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Clinical Significance of ABCG2 Haplotype-tagging Single Nucleotide Polymorphisms in Patients With Unresectable Non-Small Cell Lung Cancer Treated With First-line Platinum-based Chemotherapy.


Am J Clin Oncol. 2013 May 17;


Authors: Kim SH, Kim MJ, Cho YJ, Jeong YY, Kim HC, Lee JD, Hwang YS, Kim IS, Lee S, Oh SY, Ling H, Lee GW


Abstract

OBJECTIVES:: The ATP-binding cassette (ABC) ABCG2, involved in multidrug resistance (MDR) in cancer cells, plays an integral role in drug resistance. Single nucleotide polymorphisms (SNPs) have been identified in many MDR-associated ABC genes that seem to influence drug sensitivity/resistance through various mechanisms. Therefore, we investigated whether ABCG2 haplotype-tagging SNPs (htSNPs) were associated with clinical outcomes in patients with unresectable non-small cell lung cancer (NSCLC) treated with front-line platinum-based chemotherapy. PATIENTS AND METHODS:: We genotyped 4 ABCG2 htSNPs for 129 unresectable NSCLC cases treated with first-line platinum-based chemotherapy. Clinical characteristics, treatment outcomes, and predictive value of the htSNPs in patient response, survival, and adverse events related to platinum-based chemotherapy were analyzed according to each ABCG2 htSNP using the χ test, Kaplan-Meier method, and Cox proportional hazard model. RESULTS:: The rs2725264 was significantly related to overall survival (OS) (P=0.018, log-rank test). The median survival duration (in months) for patients with the rs2725264 T/T, T/C, and C/C genotypes was 35.75 [95% confidence interval (CI), 24.25-47.25], 34.25 [hazard ratio (HR) 1.27 (0.68 to 2.35); 95% CI, 27.16-41.34], and 14.89 [HR 3.22 (1.26 to 8.24), 95% CI, 13.86-15.92], respectively. The rs2725264 was identified as an independent factor by Cox proportional hazard model analysis (P=0.028). In the taxane-based groups, OS was associated with rs2725264 (P=0.041), whereas in the gemcitabine-based groups, OS was associated with rs4148149 (P=0.014). CONCLUSIONS:: Our data suggest ABCG2 htSNPs rs2725264 (overall group and taxane-platinum combination group) and rs4148149 (gemcitabine-platinum combination group) were associated with OS in unresectable NSCLC patients treated with first-line platinum-based chemotherapy. Thus, the ABCG2 htSNP rs2725264 may be independently associated with OS in unresectable NSCLC patients treated with first-line platinum-based chemotherapy.

PMID: 23689644 [PubMed - as supplied by publisher]