Loop-Mediated Isothermal Amplification as Point-of-Care Testing for EGFR-Mutated Lung Adenocarcinoma

Area of Science:

• Oncology
• Molecular Diagnostics
• Genetics

Background:

• Liquid biopsy is a diagnostic tool for epidermal growth factor receptor (EGFR) mutations in advanced or metastatic non-small cell lung cancer (NSCLC).
• Loop-mediated isothermal amplification (LAMP) is a rapid DNA amplification technique often used for pathogen detection.

Purpose of the Study:

• To evaluate the efficacy of an EGFR-LAMP assay using plasma samples from patients with resected NSCLC tumors.
• To compare the performance of LAMP with next-generation sequencing (NGS) for EGFR mutation detection in NSCLC.

Main Methods:

• Investigated EGFR status in 51 specimens from patients with EGFR-mutated NSCLC tumors or metastatic lymph nodes.
• Utilized both LAMP and NGS assays on preoperative plasma samples with sufficient DNA.
• Included cases with EGFR mutations confirmed by the Therascreen EGFR PCR Kit.

Main Results:

• The LAMP assay detected one EGFR mutation also identified by NGS.
• One plasma sample showed wild-type EGFR by LAMP but mutant EGFR by NGS.
• Detection rates were low for both assays (LAMP: 1.9%, NGS: 3.9%), indicating similar performance for EGFR mutations in NSCLC.
• The LAMP assay was time-saving, cost-effective, and straightforward compared to NGS.

Conclusions:

• The EGFR-LAMP assay demonstrated similar performance to NGS in detecting EGFR mutations in NSCLC, with very low detection rates.
• The assay may be more suitable for advanced-stage NSCLC rather than early-stage disease.
• Further research is needed to enhance the sensitivity of the LAMP assay for broader clinical application.