Combined Effect of HPV and Several Gene SNPs in Laryngeal Cancer.

Background and objectives: Laryngeal squamous cell carcinoma (LSCC) is one of the most common head and neck tumors. The molecular mechanism of LSCC remains unclear. The aim of this study was to evaluate the prevalence of Human papillomavirus (HPV) and single nucleotide polymorphisms (SNPs) of TP53, MDM2, MDM4, MTHFR, CASP8, and CCR5 genes in LSCC, and to assess their correlations with patient survival. Materials and Methods: 49 LSCC patients were enrolled in this study. PCR and qRT-PCR were used to detect, identify, and quantify HPV. SNPs were genotyped using PCR and PCR-RFLP. Results: By analyzing the interactions of the SNPs of the genes with clinical parameters, the majority of patients with lymph node status (N1,2) were identified as carriers of MDM2 T/G, CASP8 ins/del, CCR5 wt/wt SNP. Cluster analysis showed that patients with MDM2 T/T SNP survive longer than patients identified as CASP8 ins/ins, MTHFR C/C, and MDM4 A/A variant carriers; meanwhile, LSCC patients with MDM2 T/T polymorphic variant had the best survival. Multivariate analysis showed that HPV-positive patients without metastasis in regional lymph nodes (N0) and harboring CASP8 ins/del variant had the best survival. Meanwhile, HPV-negative patients with identified metastasis in lymph nodes (N1 and N2) and CASP8 ins/del variant had poor survival. Conclusions: This finding suggests patients survival prognosis and tumor behavior are different according HPV status, SNP variants, and clinical characteristics of the LSCC.

Prevalence of human papillomaviruses in patients with head and neck squamous cell carcinoma in Lithuania and Belarus.

Overall, head and neck sqamous cell carcinoma accounts for more than 550,000 cases annually worldwide. It is well known that human papillomavirus (HPV) is the main risk factor for cervical cancer development. As the incidence and the mortality of cervical cancer are closely related to the HPV prevalence, we hypothesized that there is the same association between HPV prevalence and head and neck squamous cell carcinoma. Therefore we performed the study aiming to compare the level of HPV infection and HPV type distribution between two groups of Lithuanian and Belarusian patients with head and neck sqamous cell carcinoma. One hundred ninety head and neck sqamous cell carcinoma patients were included in the study, 75 from Lithuania and 115 from Belarus. PCR was used for HPV detection and typing. The distribution of HPV infection among head and neck sqamous cell carcinoma patients was similar in the Lithuanian (20.0%) and Belarusian (18.3%) patient groups, however differences were found in the distribution of HPV types.