[Detection of epidermal growth factor receptor mutations in non-small cell lung cancer tumor specimens from various
Siyuan Chen1, Zhihong Chen, Ailin Guo
1Guangdong Lung Cancer Institute, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
Background And Objective:
Epidermal growth factor receptor (EGFR) is the most important therapeutic target in non-small cell lung cancer (NSCLC). EGFR mutations may predict responsiveness to tyrosine kinase inhibitors (TKIs). These mutations are commonly identified using direct sequencing, which is considered the gold standard. But direct sequencing is time-consuming and hyposensitive. In addition, this method requires a lot of tumor specimens. Denaturing highperformance liquid chromatography (DHPLC) is a rapid automated sensitive and specific method in mutant gene detection. The aim of this study is to evaluate DHPLC as a rapid detection method for EGFR mutations in NSCLC tumor specimens.
Methods:
DHPLC was used to evaluate the accuracy and sensitivity of detection the serial dilutions of mutant and wild type EGFR plasma DNA. Frozen tumor specimens of 83 NSCLC patients from various ways had been included, after DNA extraction and polymerase chain reaction (PCR) on EGFR exon 19 and 21, the results from the direct sequencing and DHPLC were compared.
Results:
Mutant plasma DNA can be detected in the serial dilution of 1:100 by DHPLC and 1:10 by direct sequencing respectively. The results from DHPLC showed 22 EGFR mutations were detected in 83 NSCLC patients, and only 19 mutation samples had been conformed by direct sequencing. Moreover, the other 61 samples were deemed as wild type by DHPLC and direct sequencing. The sensitivity and specificity of DHPLC was 100% and 95.13% respectively. The detection of the tumor specimens from CT-guided transthoracic needle lung biopsy, lymph node biopsy and surgical resection all showed high sensitivity and specificity. EGFR mutation has strong correlation with gender and pathologic type, but irrelevant to age and smoking status.
Conclusions:
DHPLC was a precise rapid preliminary screening method for detection of NSCLC EGFR genotype.
Insights
Denaturing high-performance liquid chromatography (DHPLC) offers a rapid and precise method for screening epidermal growth factor receptor (EGFR) mutations in non-small cell lung cancer (NSCLC) tumor specimens. This technique demonstrates high sensitivity and specificity, making it a valuable tool for preliminary genetic analysis.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Epidermal growth factor receptor (EGFR) mutations are crucial therapeutic targets in non-small cell lung cancer (NSCLC).
- Direct sequencing, the gold standard for EGFR mutation detection, is time-consuming, hyposensitive, and requires substantial tumor specimens.
- Rapid, sensitive, and specific methods are needed for efficient EGFR mutation screening in NSCLC.
Purpose of the Study:
- To evaluate Denaturing High-Performance Liquid Chromatography (DHPLC) as a rapid and accurate method for detecting EGFR mutations in NSCLC tumor specimens.
- To compare the performance of DHPLC against direct sequencing for EGFR mutation analysis.
Main Methods:
- DHPLC was employed to assess the accuracy and sensitivity of detecting serial dilutions of mutant and wild-type EGFR plasma DNA.
- DNA was extracted from 83 NSCLC frozen tumor specimens, followed by Polymerase Chain Reaction (PCR) amplification of EGFR exons 19 and 21.
- Results from DHPLC were directly compared with those obtained from direct sequencing.
Main Results:
- DHPLC detected mutant plasma DNA at a 1:100 dilution, significantly more sensitive than direct sequencing (1:10 dilution).
- DHPLC identified 22 EGFR mutations in 83 NSCLC patients, with 19 confirmed by direct sequencing; 61 samples were wild-type by both methods.
- DHPLC demonstrated 100% sensitivity and 95.13% specificity, with high accuracy across various biopsy types. EGFR mutation correlated with gender and pathologic type.
Conclusions:
- DHPLC serves as a precise and rapid preliminary screening method for identifying EGFR genotypes in NSCLC.
- The method's speed and accuracy support its utility in clinical settings for EGFR mutation detection.
