Gan to kagaku ryoho. Cancer & chemotherapy
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Gan To Kagaku Ryoho · Nov 2011
[High-throughput screening method of KRAS mutations at codons 12 and 13 in formalin-fixed paraffin-embedded tissue specimens of metastatic colorectal cancer].
Clinical studies overseas using the therapeutic anti-EGFR monoclonal antibodies, cetuximab or panitumumab against metastatic colorectal cancer(mCRC), have revealed KRAS mutations as a negative predictive marker of response. Accordingly, the Ministry of Health, Labour and Welfare in Japan approved medical reimbursement of the KRAS mutation test in April 2010. Anti-EGFR monoclonal antibody therapies are now used as first-line treatment for patients with mCRC. ⋯ Here we evaluated the basic performance of our system and confirmed its high specificity and reproducibility in detecting KRAS mutations at codons 12 and 13 in both plasmid DNAs carrying mutant KRAS genes and formalin-fixed paraffin-embedded tissues from mCRC patients. We demonstrated the KRAS mutation status in paraffin-embedded tissues of mCRC and confirmed that the results were comparable to those of the direct sequencing method. Our high-throughput method has an advantage in simultaneous analysis of multiple mutations in one well of 96-well PCR plates, and will advance the KRAS mutation test in clinical laboratories.