Cancer Research and Treatment

Original Articles

Peptide Nucleic Acid Clamping Versus Direct Sequencing for the Detection of EGFR Gene Mutation in Patients with Non-small Cell Lung Cancer: Seong-Hoon Yoon, Yoo-Duk Choi, In-Jae Oh, Kyu-Sik Kim, Hayoung Choi, Jinsun Chang, Hong-Joon Shin, Cheol-Kyu Park, Young-Chul Kim; Cancer Res Treat. 2015;47(4):661-669. Published online February 23, 2015; DOI: https://doi.org/10.4143/crt.2014.282

Purpose
Direct sequencing (DS) is the standard method for detection of epidermal growth factor receptor (EGFR) gene mutation in non-small cell lung cancer (NSCLC); however, low detection sensitivity is a problem. The aim of this study is to demonstrate higher detection rate of EGFR gene mutation with peptide nucleic acid (PNA) clamping compared with DS. Materials and Methods This is a single arm, prospective study for patients with stage IIIB/IV or relapsed NSCLC. Using tumor DNA from 138 patients, both DS and PNA clamping for EGFR gene in exon 18, 19, 20, and 21 were performed. Discrepant results between the two methods were verified using Cobas and a mutant enrichment based next generation sequencing (NGS). Patients with activating mutations were treated with EGFR tyrosine kinase inhibitor (EGFR-TKI, gefitinib, or erlotinib) as first line treatment.
Results
Of 138 paired test sets, 24 (17.4%) and 45 (32.6%) cases with activating mutations were detected by DS and PNA clamping, respectively. The difference of detection rate between the two methods was 15.2% (95% confidence interval, 8.7% to 17.8%; p < 0.001). Between the two methods, 25 cases showed discrepant results (n=23, PNA+/DS–; n=2, PNA–/DS+). Mutations were confirmed by Cobas or NGS in 22 of 23 PNA+/DS– cases. The response rates to EGFR-TKI were 72.2% in the PNA+/DS+ group and 85.0% in the PNA+/DS– group. Conclusion PNA clamping showed a significantly higher detection rate of EGFR gene mutation compared with DS. Higher sensitivity of PNA clamping was not compromised by the loss of predictive power of response to EGFR-TKI.

Citations

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Bronchial brushing cytology is comparable to bronchial biopsy for epidermal growth factor receptor mutation test in non-small cell lung cancer
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Potential applications of peptide nucleic acid in biomedical domain
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Engineering Reports.2020;[Epub] CrossRef
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Results of Curative Radiation Therapy with or without Chemotherapy for Stage III Unresectable Non-Small Cell Lung Cancer: Sung-Ja Ahn, Young-Chul Kim, Kyu-Sik Kim, Kyung-Ok Park, Woong-Ki Chung, Taek-Keun Nam, Byung-Sik Nah, Ju-Young Song, Mi-Sun Yoon; Cancer Res Treat. 2005;37(5):268-272. Published online October 31, 2005; DOI: https://doi.org/10.4143/crt.2005.37.5.268

Abstract PDF PubReader ePub

Purpose

We retrospectively analyzed the patients who received curative radiotherapy for unresectable stage III NSCLC to investigate the impact of chemotherapy.

Materials and Methods

From 1998 to 2001, the records of 224 patients who completed curative radiotherapy for NSCLC were reviewed. There were 210 males and 14 females, and their median age was 64 years (range 38~83). 54 patients had stage IIIA disease and 170 patients had stage IIIB disease. Conventional radiotherapy was given and the radiation dose ranged from 50~70 Gy with a median of 60 Gy, and chemotherapy was combined for 116 patients (52%).

Results

The median survival, the 2-year, and 5-year actuarial survival rates of all 224 patients were 15 months, 30%, and 7%, respectively. The median survival of the patients with stage IIIA and IIIB disease were 21 months and 13 months, respectively (p=0.14). The median survival of patients who received chemoradiation was 18 months compared to 14 months for the patients who received RT alone (p=0.02). Among the chemoradiation group of patients, the median survival time of the patients who received 1 to 3 cycles of chemotherapy was 16 months and that for the patients who received more than 3 cycles was 22 months (p=0.07). We evaluated the effects of the timing of chemoradiation in 57 patients who received more than 3 cycles of chemotherapy. The median survival of the patients with the concurrent sequence was 25 months and that for the patients with the sequential chemotherapy was 19 months (p=0.81).

Conclusions

For advanced stage III non-small cell lung cancer patients who completed the curative radiotherapy, the addition of chemotherapy improved the survival compared to the patients who received radiotherapy alone.

Citations

Citations to this article as recorded by

Treatment for Non-Small-Cell Lung Cancer and Circulating Tumor Cells
Joel Mason, Benjamin Blyth, Michael P MacManus, Olga A Martin
Lung Cancer Management.2017; 6(4): 129. CrossRef
Clinical Responses and Prognostic Indicators of Concurrent Chemoradiation for Non-small Cell Lung Cancer
Dong-Soo Lee, Yeon-Sil Kim, Jin-Hyoung Kang, Sang-Nam Lee, Young-Kyoun Kim, Myung-Im Ahn, Dae-Hee Han, Ie-Ryung Yoo, Young-Pil Wang, Jae-Gil Park, Sei-Chul Yoon, Hong-Seok Jang, Byung-Oak Choi
Cancer Research and Treatment.2011; 43(1): 32. CrossRef

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