title: Prognostic role of p27(Kip1) expression in oral squamous cell carcinoma in Taiwan.
abstract: The cyclin-dependent kinase inhibitor p27(Kip1) can inhibit the G1 to S transition of the cell cycle and is a putative tumor suppressor. Decreased expression of p27(Kip1) protein has been correlated with poor prognosis in a variety of human tumors. We examined the expression of p27(Kip1) in oral squamous cell carcinoma (SCC), epithelial dysplasia (ED) and normal oral mucosa (NOM) using antibodies to p27(Kip1). Positive p27(Kip1) nuclear staining was detected in all the specimems from ED and NOM, whereas positive p27(Kip1) staining was observed in 16 of the 63 (25%) cases of oral SCC. The labeling index for p27(Kip1) protein was significantly reduced from NOM through ED to oral SCCs, indicating that changes of p27(Kip1) protein expression may be an early event in oral carcinogenesis in Taiwan. The Kaplan-Meier analysis showed patients with p27(Kip1)-positive tumors had significantly higher overall survival than those with p27(Kip1)-negative tumors in a total of 63 patients (P=0.015) and 47 patients with areca quid chewing habit (P=0.026). Multivariate analysis showed decreased p27(Kip1) protein expression was an independent significant predictor of poor overall survival in the patients with oral SCCs. These results indicate that p27(Kip1) protein expression may serve as a putative new adjuvant prognostic marker for routine assessment of oral SCC patients.
authors.affiliation: School of Dentistry, College of Medicine, National Taiwan University and Department of Dentistry, National Taiwan University Hospital, 1 Chang-Te Street, Taipei 100, Taiwan.
authors.forename: Mark Yen-Ping
authors.initials: MY
authors.lastname: Kuo
authors.forename: Hong-Yuan
authors.initials: HY
authors.lastname: Hsu
authors.forename: Sang-Heng
authors.initials: SH
authors.lastname: Kok
authors.forename: Ru-Cheng
authors.initials: RC
authors.lastname: Kuo
authors.forename: Hsian
authors.initials: H
authors.lastname: Yang
authors.forename: Liang-Jiunn
authors.initials: LJ
authors.lastname: Hahn
authors.forename: Chun-Pin
authors.initials: CP
authors.lastname: Chiang
mesh_terms: D000328:Adult; D000368:Aged; D001114:Areca / Q000009:adverse effects; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002294:Carcinoma, Squamous Cell / Q000209:etiology / Q000378:metabolism*; D018797:Cell Cycle Proteins / Q000378:metabolism*; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases / Q000037:antagonists & inhibitors; D004791:Enzyme Inhibitors / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000378:metabolism; D009062:Mouth Neoplasms / Q000209:etiology / Q000378:metabolism*; D011230:Precancerous Conditions / Q000378:metabolism; D011379:Prognosis; D012307:Risk Factors; D015996:Survival Rate; D025521:Tumor Suppressor Proteins / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D018797:Cell Cycle Proteins; D004791:Enzyme Inhibitors; D025521:Tumor Suppressor Proteins; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases