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L. Xu



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    JCES01 - Joint IASLC - Chinese Society for Clinical Oncology - Chinese Alliance Against Lung Cancer Session (ID 413)

    • Event: WCLC 2016
    • Type: Joint Chinese / English Session
    • Track:
    • Presentations: 1
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      JCES01.23 - EGFR Mutation Status Analysis in Cerebrospinal Fluid and Plasma of Advanced Lung Adenocarcinoma with Brain Metastases (ID 7065)

      L. Xu

      • Abstract
      • Slides

      Background:
      We aimed to investigate the feasibility of droplet digital PCR (ddPCR) for the detection of epidermal growth factor receptor (EGFR) mutations in circulating free DNA (cfDNA) from cerebrospinal fluid (CSF) and plasma of advanced Lung Adenocarcinoma (ADC) with brain metastases (BM).

      Methods:
      Fourteen advanced ADC patients with BM carrying activating EGFR mutations in tumour tissues were enrolled in this study, and their matched CSF and plasma samples were collected. EGFR mutations were detected by the Amplification Refractory Mutation System (ARMS) in tumour tissues. EGFR mutations, including 19del, L858R, and T790M were examined in cfDNA isolated from 2milliliter CSF or plasma by ddPCR assay. The clinical response was assessed according to Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 guidelines. Overall survival (OS) and progression free survival (PFS) after the diagnosis of BM were also evaluated.

      Results:
      Out of 14 patients, eleven were females and three males aged from 34 to 74 years old (median age of 55 years old). In all of cases, CSF cytology were negative. In ddPCR assays, EGFR mutations were detected in CSF of three patients (21.4%; one of 19del and two of L858R), and in plasma of six patients (42.9%; one of 19del, one of L858R, one of T790M, two of L858R&T790M, and one of 19del&T790M). All EGFR T790M mutations were found during or after EGFR-TKIs treatments. The three patients with activating EGFR mutations in CSF achieved partial response (PR) of BM after treated with combination of WBRT and EGFR-TKIs. The median OS and PFS after the diagnosis of BM were 18.0 months and 9.0 months, respectively.

      Patient Tissue EGFR CSF EGFR Plasma EGFR Systematic Treatment BM Treatment
      1 19del WT T790M Erotinib+Chemotherapy WBRT+Gamma knife
      2 19del WT 19del Erotinib+Chemotherapy WBRT
      3 L858R L858R L858R Gefitinib+Chemotherapy WBRT
      4 L858R WT WT Gefitinib+Chemotherapy WBRT
      5 19del WT WT Gefitinib+Chemotherapy WBRT
      6 L858R WT L858R/T790M Erotinib+Chemotherapy WBRT
      7 L858R WT WT Gefitinib WBRT
      8 19del 19Del 19Del/T790M Gefitinib WBRT
      9 L858R WT WT Erotinib+Chemotherapy NONE
      10 19del WT WT Erotinib+Chemotherapy WBRT
      11 19del WT WT Icotinib+Chemotherapy WBRT
      12 L858R WT L858R/T790M Chemotherapy WBRT
      13 L858R L858R WT Icotinib WBRT
      14 19del WT WT Gefitinib+Chemotherapy WBRT


      Conclusion:
      It was feasible to test EGFR mutation in CSF. CSF may serve as liquid biopsy of advanced ADC with BM by enabling measurement of cfDNA within CSF to characterize EGFR mutations.

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    P2.03b - Poster Session with Presenters Present (ID 465)

    • Event: WCLC 2016
    • Type: Poster Presenters Present
    • Track: Advanced NSCLC
    • Presentations: 1
    • Now Available
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      P2.03b-010 - EGFR Mutation Status Analysis in Cerebrospinal Fluid and Plasma of Advanced Lung Adenocarcinoma with Brain Metastases (Now Available) (ID 4880)

      L. Xu

      • Abstract
      • Slides

      Background:
      We aimed to investigate the feasibility of droplet digital PCR (ddPCR) for the detection of epidermal growth factor receptor (EGFR) mutations in circulating free DNA (cfDNA) from cerebrospinal fluid (CSF) and plasma of advanced Lung Adenocarcinoma (ADC) with brain metastases (BM).

      Methods:
      Fourteen advanced ADC patients with BM carrying activating EGFR mutations in tumour tissues were enrolled in this study, and their matched CSF and plasma samples were collected. EGFR mutations were detected by the Amplification Refractory Mutation System (ARMS) in tumour tissues. EGFR mutations, including 19del, L858R, and T790M were examined in cfDNA isolated from 2 milliliter CSF or plasma by ddPCR assay. The clinical response was assessed according to Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 guidelines. Overall survival (OS) and progression free survival (PFS) after the diagnosis of BM were also evaluated.

      Results:
      Out of 14 patients, eleven were females and three males aged from 34 to 74 years old (median age of 55 years old). In all of cases, CSF cytology were negative. In ddPCR assays, EGFR mutations were detected in CSF of three patients (21.4%; one of 19del and two of L858R), and in plasma of six patients (42.9%; one of 19del, one of L858R, one of T790M, two of L858R&T790M, and one of 19del&T790M). All EGFR T790M mutations were found during or after EGFR-TKIs treatments. The three patients with activating EGFR mutations in CSF achieved partial response (PR) of BM after treated with combination of WBRT and EGFR-TKIs. The median OS and PFS after the diagnosis of BM were 18.0 months and 9.0 months, respectively.

      Patient Tissue EGFR CSF EGFR Plasma EGFR Systematic Treatment BM Treatment
      1 19del WT T790M Erotinib+Chemotherapy WBRT+Gamma knife
      2 19del WT 19del Erotinib+Chemotherapy WBRT
      3 L858R L858R L858R Gefitinib+Chemotherapy WBRT
      4 L858R WT WT Gefitinib+Chemotherapy WBRT
      5 19del WT WT Gefitinib+Chemotherapy WBRT
      6 L858R WT L858R/T790M Erotinib+Chemotherapy WBRT
      7 L858R WT WT Gefitinib WBRT
      8 19del 19Del 19Del/T790M Gefitinib WBRT
      9 L858R WT WT Erotinib+Chemotherapy NONE
      10 19del WT WT Erotinib+Chemotherapy WBRT
      11 19del WT WT Icotinib+Chemotherapy WBRT
      12 L858R WT L858R/T790M Chemotherapy WBRT
      13 L858R L858R WT Icotinib WBRT
      14 19del WT WT Gefitinib+Chemotherapy WBRT


      Conclusion:
      It was feasible to test EGFR mutation in CSF. CSF may serve as liquid biopsy of advanced ADC with BM by enabling measurement of cfDNA within CSF to characterize EGFR mutations.

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    P3.02c - Poster Session with Presenters Present (ID 472)

    • Event: WCLC 2016
    • Type: Poster Presenters Present
    • Track: Advanced NSCLC
    • Presentations: 1
    • Now Available
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      P3.02c-016 - Efficacy of Bevacizumab Combined with Chemotherapy in Lung Adenocarcinoma-Induced Malignant Pleural Effusion (Now Available) (ID 5276)

      L. Xu

      • Abstract
      • Slides

      Background:
      Malignant pleural effusion(MPE) is a common complication in advanced lung cancer, with multiple symptoms and poor prognosis. Vascular endothelial growth factor (VEGF) was considered important in the formation of MPE. We aimed to investigate the efficacy of bevacizumab plus chemotherapy in the treatment of MPE due to lung adenocarcinoma.

      Methods:
      Data of 18 lung adenocarcinoma patients with MPE were analyzed retrospectively. All the patients were treated with bevacizumab plus chemotherapy with 3 weeks in one cycle, up to 6 cycles. Those who exhibited response or stable disease received maintenance therapy of bevacizumab till disease progression. The primary outcomes were control rate of MPE, progression free survival(PFS), pleural progression-free survival (PPFS) and changes in the lung volumn and thoracic cage. Evaluation by CT scan was done every 6 weeks.

      Results:

      Observation Items Outcomes
      Response in Measurable Lesions CR PR SD PD RR
      n(%) 0(0) 8(44.4) 9(50.0) 1(5.6) 8(44.4)
      Response in MPE CR PR NC PD RR
      n(%) 7(38.9) 7(38.9) 3(16.7) 1(5.6) 14(77.8)
      Control Rate of MPE 6weeks 12weeks 24weeks 48weeks 96weeks
      n(%) 17(94.4) 16(88.9) 15(88.2) 10(66.7) 6(40.0)
      MPE Conditions at the Time of Measurable Lesions PD CR PR NC PD
      n(%) 5(35.7) 6(42.9) 0(0) 3(21.4)
      Changes in the Lung Volume and Thoracic Cage Lung Reexpansion ≥ 70% Thoracic Cage Diminishment
      n(%) 16(88.9) 1(5.6)
      Survival PFS PPFS OS
      Median(day) 254 734 773
      All the 18 cases were evaluable for response. Median age was 59 years(29 years-74 years). There were 14 chemotherapy-naïve patients and 4 relapsing patients. Median numbers of cycles were 7(1-42) for bevacizumab and 5(2-6) for chemotherapy. Median duration of follow-up was 596 days(76-1752 days). Control rate of MPE at 6 weeks, 12 weeks, 24 weeks, 48 weeks, 96weeks were 94.4%, 88.9%, 88.2%, 66.7%, 40.0% respectively. The response rate of MPE to combine treatment reached 77.8%. Median PPFS was significantly longer than PFS(734days vs 254 days, P=0.039). The overall survival was 773 days. 16(88.9%) patients experienced lung reexpansion after treatment. Only one(5.6%) patient suffered from thoracic cage diminishment in treatment and follow-up period. Side effects of bevacizumab-based regimens included myelosuppression, digestive symptoms, bleeding, hypertension, proteinuria, etc. Most of them were grade 1-2.

      Conclusion:
      Bevacizumab combined with chemotherapy demonstrated efficacious, persistent and safety in controlling MPE caused by lung adenocarcinoma. It was suggested that lung adenocarcinoma patients complicated with MPE are more likely to get benefit from bevacizumab-based chemotherapy.

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