Association between VEGF–460T/C gene polymorphism and clinical outcomes of nasopharyngeal carcinoma treated with intensity-modulated radiation therapy

摘要

Vascular endothelial growth factor (VEGF) is a potent angiogenic factor that plays a critical role in the development, metastasis, and recurrence of tumors. This study aims to determine the correlation of single-nucleotide polymorphisms in the VEGF gene with the prognosis of nasopharyngeal carcinoma (NPC). The VEGF –460T/C gene polymorphisms in the genomic DNA of the blood samples of 338 patients with NPC were investigated through polymerase chain reaction and direct DNA sequencing. Results showed a significant association between the –460C-allele carriers and the aggressive forms of NPC as defined by stages N2–3 (odds ratio =1.820, 95% confidence interval [CI]: 1.118–2.962, P=0.015). Furthermore, the VEGF –460T/C polymorphism was significantly associated with 3-year overall survival (OS), distant metastasis-free survival (DMFS), and progression-free survival (PFS) (T/C + C/C vs T/T: 3-year OS 78.8% vs 95.1%, P=0.003; 3-year DMFS 80.2% vs 90.6%, P=0.036; 3-year PFS 73.9% vs 86.7%, P=0.042) but was not associated with the local recurrence-free survival (LRFS) of the patients. The multivariate analysis indicated that the VEGF –460C-allele carrier was an independent significant prognostic factor for OS (hazard ratio [HR] 4.096, 95% CI: 1.333–12.591, P=0.014). N classification was an independent significant prognostic factor for DMFS in patients with locoregionally advanced NPC (HR 3.674, 95% CI: 1.144–11.792, P=0.029). However, neoadjuvant chemotherapy (NACT) followed by concurrent chemoradiotherapy (CCRT) was not superior to CCRT alone in terms of the 3-year OS, LRFS, DMFS, and PFS of patients with VEGF –460T/C polymorphism. In conclusion, the VEGF –460T/C gene polymorphism may negatively affect the clinical outcomes of patients with NPC and may be considered a potential prognostic factor for this disease.