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Posttreatment plasma VEGF levels may be associated with the overall survival of patients with advanced non-small cell lung cancer treated with bevacizumab plus chemotherapy

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Abstract

We sought to find blood-based biomarkers that can be used to predict efficacy in advanced non-small cell lung cancer patients treated with bevacizumab plus chemotherapy. Blood was collected before treatment and after 6 weeks of therapy from patients who were participating in a phase 4 trial. Plasma vascular endothelial growth factor (VEGF) levels were evaluated by ELISA. A total of eight single nucleotide polymorphisms in four candidate genes were analyzed by PCR and sequencing. A total of 45 patients enrolled in a clinical trial at Guangdong General Hospital between August 2007 and March 2008 were used as subjects. The median survival times of OS was 25.6 and 13.4 months in the low and high groups, respectively, when the median posttreatment plasma VEGF level (46.63 pg/ml) was used as the cut-off point (P = 0.0284). Patients carrying the AA genotype at the −6C > A polymorphism in laminin 5 (LN5) were more likely to exhibit reduced hemoglobin compared with patients carrying the CA/CC genotype (OR = 8.364, χ2 = 5.34, P = 0.021). Similar associations were found at the −89A > G and −260C > A polymorphisms in LN5. Patients with the CC genotype at the −6C > A polymorphism in LN5 had an increased risk of neutropenia than those with the CA/AA genotype (OR = 4.444, χ2 = 5.116, P = 0.030). Our results show improved survival in patients with lower posttreatment plasma VEGF levels treated with bevacizumab plus chemotherapy; thus, the posttreatment plasma VEGF level may be a promising biomarker to predict clinical benefit early in the course of therapy. Polymorphisms in LN5 were associated with a reduced level of hemoglobin and neutropenia.

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Acknowledgments

We wish to thank Drs. Hong-Yan Tang, Hong-Sui Wu, and Shi-Liang Chen for their assistance with sample collection. This work was supported by grants from the National Natural Science Foundation of China (No. 30772531), Guangdong Provincial Medical Science and Technology Research Foundation (B2006001), and China Postdoctoral Science Foundation (20060400212).

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Correspondence to Yi-Long Wu.

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An, SJ., Huang, YS., Chen, ZH. et al. Posttreatment plasma VEGF levels may be associated with the overall survival of patients with advanced non-small cell lung cancer treated with bevacizumab plus chemotherapy. Med Oncol 29, 627–632 (2012). https://doi.org/10.1007/s12032-011-9924-x

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