Simple and sensitive method for detecting point mutations of epidermal growth factor receptor using cationic...

Area of Science:

• Biotechnology
• Molecular Biology
• Oncology

Background:

• The L858R mutation in epidermal growth factor receptor (EGFR) is crucial for non-small cell lung cancer (NSCLC) treatment response.
• EGFR tyrosine kinase inhibitors (TKIs) are effective against NSCLC with specific EGFR mutations.
• Accurate and sensitive detection of these mutations is vital for personalized therapy.

Purpose of the Study:

• To develop a simple, sensitive, and cost-effective method for identifying EGFR mutations, specifically L858R.
• To validate the method's performance in cell lines, tumor tissues, and clinical samples.
• To compare the new method with existing techniques like DNA sequencing and real-time PCR.

Main Methods:

• Utilized cationic conjugated polymer-based fluorescence resonance energy transfer (CCP-based FRET) technology.
• Developed a novel detection system for EGFR L858R mutation in DNA samples.
• Applied the method to cell lines, 48 tumor tissue DNA samples, and 35 clinical samples for T790M mutation detection.

Main Results:

• The CCP-based FRET method achieved high sensitivity (95.24%) and specificity (96.30%) in detecting L858R mutations in tumor tissues.
• The system can detect mutations at concentrations as low as 4-8% of total DNA.
• The method demonstrated comparable or superior performance to DNA sequencing and real-time PCR, with simplified procedures and amplified fluorescence signals.

Conclusions:

• CCP-based FRET technology offers a highly sensitive, cost-effective, and simple approach for EGFR mutation detection in NSCLC.
• This technology can confirm results from other methods and aids in identifying patients suitable for anti-EGFR therapy.
• The method holds significant potential for clinical molecular diagnosis and guiding personalized lung cancer treatment.