DNA repair gene polymorphisms have been implicated as susceptibility factors in cancer development. It is possible that DNA repair polymorphisms may also influence the risk of gene mutation. The 399Gln polymorphism in the DNA repair gene XRCC1 has been indicated to have a contributive role in DNA adduct formation, sister chromatid exchange, and an increased risk of cancer development. Two hundr...

Because of the difficulty in obtaining biopsy specimens from pancreatic cancer patients, K-ras mutation analysis in pancreatic juice has been used for specific diagnosis. But recently, false positives have been obtained with this method. To improve the genetic diagnosis of pancreatic cancer, detection of p53 gene mutation in pancreatic juice was studied. Pancreatic juice was sampled endoscopica...

Multiplex Ligation-Dependent Probe Amplification (MLPA) was used to study the integrity of chromosomes for two WIL2-derived lymphoblastoid cell lines (TK6 and WTK1) in presence absence ionizing radiation. WTK1 cells contain a p53 mutation, whereas TK6 line has native tumor-suppressor gene. Each isolated pre- post-irradiation (2 3 Gy) analyzed by MLPA. Using probes that target specific regions o...

PURPOSE To investigate the spectrum of p53 gene mutations and the relationship between gene mutation and p53 protein levels in pterygium. METHODS Pterygial samples were harvested from 51 patients undergoing pterygium surgery. DNA samples for p53 mutation analyses were extracted from epithelial cells and subjected to DNA sequencing for examination of mutations in exons 4, 5, 6, 7, and 8 of the...

BACKGROUND Chronic HBV and HCV infections are the major risk factors for the development of HCC through a multistep pathway that involves viral and non-viral dependent pathophysiological steps. Hepatic expression of the nuclear proliferative marker ki-67 and the p53 oncoprotein were found to be associated with poor outcome. So, the present study was done to evaluate the changes in expression of...

BACKGROUND A study from Scotland reported that the p53 mutation frequency in breast tumors is associated with socio-economic deprivation. METHODS We analyzed the association of the tumor p53 mutational status with tumor characteristics, education, and self-reported annual household income (HI) among 173 breast cancer patients from the greater Baltimore area, United States. RESULTS p53 mutat...

In order to clarify the significance of mutation of the p53 tumor suppressor gene in the genesis and development of human hepatocellular carcinoma (HCC) in an aflatoxin I!, Ion-exposure area, the spec trum, i.e.. incidence, type, and site, oipS3 gene mutations was examined in 169 tissue samples resected mainly from Japanese patients using single-strand conformation polymorphism analysis and dir...

In human colorectal cancer (CRC), TP53 is one of the most important drives genes; it a key regulator apoptosis. The dysfunction gene critical event in development CRC this context, we aimed to evaluate expression Tp53 patients and establish correlation between overexpression p53 with clinical pathological features Colorectal Carcinoma (CRC). This study enrolled 32 carcinoma. was investigated by...

background there is evidence of a possible etiological role of human papillomaviruses (hpvs) in the development of colorectal cancer. loss of p53 tumor suppressor gene function has been found in many malignancies and it can occur in a variety of ways, including gene mutation and interaction with the e6 protein of oncogenic hpvs. the objective of this study was to determine the prevalence of hpv...

Mutations of the p53 tumor suppressor gene are a genetic hallmark of human astrocytic neoplasms, but their predictive role in glioma progression is still poorly understood. We analyzed 144 biopsies from 67 patients with recurrent astrocytoma by single-strand conformation polymorphism and direct DNA sequencing. We found that 46 of 67 patients (69%) had a p53 mutation in at least one biopsy. In 4...