title: In situ DNA hybridization analysis of human papillomavirus (HPV) sequences in benign oral mucosal lesions.
abstract: A series of 144 surgically treated benign oral mucosal lesions were analysed using an in situ DNA hybridization technique with 35S-labeled human papillomavirus (HPV) DNA probes to demonstrate the DNA of HPV types 6, 11, 13, and 16, in routinely processed, paraffin-embedded biopsy specimens. These lesions and an additional 62 benign oral mucosal biopsy specimens (total, 206 specimens) were also assessed by the indirect immunoperoxidase (IP-PAP) technique to detect the expression of HPV structural proteins (viral antigens). A total of 54/206 (26.2%) lesions were observed to express HPV antigens, being found in 45/92 (48.9%) of the squamous cell papillomas/condylomas, in 1/54 fibrous hyperplasias, in 1/8 true fibromas, and in 7/8 (87.5%) of the focal epithelial hyperplasia (FEH) lesions. Of the HPV DNA-positive lesions, 15/45 (33.3%) expressed HPV antigens, the expression not being related to any particular HPV type. HPV DNA sequences were found in 45/144 (31.3%) of the lesions. HPV DNA was present with the highest frequency in FEH (83.3%), followed by the papilloma/condyloma group (33.8%), papillary hyperplasia (28.6%), fibrous hyperplasia (24.4%), and true fibromas (14.3%). The most frequent HPV type was HPV 11, representing 37.8% of the DNA-positive lesions. HPV 13 DNA, previously regarded as specific to FEH, was disclosed as a single HPV type in seven cases, and as a double infection by HPV 11 and 13 in an additional three cases, including all five morphologically distinct entities. Noteworthy is the discovery of the high-risk HPV type 16 DNA in 17.8% of the DNA-positive lesions, four papilloma/condyloma lesions, three fibrous hyperplasias, and one FEH.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Oral Pathology and Radiology, University of Kuopio, Finland.
authors.forename: S M
authors.initials: SM
authors.lastname: Syrjänen
authors.forename: K J
authors.initials: KJ
authors.lastname: Syrjänen
authors.forename: R P
authors.initials: RP
authors.lastname: Happonen
authors.forename: M A
authors.initials: MA
authors.lastname: Lamberg
mesh_terms: D003218:Condylomata Acuminata / Q000382:microbiology; D004279:DNA, Viral / Q000032:analysis*; D006801:Humans; D006965:Hyperplasia / Q000382:microbiology; D009061:Mouth Mucosa / Q000382:microbiology* / Q000473:pathology; D009062:Mouth Neoplasms / Q000382:microbiology; D009693:Nucleic Acid Hybridization; D010212:Papilloma / Q000382:microbiology; D027383:Papillomaviridae / Q000235:genetics*
chemical_list: D004279:DNA, Viral