Abstract
Optimal conditions for the screening of cervical scrapes for human papillomavirus (HPV) were investigated by using filter in situ hybridization. Since integrated and episomal HPV can be found, cell lines containing viral DNA in an integrated form (HPV in CaSki) or in an episomal state (BK virus-induced hamster tumor cells) were used for optimization experiments. An increase in sensitivity was achieved by alkaline denaturation and neutralization before the specimens were spotted onto the membrane. This increase was 5-fold for the episomal virus and 16-fold for the integrated virus in the model system, as compared with other methods. To evaluate this method on clinical material, 1,963 cervical scrapes were screened for the presence of HPV 6/11 and HPV 16. Nineteen scrapes were positive for HPV 6/11 or HPV 16; and in 1,810 scrapes, no HPV 6/11 or HPV 16 could be detected by the modified filter in situ hybridization technique. Scrapes from which the interpretation of the modified filter in situ hybridization results were equivocal (n = 71, 3.6%) or in which positivity was detected for both HPV 6/11 and HPV 16 (n = 63, 3.2%) were further analyzed by the DNA dot spot technique. Eight scrapes with an equivocal result and only one scrape showing a double positivity by the modified filter in situ hybridization technique could be confirmed in the dot spot assay. In the total group 12 scrapes were positive for HPV 6/11 DNA, 15 were positive for HPV 16 DNA, and 1 was positive for both HPV 6/11 and HPV 16 DNA. Southern blot analysis on modified filter in situ hybridization-positive and -negative scrapes revealed a 100% correlation.
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