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Increasing interest has been focused on the Epstein-Barr Virus (EBV)-associated cancers, including oropharyngeal cancer (OPC) and gastric cancer (GC). Different cytokines, growth factors and proteins take part in oncogenesis. The aim of our study was to generate a comparison of interleukin 10 (IL-10) and transforming growth factor β (TGF-β) levels, as well as latent membrane protein (LMP-1), Epstein-Barr virus capsid antigen (EBVCA), Epstein-Barr virus nuclear antigen (EBNA) and early antigen (EA) frequency in the serum of patients with GC and OPC. The study involved 50 patients with diagnosed GC and 50 patients with OPC. All studied patients were EBV positive. Fresh-frozen tumor tissue fragments were tested using nested PCR assay for EBV DNA detection. Sera from all individuals were investigated using ELISA tests to detect the presence of EBVCA IgG, EBNA IgG, EA IgG, as well as to determine the levels of IL-10 and TGF-β. The obtained results were subjected to statistical analysis. In patients with GC, the levels of TGF-β and IL-10 were significantly higher than in OPC patients. However, the frequency and level of EBVCA, EBNA and EA in patients with OPC and GC were not significantly different. In contrast, TGF-β and IL-10 levels were significantly higher in EBVaGC, as compared to OPC, suggesting their role in gastric carcinogenesis. The differences in frequency of LMP-1 detection in patients with OPC and GC may suggest different mechanism of oncogenesis. Further studies are required to clarify the role of Epstein-Barr virus in cancer development.

Comparison of TGF-β, IL-10 levels and LMP-1 in gastric and oropharyngeal carcinoma associated with EBV infection