 0.015
      Creatinine higher than 1.5mg/dL NS NS 5.7 (1.3-25.3) 0.022
      Extensive resection NS NS 4.4 (1.4-14.0) 0.012
      Total 1,340 patients were enrolled and 285 patients (21.3%) were classified as the elderly group and 1,055 patients (78.7%) as the younger group. The thirty-day mortality was 8 of 1,340 patients (0.6%) and all of the patients were elderly. The only independent factor for thirty-day mortality in elderly group was diffusing capacity for carbon monoxide (DLCO) less than 70% of predicted (hazard ratio, 12.9; p = 0.001). The elderly group had significantly longer hospital stay (11.2 12.2 vs. 8.0 6.7 days, p < 0.001). Open thoracotomy (p < 0.001), DLCO less than 70% of predicted (p < 0.001) and percentage of one second forced expiratory volume over forced vital capacity (FEV~1~/FVC) less than 70% (p = 0.005) were significantly associated with longer hospital stay. In-hospital complication rate in elderly patients was also significantly higher (47.7 vs. 26.9%, p < 0.001). 5-year overall survival rates were 91.1% in the younger group and 66.2% in the elderly group. In the elderly group, previous history of tuberculosis (p = 0.004) and interstitial pulmonary fibrosis (IPF; p = 0.015), DLCO less than 70% of predicted (p = 0.004), preoperative creatinine higher than 1.5 mg/dL (p = 0.022), and more extensive pulmonary resection (p = 0.012) were the independent risk factors for overall survival. On the other hand, previous history of IPF (p < 0.001) and pathologic stage IB over IA (p < 0.001) were the independent risk factors in the younger group.

      Conclusion
      Pulmonary resection for the elderly patient requires caution, particularly in case of low diffusing capacity (DLCO < 70%) or airflow limitation (FEV1/FVC < 70%).