The influence of human papillomavirus on nasopharyngeal carcinoma in Japan

Publication date: Available online 4 August 2016
Source:Auris Nasus Larynx
Author(s): Makoto Kano, Satoru Kondo, Naohiro Wakisaka, Makiko Moriyama-Kita, Yosuke Nakanishi, Kazuhira Endo, Shigeyuki Murono, Hiroyuki Nakamura, Tomokazu Yoshizaki
ObjectiveAlthough Japan is a non-endemic area with nasopharyngeal carcinoma (NPC), the proportion of WHO type I NPC in Japan are different from that in non-endemic areas such as North America and Europe. Recently, it is said that not only Epstein–Barr virus (EBV) but also human papillomavirus (HPV) has an influence on NPC in non-endemic areas. The aim of this study is to clarify the influence of HPV on NPC in Japan.MethodsParaffin-embedded tumor specimens were available for 59 patients with NPC diagnosed between 1996 and 2015. We detected the virus status by p16 immunohistochemistry, HPV PCR, and in situ hybridization for Epstein–Barr virus (EBV)-encoded RNA. Kaplan–Meier curves were used to compare the overall survival by viral status.ResultsAmong the 59 patients, 49 (83%) were EBV-positive/HPV-negative, 2 (3%) were EBV-positive/HPV-positive, and 8 (16%) were EBV-negative/HPV-negative. All HPV-positive NPCs were co-infected with EBV. There were no significant differences between the overall survival in the three groups (p=0.111).ConclusionIn Japan, HPV was detected in a few patients with NPC, and we suggest that HPV has no influence on NPC carcinogenesis in this population.



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