نتایج جستجو برای: her2 amplification
تعداد نتایج: 71537 فیلتر نتایج به سال:
BACKGROUND Eighteen to twenty percent of breast cancer tumors show abnormal amplification of the Human Epidermal growth factor Receptor 2 (HER2) gene and increased expression of the associated protein. HER2 amplification is associated with rapid tumor proliferation and shorter disease-free and overall survival. Because women with HER2 amplification are more likely to benefit from treatment with...
To the Editor: We were interested to read the article by Gilcrease et al ‘‘Even low level Her2 expression may be associated with worse outcome in node positive breast cancer’’ that discusses the significance of low but nonnegative Her2 protein levels in the prognosis of breast cancer. As the authors note, the conventional immunohistochemical scoring system for Her2 includes cases with 1+ expres...
Although current breast cancer treatment guidelines limit the use of HER2-blocking agents to tumors with HER2 gene amplification, recent retrospective analyses suggest that a wider group of patients may benefit from this therapy. Using breast cancer cell lines, mouse xenograft models and matched human primary and metastatic tissues, we show that HER2 is selectively expressed in and regulates se...
Upper urinary tract urothelial carcinomas (UUTUC) are infrequent and show an occurrence of about 5-10% of all urothelial carcinomas. In this study, we investigated the HER2 status of 171 UUTUC patients with nephroureterectomy. The number of patients is the largest of any HER2 study. All 171 cases were analyzed for both HER2 overexpression using immunohistochemistry and HER2 gene amplification u...
The development of targeted therapies for KRAS, EGFR and HER2 may increase the range of response in patients with colorectal cancer. Mutation at codons 12 and 13 of the KRAS gene has been shown to be predictive of cetuximab response in colorectal cancer. However, due to the combined effects of multiple oncogenes involved in disease progression of patients with colorectal cancer, it seems to be ...
Purpose: We examined the frequency, tumor characteristics, and prognostic impact of HER2 protein expression and gene amplification in patients with curatively resected esophageal adenocarcinoma (EAC). Experimental Design:HER2 expression was analyzed by immunohistochemistry (IHC) in surgical EAC specimens (n 1⁄4 713). Gene amplification was examined by FISH in a large subset (n 1⁄4 344). Most tu...
AIM HER2 overexpression has been reported in a minority of urothelial carcinomas, but little is known about HER2 protein expression and gene alterations in plasmacytoid urothelial carcinoma, a rare and aggressive variant. The aim of this study was to clarify the HER2 status in plasmacytoid urothelial carcinomas. METHODS Six cases of plasmacytoid urothelial carcinoma were included, in which we...
Twenty-five years after the publication of seminal studies showing that HER2 gene amplification and protein overexpression are oncogenic in breast cancer, Bose and colleagues report on the identification of activating HER2 somatic mutations that, albeit rare, may determine the response of breast cancer cells to anti-HER2 agents. These results herald a new era for the potential use of existing H...
Background and Objective: Breast cancer is the fifth common cause of death in the world and is considered as the leading cause of cancer related death among females. HER2 is a surface antigen which is overexpressed in 30% of breast cancer cases. The aim of this study was cloning of HER2 receptor gene in pCDNA3.1Hygro+ expression vector, expression of this protein in LL2 eukaryotic cell line and...
PURPOSE Amplification and/or overexpression of HER2/neu have been documented in many types of epithelial tumor, and HER2/neu evaluation is now gaining importance, because this mechanisms of disease can be inhibited in vivo using humanized monoclonal antibodies. The main purpose of our investigation includes the evaluation of the prevalence of HER2/neu alterations in non-small cell lung cancer (...
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