AIM OF THE STUDY To determine and compare the influence of the HPV DNA status and p16(INK4a) expression on the outcome of postoperative radiotherapy for squamous cell cancer of the oral cavity or oropharynx. MATERIAL AND METHODS 59 patients with high-risk squamous cell cancer of the oral cavity or oropharynx were enrolled. They underwent major surgery and postoperative radiotherapy. The HPV D...

An immunohistochemical analysis with monoclonal antibody p16(INK4a) was performed in formalin-fixed, paraffin-embedded samples of 60 cases. The aim was to investigate in biopsies the expression of p16(INK4a) of normal uterine cervical tissue, pre-cancerous and cancerous lesions, and their relation with human papilloma virus (HPV) and HIV status. Three parameters were evaluated: percentage of p1...

The aim of our study was to identify the frequency of expression of p16(INK4a) (CDKN2A) and HPV (human papilloma virus) in different grades of conjunctival intraepithelial neoplasia (CIN).Twelve specimens including CIN I (2), II (3), III (5), and CIN with beginning invasion (2), as well as 15 control specimens, were stained with antibodies against p16(INK4a) and MIB1. The presence of HPV was ex...

BACKGROUND The tumor suppressor protein p16(INK4a) has been extensively studied in many tumors with very different results, ranging from its loss to its clear overexpression, which may be associated with degree of tumor differentiation and prognosis. However, its expression remains unclear in human retinoblastoma (RB), a common malignant tumor of retina in childhood. The aim of this study was t...

BACKGROUND p16(INK4a) is a tumor suppressor gene frequently inactivated by aberrant promoter hypermethylation. In the present study, p16(INK4a) methylation was evaluated in non-small cell lung cancer (NSCLC) using a quantitative assay and the clinical significance of the methylation was explored. MATERIALS AND METHODS A total of 244 tumor samples from formalin-fixed paraffin-embedded archives...

to a variety of cellular proteins such as NF-␬B and I␬B (Hirai et al., 1994; Suzuki et al., 1996). Figure 1 shows the primary sequence of p16, along with that of other proteins in the p16 family: p15, p18, and p19, both human and murine. P16 is comprised mainly of four ankyrin repeats, a structural motif about Campus Chemical Instrument Center 33 amino acids long present in a variety of protein...

Bmi-1 prevents stem cell aging, at least partly, by blocking expression of the cyclin-dependent kinase inhibitor p16(Ink4a) . Therefore, dysregulation of the Bmi-1/p16(Ink4a) pathway is considered key to the loss of tissue homeostasis and development of associated degenerative diseases during aging. However, because Bmi-1 knockout (KO) mice die within 20 weeks after birth, it is difficult to de...

The cyclin-dependent kinase inhibitor p16(INK4A) is frequently inactivated in childhood T-cell acute lymphoblastic leukemia. To investigate possible consequences of this genetic alteration for tumor development, we conditionally expressed p16(INK4A) in the T-cell acute lymphoblastic leukemia line CCRF-CEM, which carries a homozygous deletion of this gene. In agreement with its reported function...

Primary lung tumors from B6C3F1 mice and mouse lung cell lines were examined to investigate the role of transcriptional silencing of the p16 (Ink4a) tumor suppressor gene by DNA hypermethylation during mouse lung carcinogenesis. Hypermethylation (>/=50% methylation at two or more of the CpG sites examined) of the p16 (Ink4a) promoter region was detected in DNA from 12 of 17 (70%) of the B6C3F1 ...

Alteration of VSMC (vascular smooth-muscle cell) physiology is associated with the development of atherosclerosis and restenosis. We hypothesize that aging up-regulates the expression of p16 INK4a in VSMCs, which may increase the susceptibility of blood vessels to vascular occlusive diseases. Aortic VSMCs were obtained from young and aged mice. Cells from aged mice grew more slowly than those f...