KRAS mutations are mutually exclusive with other activating mutations on EGFR pathway. Detection of KRAS mutations associated with tumorigenesis, predicates the lack of other mutations on the same pathway and shows that the application of targeted therapy approaches which target other proteins in EGFR-MAPK pathway ineffective. In this study, frequency of KRAS mutations in colorectal cancer and relationship between KRAS mutation status and other clinical features were assessed. KRAS mutations were detected in 47,7% of the cases included in our study. We determined that 76% of the mutations were located in codon 12, 9% of the mutations were located in codon 13, 9% of the mutations were located in codon 61 and 6% of the mutations located in codon 117 or codon 146. Determination of mutation rates and association of mutations with clinical features for different populations are important for planning of the treatment strategies nationwide. In our study, we have demonstrated that KRAS mutation status and clinical features associated with KRAS mutation is in accordance with the literature. We have determined that there is statistically significant correlation between grade and KRAS mutation status.
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