Rapid and Specific Screening Assay for KRAS Oncogene Mutation by a Novel Gene Amplification Method

Area of Science:

• Molecular oncology
• Cancer diagnostics

Background:

• Epidermal growth factor receptor (EGFR) is a key therapeutic target in colorectal cancer.
• KRAS gene mutations at codons 12 and 13 significantly reduce the efficacy of anti-EGFR therapies.
• Accurate detection of KRAS mutations is essential for effective treatment decisions in colorectal cancer patients.

Purpose of the Study:

• To develop a rapid and efficient method for detecting KRAS gene mutations at codons 12 and 13.
• To enable precise patient stratification for anti-EGFR targeted therapies in colorectal cancer.

Main Methods:

• A novel loop-mediated isothermal amplification (LAMP) method was designed.
• Peptide nucleic acid (PNA) was utilized to selectively suppress wild-type allele amplification.
• The procedure was validated using six cancer cell lines with known KRAS mutations at codons 12 and 13.

Main Results:

• The developed mutation-oriented gene-amplification procedure successfully amplified KRAS gene fragments with codon 12 and 13 mutations.
• The entire amplification process was completed within 30 minutes.
• Boiled cancer cells could be directly used as template DNA, simplifying sample preparation.

Conclusions:

• The newly developed LAMP-based procedure offers a fast and reliable method for KRAS mutation detection.
• This technique is highly valuable for stratifying colorectal cancer patients eligible for anti-EGFR therapies.
• The simplified sample preparation using boiled cells enhances the clinical applicability of this diagnostic tool.