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Erschienen in:
01.09.2015 | Brief Research Article
RAS status in Korean patients with stage III and IV colorectal cancer
Erschienen in: Clinical and Translational Oncology | Ausgabe 9/2015
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Background
KRAS mutations are common and clearly contribute to malignant progression. The frequency of NRAS mutations and their relationship to clinical, pathologic, and molecular features remains unclear.
Methods
We evaluated 130 colorectal tumors for mutations in KRAS and NRAS gene. We tested for mutations in codons 61 and 146 of KRAS and codons 12, 13, 59, 61 and 146 of NRAS. Mutation status was determined by targeted dideoxy sequencing.
Results
Among the analyzed primary tumors, 36.2 % had KRAS mutation. Of the 83 KRAS codon 12 and 13 wild-type patients, 7.2 % had KRAS codon 61, 146 or NRAS. 40.7 % harbored any RAS mutation.
Conclusion
The frequency of other RAS (NRAS and KRAS exon 3, 4) activating mutations in colorectal cancers is relatively low in Korean colorectal cancer patients.