title: p27Kip1expression as a prognostic marker for squamous cell carcinoma of the head and neck.
abstract: Regulation of the cell cycle is essential for carcinogenesis. The cell cycle is controlled by cyclin-dependent kinases (CDKs), which are upregulated by cyclins and downregulated by CDK inhibitors (CDKIs). Decreased p27Kip1expression has been associated with survival rate, tumor size, histological differentiation and the presence of lymph node metastasis in patients with various types of cancer. The aim of the current study is to provide a literature review on the association between p27Kip1expression and the clinical and pathological aspects of head and neck squamous cell carcinoma (HNSCC), and the expression of other CDKIs of the Cip/Kip family and cyclins. Throughout the literature, different methodologies were used to determine the immunohistochemical expression of p27Kip1; thus, results concerning p27Kip1expression in HNSCC vary widely. However, it has now been confirmed that p27Kip1is underexpressed in SCC cells. p27 may be a promising marker for determining the prognosis of HNSCC, despite the marked variability of the results obtained. An association between p27 expression and survival rate, time to recurrence and tumor stage has been observed. Based on the information currently available, it is premature to recommend the analysis of p27Kip1expression in guiding HNSCC treatment planning. However, although relatively unstudied, the correlation between p27Kip1expression and other tumor suppressor genes may turn out to be important in determining the prognosis of HNSCC. Further prospective studies utilizing standardized laboratory methodologies and statistics that facilitate meta-analyses are required to confirm this proposal.
authors.affiliation: Oral Medicine, Oral Surgery and Implantology Unit, Faculty of Medicine and Dentistry, Health Research Institute of Santiago (IDIS), Santiago de Compostela, A Coruña, Spain.
authors.forename: Miguel Reis
authors.initials: MR
authors.lastname: DE Almeida
authors.affiliation: Oral Medicine, Oral Surgery and Implantology Unit, Faculty of Medicine and Dentistry, Health Research Institute of Santiago (IDIS), Santiago de Compostela, A Coruña, Spain.
authors.forename: Mario
authors.initials: M
authors.lastname: Pérez-Sayáns
authors.affiliation: Department of Pathology and Forensic Sciences, University Hospital and School of Medicine of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Suárez-Peñaranda
authors.affiliation: Oral Medicine, Oral Surgery and Implantology Unit, Faculty of Medicine and Dentistry, Health Research Institute of Santiago (IDIS), Santiago de Compostela, A Coruña, Spain.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Somoza-Martín
authors.affiliation: Oral Medicine, Oral Surgery and Implantology Unit, Faculty of Medicine and Dentistry, Health Research Institute of Santiago (IDIS), Santiago de Compostela, A Coruña, Spain.
authors.forename: Abel
authors.initials: A
authors.lastname: García-García
keywords: head and neck squamous cell carcinoma; p27Kip1