The positive impact of cytological specimens for EGFR mutation testing in non-small cell lung cancer: a single South East Asian laboratory's analysis of 670 cases

Pang, B.; Matthias, D.; Ong, C. W.; Dhewar, A. N.; Gupta, S.; Lim, G. L.; Nga, M. E.; Seet, J. E.; Qasim, A.; Chin, T. M.; Soo, R.; Soong, R.; Salto‐Tellez, M.

doi:10.1111/j.1365-2303.2012.01000.x

Cited by 47Lung Cancer Treatments and MutationsLung Cancer Diagnosis and TreatmentCancer Genomics and Diagnostics

The positive impact of cytological specimens for EGFR mutation testing in non-small cell lung cancer: a single South East Asian laboratory's analysis of 670 cases

Pang, B., Matthias, D., Ong, C. W., Dhewar, A. N., Gupta, S., Lim, G. L., Nga, M. E., Seet, J. E. +5 more·2012·Cytopathology

DOI 10.1111/j.1365-2303.2012.01000.x

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Abstract

OBJECTIVES: To compare the rejection rates of non-small cell lung cancer (NSCLC) samples obtained by differing sampling methods for testing by Sanger sequencing for epidermal growth factor receptor (EGFR) mutations. To assess the association between unsatisfactory outcomes and the quantity of DNA extracted from cytological versus histological samples. METHODS: Six hundred and seventy NSCLC samples referred to our centre from 2008 to 2010 were reviewed as a consequence of sample rejection, presence of EGFR mutations, cytological versus histological sampling methods, DNA quantity and the unsatisfactory genotyping rate. RESULTS: Eighty samples were rejected for testing in similar proportions of histological and cytological samples (11.9% versus 10.9%) usually (n = 75) because the amount of cellular material was judged insufficient in small biopsies or cytology samples. The remaining 590 samples on which EGFR testing was attempted yielded 51 (8.6%) unsatisfactory test outcomes caused by failure of the polymerase chain reaction (PCR) (n = 47 cases), uninterpretable Sanger chromatograms (n = 3 cases) and insufficient DNA extracted for PCR (n = 1 case). The difference in rates of unsatisfactory outcomes between cytological samples (seven of 147 samples or 4.7%) versus tissue samples (44 of 443 samples or 9.9%) was clinically relevant but not statistically significant (Mann-Whitney test; P < 0.081). There was no association between the concentration of DNA extracted and the likelihood of an unsatisfactory analysis; which was similar in all types of sections (large and small) while 0% of 37 cytology slides were unsatisfactory. CONCLUSIONS: Utilizing cytology samples for EGFR testing avoids unnecessary patient re-biopsing and yields a clinically superior satisfactory rate to the overall satisfactory rate of tissue biopsies of NSCLC. The quality rather than quantity of DNA extracted may be a more important determinant of a satisfactory result.

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Molecular testing of biopsy and cytologic samples with adequate material yields similar failure rates.
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P221 The Use Of Cytological Specimens To Determine Epidermal Growth Factor Receptor (egfr) Mutation Status In Non-small Cell Lung Cancers (nsclc)
Jones, G., Frost, F. J., Lakhanpal, A., Smyth, C., Ledson, M. J., & Walshaw, M. J. (2014) · Thorax · doi:10.1136/thoraxjnl-2014-206260.350

Authors: Pang, B., Matthias, D., Ong, C. W., Dhewar, A. N., Gupta, S., Lim, G. L., Nga, M. E., Seet, J. E., Qasim, A., Chin, T. M., Soo, R., Soong, R., & Salto‐Tellez, M.
Affiliations: National University of Singapore (SG)
National University Health System (SG)
Queen's University Belfast (GB)
Corresponding author: Salto‐Tellez, M.
ORCID: Ong, C. W.
Soo, R.
Soong, R.
Salto‐Tellez, M.
Venue: Cytopathology
Publisher: Wiley
Published: 2012-07-17
Volume: 23
Issue: 4
Pages: 229-236
ISSN: 0956-5507 (ISSN-L)
1365-2303
DOI: 10.1111/j.1365-2303.2012.01000.x
OpenAlex: W1547332149
Cited by: 47
References: 21
Citations by year: 2021: 1 · 2020: 2 · 2018: 6 · 2017: 3 · 2016: 7 · 2015: 8 · 2014: 11 · 2013: 6 · 2012: 3
FWCI: 7.22
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations: Cytopathology (publishedVersion)
PubMed (publishedVersion)
National University of Singapore (submittedVersion)
Research Portal (Queen's University Belfast) (submittedVersion)
Topics: Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Diagnosis and Treatment
Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer Genomics and Diagnostics
Keywords: EGFR mutation testing, non-small cell lung cancer, cytology specimens, DNA quantity, Sanger sequencing
MeSH terms: Adenocarcinoma, Adult, Aged, Aged, 80 and over, Carcinoma, Non-Small-Cell Lung, Exons, Female, Humans, Male, Middle Aged, Mutation, ErbB Receptors

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The positive impact of cytological specimens for EGFR mutation testing in non-small cell lung cancer: a single South East Asian laboratory's analysis of 670 cases

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