OBJECTIVE The prognostic significance of KRAS gene mutations, evaluated by using two methods in patients with colorectal cancer (CRC). MATERIAL AND METHODS Retrospective study involving 58 patients diagnosed with CRC and treated between 2003 and 2010 in the General and Esophageal Surgery Clinic of "Sf. Maria" Hospital, Bucharest. The macroscopic and microscopic examination of the resected spe...

The aim of this study was to identify K-ras mutations as marker for isolated tumor cells in liver, lymph node, and bone marrow specimens of colorectal cancer patients. To detect these, a PCR-RFLP assay was used with a sensitivity exceeding that of routine histopathology by at least 1 order of magnitude. In addition, the ratio of mutated versus wild-type alleles was determined by an internal sta...

The role of cellular oncogenes in the development of epithelial tumors of the human female reproductive tract has not previously been extensively studied. DNAs isolated from ten human uterine, 13 ovarian, and four cervical neoplasms and from three cell lines derived from endometrial adenocarcinoma were investigated by dot blot hybridization after polymerase chain reaction amplification of ras g...

KRAS mutational status has been shown to be a predictive biomarker of resistance to anti-EGFR monoclonal antibody (mAb) therapy in patients with metastatic colorectal cancer. We report the spectrum of KRAS mutation in 1506 patients with colorectal cancer and the identification and characterization of rare insertion mutations within the functional domain of KRAS. KRAS mutations are found in 44.5...

1 Department of Medical Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA; 2 Molecular Pathology Unit and Center for Cancer Research, Massachusetts General Hospital, Charlestown, MA; 3 Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, and Harvard Medical School, Boston, MA; 4 Department of Pathology, Brigham and Women’s Hospital, and Harvard ...

Mutations of the Ki-ras oncogene in endometrial carcinoma have been reported in Japan, but the prevalence and clinical significance of such mutations in the United States remains unclear. DNA extracted from paraffin sections of 112 carcinomas of the endometrium was amplified by the polymerase chain reaction with mismatched primers that generated a BstNI recognition site with the wild-type codon...

Mutagenesis of protooncogenes has been postulated to contribute to the initiation and progression of human cancer. Activating mutations in the H-ras gene are predominantly single-base substitutions and are most fre quently identified at codons 12, 13, and 61. We have analyzed the effects of DNA sequence context at specific codons that are hot spots for raj mutation with respect to abnormalities...

OBJECTIVE Colorectal cancer patients bearing wild-type KRAS benefit from anti-epidermal growth factor receptor (EGFR) antibody treatment. Since clinical studies showed the efficacy of anti-EGFR antibody treatment for metastatic colorectal cancer (mCRC), we analyzed KRAS mutations in mCRC to gain insight into the association between these mutations and clinicopathological characteristics. METH...

PURPOSE Bladder cancer is the fifth most common malignancy in men in Western society. We determined RAS codon 12 and 13 point mutations and evaluated mRNA expression levels in transitional cell carcinoma cases. MATERIALS AND METHODS Samples from 30 human bladder cancers and 30 normal tissues were analyzed by polymerase chain reaction/restriction fragment length polymorphism and direct sequenc...