The purpose of this study is to develop a real-time diagnostic technique with e- Ab sensor for specific EGFR mutation detection in clinical specimens of NSCLC patients, the investigators conduct a prospective clinical study. In comparison with results from direct sequencing of EGFR, the investigators evaluate the performance of e- Ab sensor, including reproducibility, sensitivity, specificity, and cross-reaction (such as detection of EGFR mutations other than L858R and DelL746-A750). The potential factors which may interfere with the results would be investigated. With such technique, the investigators can obtain EGFR mutation information of NSCLC patients in cost-saving and time-saving way and can offer more individualized treatment for the investigators patients.
Name: Electrosensing antibody probing system (e- Ab sensing)
Description: Electrosensing antibody probing system (e- Ab sensing), which was developed for the rapid and sensitive detection of hapten, proteins or viral antigen in medical samples, will be used for analyzing the interaction kinetics between mutation-specific anti-EGFR and its antigen mutant EGFR present in NSCLC. The system incorporates the use of engineered semiconductive antibodies or virus in vertical and lateral chip (eAbchip) or lateral flow through (eAbsignal) formats. In electrosensing antibody probing, semiconductive antibodies are bound as a suitable electrosensing probe which specifically and selectively binds mutant EGFR polypeptide target molecules in the test specimen.Type: DeviceElectrosensing antibody probing system (e- Ab sensing)
Description: In comparison with results from direct sequencing of EGFR, we evaluate the performance of e- Ab sensor, including reproducibility, sensitivity, specificity, and cross-reaction (such as detection of EGFR mutations other than L858R and DelL746-A750)
Measure: The performance of e- Ab sensor Time: 1 daySingle Group Assignment
There is one SNP
In comparison with results from direct sequencing of EGFR, the investigators evaluate the performance of e- Ab sensor, including reproducibility, sensitivity, specificity, and cross-reaction (such as detection of EGFR mutations other than L858R and DelL746-A750). --- L858R ---
In comparison with results from direct sequencing of EGFR, we evaluate the performance of e- Ab sensor, including reproducibility, sensitivity, specificity, and cross-reaction (such as detection of EGFR mutations other than L858R and DelL746-A750). --- L858R ---
However, only some EGFR mutations are associated with sensitivity to tyrosine kinase inhibitor treatment, especially deletion in exon 19 and L858R mutation in exon 21.4-5 Two recent phase III randomized clinical trials evaluated gefitinib treatment and chemotherapy in patients of advanced NSCLC with sensitive EGFR mutaions.6-7 --- L858R ---
8 For detection for specific EGFR mutations, mutation-specific monoclonal antibodies were developed to detect E746-A750 deletion in exon 19 and L858R in exon 21. --- L858R ---
In the study by Akhiko Kawahara et al, IHC assay of NSCLC tumor specimens with anti-delE746-A750 antibody showed a sensitivity of 79%, which was 83% by IHC assay with anti-L858R antibody.10 --- L858R ---
IHC assay with anti-L858R antibody also showed high specificity but low sensitivity (97% and 36%, respectively). --- L858R ---
For anti-L858R antibody, the sensitivity was 76%-95% and the positive predicted value was 99%-100%. --- L858R ---
Electrosensing antibody probing system (e- Ab sensor), which was developed for the rapid and sensitive detection of hapten, proteins, or viral antigen in medical samples, will be used for analyzing the interaction kinetics between mutation specific anti-EGFR and its antigen (EGFR with E746-A750 deletion or L858R mutation) present in the specimens of patients with lung cancer. --- L858R ---
In comparison with results from direct sequencing of EGFR, we evaluate the performance of e- Ab sensor, including reproducibility, sensitivity, specificity, and cross-reaction (such as detection of EGFR mutations other than L858R and DelL746-A750). --- L858R ---