| http://purl.uniprot.org/citations/21055216 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/21055216 | http://www.w3.org/2000/01/rdf-schema#comment | "ObjectiveTo establish a simple, rapid and economical method in detecting mutations of oncogene K-ras and to investigate its mutations in colorectal cancer tissues and its relationship with clinicopathologic characteristics of colorectal carcinoma.MethodsForty colorectal cancer tissues were tested for K-ras mutations at codon 12 and codon 13 using polymerase chain reaction (PCR) followed by direct sequencing and polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) followed by sequence analysis. The other 113 colorectal cancer tissues were tested for K-ras mutations at codon 12 and codon 13 using PCR-RFLP followed by sequence analysis only. The mutation results were analyzed with the corresponding clinical pathological data.ResultsAmong 40 colorectal cancer cases, none of K-ras mutations at codon 12 and codon 13 was detected by PCR followed by direct sequencing. However, K-ras mutations were found in 11 cases (11/40, 27.5%) by PCR-RFLP followed by sequence analysis, including 8 cases at codon 12 and 3 cases at codon 13 respectively. Among 153 colorectal cancer cases, point mutations were detected by PCR-RFLP followed by sequence analysis in 58 cases (37.9%). Point mutations at codon 12 were found in 46 cases and 12 cases at codon 13. Mutations with the highest frequency were G→A transitions (25/58, 43.1%) at codon 12. No significant correlation was observed between mutations of K-ras and gender, invasive depth, tumor differentiation, number of invaded lymph nodes, distant metastasis and clinical stage (P > 0.05). Mutation of oncogene K-ras at codon 12 and codon 13 was closely related with age and tumor location (P < 0.05). The incidence of K-ras mutation was significantly higher in younger patients and in patients with ascending colon cancer.ConclusionsPCR-RFLP followed by sequence analysis is a rapid, simple, sensitive and low-cost method. It is a suitable technology for detecting hot-spot mutations in the K-ras oncogene. Mutation of oncogene K-ras at codon 12 and codon 13 is a common molecular event in colorectal carcinogenesis, which might be related with age and tumor location."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/author | "Shen H."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/author | "Yuan Y."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/author | "Zheng S."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/author | "Hu H.G."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/author | "Ye X.X."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/date | "2010"xsd:gYear |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/name | "Zhonghua Wai Ke Za Zhi"xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/pages | "1247-1251"xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/title | "[K-ras gene mutation in colorectal cancer and its clinicopathologic significance]."xsd:string |
| http://purl.uniprot.org/citations/21055216 | http://purl.uniprot.org/core/volume | "48"xsd:string |
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