A novel loop‑mediated isothermal amplification method for efficient and robust detection of EGFR mutations

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Somatic mutations in the epidermal growth factor receptor (EGFR) are crucial targets for advanced or metastatic non-small cell lung cancer therapy.
• Accurate identification of EGFR mutations is essential for guiding treatment decisions and improving patient outcomes.
• Existing methods for mutation detection, such as quantitative PCR, require specialized equipment and expertise.

Purpose of the Study:

• To evaluate the efficiency of a loop-mediated isothermal amplification (LAMP) assay for identifying EGFR mutations in pulmonary adenocarcinoma.
• To compare the performance of the LAMP assay against the established Therascreen quantitative PCR assay.
• To assess the potential of LAMP as a valuable alternative for oncogene mutation detection in clinical settings.

Main Methods:

• Surgically resected tumor samples from patients with pulmonary adenocarcinoma were analyzed.
• EGFR mutation status was determined using both loop-mediated isothermal amplification (LAMP) and Therascreen quantitative PCR (qPCR).
• Discrepant results were further investigated using direct sequencing for confirmation.

Main Results:

• EGFR mutations were detected in 32/59 samples by LAMP and 33/59 samples by Therascreen qPCR.
• A discrepancy in one case (Case X) was resolved by direct sequencing, confirming the LAMP assay's result.
• A novel deletion mutation in exon 19 of EGFR was identified using the LAMP method.

Conclusions:

• The loop-mediated isothermal amplification (LAMP) assay demonstrates comparable efficiency to Therascreen qPCR for identifying EGFR mutations.
• LAMP offers a promising alternative for the detection of oncogene mutations, potentially simplifying diagnostic workflows.
• The study highlights the utility of LAMP in accurately identifying EGFR mutations, including novel variants, in lung cancer.