DISTRIBUTION OF HUMAN PAPILLOMA VIRUS GENOTYPES IN WOMEN WITH CERVICAL CANCER IN SLOVENIA AND GENOMIC VARIANTS OF HPV 16, HPV 18 AND HPV 33

Abstract

Background. To establish the distribution of human papillomavirus (HPV) genotypes in representative population of women with cervical cancer (CC) in Slovenia in order to contribute the lacking data on HPV in CC and to assess the potential local benefit of future prophylactic HPV vaccination. Furthermore, we wanted to determine genomic variants of the most common HPV genotypes. Methods. Polymerase chain reaction with GP5+/GP6+ primers was performed in all 278 CC samples for HPV DNA detection and genotyping. Negative samples were additionally tested using CPI/CPIIg primers and INNO-LiPA HPV genotyping assay. Genomic variants of HPV 16, HPV 18 and HPV 33 were determined by sequencing of LCR, E6 and E7 genetic regions. Results. A total of 262/278 CC samples (94.2 %) were HPV DNA positive. HPV genotypes in Slovenian women with CC, in decreasing order of frequency, were: 16, 18, 33, 45, 31, 51, 58, 59, 35, 52, 73 and 82. Detailed genomic analysis was carried out on 40/178 isolates of HPV 16, 20/34 isolates of HPV 18 and 11/13 isolates of HPV 33. A total of 26 genomic variants of HPV 16 were identified. Thirty-eight isolates (95 %) belonged to the European branch; one isolate (2.5 %) belonged to the Asian-American branch and one (2.5 %) to African branch.1, 2 A total of 18 genomic variants of HPV 18 were identified. Nineteen isolates (95 %) belonged to the European branch and one isolate (5 %) belonged to the African branch.2, 3 Seven genomic variants of HPV 33 were identified. Five isolates (45.5 %) belonged to prototypic variants and 6 (54.5 %) belonged to non-prototypic variants.4 Conclusions. Distribution of all HPV genotypes in Slovenian women with CC was in the present study established for the first time and represents baseline distribution before mandatory HPV vaccination. Prophylactic HPV vaccination with currently available vaccines could prevent up to 77.1 % of CC in Slovenia caused by HPV 16 or HPV 18. Almost all isolates of HPV 16 and HPV 18 belonged to European branches; prototypic and non-prototypic HPV 33 variants were almost equally distributed among Slovenian patients with CC.

Keywords

• humani virusi papiloma
• genotip
• rak materničnega vratu
• podtipska različica