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X. Li



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    MINI 05 - EGFR Mutant Lung Cancer 1 (ID 103)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Treatment of Advanced Diseases - NSCLC
    • Presentations: 1
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      MINI05.02 - Impact of ABCG2 Polymorphisms on the Clinical Outcome of TKIs Therapy in Chinese Advanced Non-Small-Cell Lung Cancer Patients (ID 591)

      16:50 - 16:55  |  Author(s): X. Li

      • Abstract
      • Presentation
      • Slides

      Background:
      ATP binding cassette superfamily G member 2 (ABCG2) has been demonstrated to be associated with the effect of chemotherapy/targeted therapy in non-small-cell lung cancer (NSCLC) and the single nucleotide polymorphisms (SNPs) of ABCG2 gene are supposed to affect the expression of ABCG2 protein. The purpose of this study was to investigate the correlation between SNPs of ABCG2 and outcome of tyrosine kinase inhibitions (TKIs) therapy in Chinese advanced NSCLC patients.

      Methods:
      SNP genotyping(34 G/A, 421 C/A, 1143 C/T and -15622 C/T)of ABCG2 gene in 100 patients was performed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The clinical characteristics of 100 patients were collected. A total of 70 patients were treated with TKIs(gefitinib, erlotinib and icotinib). The association between ABCG2 polymorphisms and clinical characteristics was evaluated. Kaplan-Meier survival curves were plotted for overall survival (OS) and analyzed with the log-rank test. Cox proportional hazards model was applied to evaluate the association between OS and clinical or genomic characteristics and estimated the adjusted HR and its 95 %CI.

      Results:
      The three polymorphisms of the ABCG2 34 G/A, 421 C/A and 1143 C/T occurred more frequently compared with -15622 C/T in Chinese advanced NSCLC patients. The allele A of 421C>A happened frequently in EGFR mutation positive patients (33.3% vs 9.1%, P=0.038). There was no association between ABCG2 polymorphisms and other clinical characteristics (p> 0.05).The median OS of patients with 34G>A mutant type (GA+AA) was 31.0 (95%CI: 22.9-39.1) months , which was significantly longer than those with wild type (GG) , 18.0 (95%CI: 14.9-21.1) months (p=0.005). No significant difference of OS was found in 421 C/A and 1143 C/T polymorphisms (p> 0.05).

      Conclusion:
      Our findings demonstrate a strong association between the ABCG2 34G>A polymorphism and the overall survival of NSCLC patients treated with TKI. It may be a possible predictor of the clinical outcome of TKIs therapy in NSCLC patients.

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