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Epidermal growth factor receptor mutations and response to chemotherapy in patients with non-small-cell lung cancer

Cited 24 time in Web of Science Cited 25 time in Scopus
Authors
Lee, Kyung-Hun; Han, Sae-Won; Hwang, Pil Gyu; Oh, Do-Youn; Kim, Dong-Wan; Chung, Doo Hyun; Im, Seock-Ah; Kim, Tae-You; Heo, Dae Seog; Bang, Yung-Jue
Issue Date
2006-06
Publisher
Oxford University Press
Citation
Japanese Journal of Clinical Oncology, Vol.36 No.6, pp.344-350
Keywords
EGFRmutationK-rasErkAkt
Abstract
Background: The association of epidermal growth factor receptor (EGFR) mutations with the response to conventional cytotoxic chemotherapeutic agents in non-small-cell lung cancer patients has not been investigated. We retrospectively analyzed the associations between response to chemotherapy and molecular markers associated with gefitinib responsiveness including EGFR mutations. Methods: EGFR (exons 18, 19 and 21) and K-ras mutations (exon 2) were studied by direct sequencing and p-Erk and p-Akt expressions were studied by immunohistochemistry in archival paraffin embedded tissues. Response rate (RR) and time-to-progression (TTP) of prior chemotherapy by platinum, paclitaxel and gemcitabine were analyzed with respect to the presence of EGFR and K-ras mutations, and p-Erk and p-Akt expressions. Results: Of 90 patients investigated, 75 received platinums and 45 received paclitaxel as first-line chemotherapy agents. The RRS and TTPS of platinum- and paclitaxel-containing regimens were not affected by EGFR or K-ras mutations, nor by p-Erk or p-Akt expression. Fifty-seven patients received gemcitabine as first- or second-line chemotherapy. RR was not affected by EGFR or K-ras mutations or by p-Akt expression. However, all responders to gemcitabine exhibited (+) p-Erk expression [RR 30.6% for p-Erk (+) versus 0% for p-Erk (-), P = 0.01]. TTP was not affected by EGFR or K-ras mutations or by p-Erk or p-Akt expression. Conclusions: EGFR mutations did not affect response to conventional chemotherapeutic agents, namely platinums, paclitaxel and gemcitabine. Our results also suggest that it may be undesirable to use gemcitabine in patients with tumors not expressing p-Erk.
ISSN
0368-2811
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=16818479

http://hdl.handle.net/10371/22569
DOI
https://doi.org/10.1093/jjco/hyl039
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College of Medicine/School of Medicine (의과대학/대학원)Internal Medicine (내과학전공)Journal Papers (저널논문_내과학전공)
College of Medicine/School of Medicine (의과대학/대학원)Cancer Research Institute (암연구소)Journal Papers (저널논문_암연구소)
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