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EGFR gene status in cytological samples of nonsmall cell lung carcinoma†
Controversies and opportunities
Article first published online: 11 MAR 2011
Copyright © 2011 American Cancer Society
Volume 119, Issue 2, pages 80–91, 25 April 2011
How to Cite
da Cunha Santos, G., Saieg, M. A., Geddie, W. and Leighl, N. (2011), EGFR gene status in cytological samples of nonsmall cell lung carcinoma. Cancer Cytopathology, 119: 80–91. doi: 10.1002/cncy.20150
We thank the University Health Network Molecular Diagnostics Laboratory for providing the photographs from the mutation assays.
- Issue published online: 13 APR 2011
- Article first published online: 11 MAR 2011
- Manuscript Revised: 3 FEB 2011
- Manuscript Accepted: 3 FEB 2011
- Manuscript Received: 23 DEC 2010
- Terry Fox Foundation Strategic Health Research Training Program. Grant Number: TGT-53,912
- EGFR genes;
- DNA mutational analysis;
- fluorescent in situ hybridization;
- fine-needle aspiration;
- nonsmall cell lung carcinoma;
In nonsmall cell lung cancer (NSCLC), the development and clinical application of tyrosine kinase inhibitors (TKIs) targeting the epidermal growth factor receptor (EGFR) has required the investigation of EGFR status by gene copy number and/or mutation analysis. This review aimed to present the current knowledge of the use of cytological specimens for EGFR testing in lung cancer.
A systematic computerized search was performed of the MEDLINE(R) and EMBASE databases to identify articles reporting the use of cytological samples for determining EGFR status in NSCLC.
Data were extracted from 30 original articles. An additional 19 reviews, consensus statements, and editorials were selected from 175 retrieved papers. Different techniques using cell blocks, scraped cells from archival slides, and fresh cells have shown promising results and include fluorescent in situ hybridization (FISH), direct sequencing, and quantitative polymerase chain reaction (PCR), with similar or higher accuracy and sensitivity than surgical specimens. Preservation and quality of the extracted DNA seem to matter more than the actual number of tumor cells present in the samples. However, major issues still reside in the amount of material, the interference from background non-neoplastic cells, and standardization of parameters for cytological samples.
This analysis provided evidence that cytological material is suitable for detecting EGFR status using several different methodologies and preparations. New prospective, clinical studies are encouraged for collection and handling of cytological samples as well as for validation of novel techniques in large cohorts. Cancer (Cancer Cytopathol) 2011;. © 2011 American Cancer Society.