title: Expression pattern of p63 in oral epithelial lesions and submucous fibrosis associated with betel-quid chewing in Sri Lanka.
abstract: Betel-quid chewing, which is closely related to the high incidence of oral cancer, is prevalent in Sri Lanka. p63 has a remarkable structural similarity to p53, suggesting an aberrant expression in oral cancer. Using anti-p63 antibody and immunohistochemistry, the present study investigated the expression pattern of p63 in oral epithelial lesions, including different types of squamous cell carcinoma (SCC), different grades of epithelial dysplasia, and submucosal fibrosis associated with betel-quid chewing. Nuclear immunoreactivity for p63 was detected in all the cases, including normal oral epithelium and epithelial lesions. In normal oral epithelium, nuclear positivity for p63 was observed in some of the basal cell layers and focally in the parabasal layer. Nuclear positivity increased in the epithelial lesions. The percentage of positive nuclei in the epithelial lesions was significantly higher than in normal epithelium (P < 0.01) and was also significantly higher in oral submucosal fibrosis than in epithelial dysplasia (P < 0.05). The results indicate that the overexpression of p63 in oral precancerous lesions and SCC in betel-quid chewers in Sri Lanka may be a useful marker for oral precancerous lesions.
authors: Office of Deputy Provincial Director of Health Services, Polonnaruwa, Sri Lanka.
authors: Abusayeed M
authors: AM
authors: Haniffa
authors: Masato
authors: M
authors: Saitoh
authors: Yoshihiro
authors: Y
authors: Abiko
authors: Maiko
authors: M
authors: Takeshima
authors: Michiko
authors: M
authors: Nishimura
authors: Mami
authors: M
authors: Yamazaki
authors: Hiroki
authors: H
authors: Nagayasu
authors: Chihiro
authors: C
authors: Sugiura
authors: Malantha
authors: M
authors: Muthumala
authors: Tohru
authors: T
authors: Kaku
authors: Itsuo
authors: I
authors: Chiba
authors: Toshiyuki
authors: T
authors: Shibata
mesh_terms: D000328:Adult; D001114:Areca / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004848:Epithelium / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000378:metabolism; D008409:Mastication / Q000502:physiology*; D008875:Middle Aged; D009061:Mouth Mucosa / Q000473:pathology; D009062:Mouth Neoplasms / Q000378:metabolism*; D009914:Oral Submucous Fibrosis / Q000378:metabolism*; D013188:Sri Lanka; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D019394:Ki-67 Antigen; C115051:TP63 protein, human; D015534:Trans-Activators; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins