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Using protein microarray as a diagnostic assay for non-small cell lung cancer.
Li Zhong1, Giovanna E Hidalgo, Arnold J Stromberg
1Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Kentucky, Chandler Medical Center, K528 Kentucky Clinic, 740 S. Limestone, Lexington, Kentucky 40536, USA. lzhon2@uky.edu
American Journal of Respiratory and Critical Care Medicine
|August 20, 2005
Summary
Lung cancer diagnosis benefits from measuring multiple markers due to tumor heterogeneity. A fluorescent protein microarray assay identified seven key antibodies, achieving 90% sensitivity and 95% specificity for non-small cell lung cancer detection.
Area of Science:
- Biomarker discovery
- Immunology
- Oncology
Background:
- Lung cancer exhibits significant phenotypic and genotypic heterogeneity.
- A single predictive marker is insufficient for accurate diagnosis.
- Multiple marker identification and measurement are crucial for effective lung cancer diagnostics.
Purpose of the Study:
- To develop a diagnostic assay for non-small cell lung cancer (NSCLC).
- To utilize a fluorescent protein microarray for identifying and measuring multiple NSCLC-associated antibodies.
- To combine simultaneous antibody measurements into a single, accurate diagnostic assay.
Main Methods:
- Construction and biopanning of T7 phage cDNA libraries from NSCLC.
- High-throughput screening of phage-expressed proteins using patient plasma.
- Statistical analysis to identify significant antibody reactivity and determine predictive value.
Main Results:
- Identification of 212 immunogenic phage-expressed proteins.
- Statistical analysis revealed seven proteins with significantly different antibody reactivity between NSCLC patients and normal subjects (p < 0.01).
- A logistic regression model combining the 5 most predictive markers achieved 90% sensitivity and 95% specificity for NSCLC prediction.
Conclusions:
- Antibody profiling using phage display is a promising approach for NSCLC diagnosis.
- Simultaneous measurement of multiple markers can enhance diagnostic accuracy.
- This method offers a potential strategy for improving early detection and management of NSCLC.