نتایج جستجو برای: rassf1a
تعداد نتایج: 855 فیلتر نتایج به سال:
PURPOSE To evaluate prognostic and predictive molecular biomarkers in early-stage non-small cell lung carcinoma (NSCLC) receiving neoadjuvant chemotherapy. EXPERIMENTAL DESIGN The IFCT-0002 trial compared two neoadjuvant regimens in 528 stages I to II NSCLC patients. DNA extraction of snap-frozen surgical samples taken from 208 patients receiving gemcitabine-cisplatin or paclitaxel-carboplati...
چکیده مقدمه: سرطان پستان یک تهدید عمده برای سلامتی زنان سراسر جهان می‌باشد و پیشرفت‌هایی در توانایی ما برای جلوگیری، تشخیص و درمان این بیماری نیاز به درک بیشتری از پایه و اساس مولکولی ایجاد سرطان پستان دارد. بررسی متیلاسیون ژن‌های چرخه سلولی می‌تواند به‌عنوان یک شیوه برای شناسایی کردن ژن‌های مهم در تومورزایی استفاده شود و ارزش تشخیصی/ پیش‌آگهی‌دهنده داشته باشد. هدف این مطالعه بررسی وضعیت مت...
Epigenetic aberration is known to be important in human carcinogenesis. Promoter methylation status of RAS effector related genes, RASSF1A, RASSF2A, hDAB2IP (m2a and m2b regions) and BLU, was evaluated in 76 endometrial carcinomas and their non-neoplastic endometrial tissue by methylation specific PCR. Hypermethylation of at least one of the 5 genes was detected in 73.7% of carcinomas. There we...
Introduction: Currently the majority of lung cancer patients are diagnosed as advanced diseases for no sensitive and specific biomarkers exist, noninvasive biomarkers with high sensitivity and specificity are urgently needed in lung cancer diagnosis. Bronchoscopy is a standard procedure of the diagnostic work-up of patients with suspected lung cancer despite of the limited diagnostic accuracy. ...
The down-regulation of the tumor-suppressor gene RASSF1A has been shown to increase cell proliferation in several tumors. RASSF1A expression is regulated through epigenetic events involving the polycomb repressive complex 2 (PRC2); however, the molecular mechanisms modulating the recruitment of this epigenetic modifier to the RASSF1 locus remain largely unknown. Here, we identify and characteri...
Background. Assessment of DNA methylation of specific genes is one approach to the diagnosis of cancer worldwide. Early stage detection is necessary to reduce the mortality rate of cancers, including those occurring in the stomach. For this purpose, tumor cells in circulating blood offer promising candidates for non-invasive diagnosis. Transcriptional inactivation of tumor suppressor genes, lik...
RASSF1A (Ras association domain family 1 isoform A) is a recently discovered tumor suppressor whose inactivation is implicated in the development of many human cancers. Although it can be inactivated by gene deletion or point mutations, the most common contributor to loss or reduction of RASSF1A function is transcriptional silencing of the gene by inappropriate promoter methylation. This epigen...
Ras association domain family 1A (RASSF1A) is one of the most epigenetically silenced elements in human cancers. Localized on chromosome 3, it has been demonstrated to be a bone fide tumor suppressor influencing cell cycle events, microtubule stability, apoptosis, and autophagy. Although it is epigenetically silenced by promoter-specific methylation in cancers, several somatic nucleotide change...
background: ras-associated domain family 1 (rassf1a) and hypermethylated in cancer (hic1) genes are methylated more frequently in breast cancer. genetic factors that alter the dna methylation levels in normal and tumor tissues could therefore influence the susceptibility to this tumor phenotype. objective: we determined the frequency of aberrant methylation of hic1 and rassf1a gene promoters an...
Aberrant DNA methylation is critical for development and progression of breast cancer. We investigated the association of CpG island methylation in candidate genes and clinicopathological features in 65 African-American (AA) and European-American (EA) breast cancer patients. Quantitative methylation analysis was carried out on bisulfite modified genomic DNA and sequencing (pyrosequencing) for p...
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