Abstract：
:Epidermal growth factor receptor (EGFR) exon 18-21 mutations were shown to be highly predictive of response to gefitinib (Iressa) therapy in lung cancer. Studies on Western and Japanese lung cancers have indicated substantial differences in the EGFR mutation frequency between these populations. To investigate the prevalence of EGFR in another distinct ethnic group, EGFR alterations were studied in 47 consecutive non small cell lung cancers from Saudi Arabia by immunohistochemistry, fluorescence in situ hybridization, and DNA sequencing. Detectable EGFR expression was seen in 69.8% of 43 interpretable cancers. Epidermal growth factor receptor amplification, present in 15.3% of 39 analyzable cancers, was strongly associated with high levels of EGFR expression (P = .0047). Only 1 exon 18-21 mutation was seen among 34 lung cancers that could be successfully sequenced. It is concluded that EGFR exon 18-21 mutations are rare in Middle East patients with lung cancer and occur in a similar range as in Western patients. The remarkable high rate of EGFR gene amplifications could potentially facilitate studies on the predictive role of gene copy number changes for response to anti-EGFR therapies in Middle East patient sets.
journal_name
Hum Patholjournal_title
Human pathologyauthors
Al-Kuraya K,Siraj AK,Bavi P,Al-Jommah N,Ezzat A,Sheikh S,Amr S,Al-Dayel F,Simon R,Guido Sdoi
10.1016/j.humpath.2005.12.004subject
Has Abstractpub_date
2006-04-01 00:00:00pages
453-7issue
4eissn
0046-8177issn
1532-8392pii
S0046-8177(05)00709-4journal_volume
37pub_type
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