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Open Access Highly Accessed Research article

Relationship between EGFR expression, copy number and mutation in lung adenocarcinomas

Zhiyong Liang, Jing Zhang, Xuan Zeng, Jie Gao, Shafei Wu and Tonghua Liu*

Author Affiliations

Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Beijng 100730, China

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BMC Cancer 2010, 10:376  doi:10.1186/1471-2407-10-376

Published: 19 July 2010

Abstract

Background

This study was designed to investigate EGFR protein expression, EGFR copy number and EGFR mutations in lung adenocarcinomas, to explore the relationship of the three markers.

Methods

EGFR status was analyzed in surgically resected lung adenocarcinoma samples from 133 Chinese patients by three methods: protein expression (n = 133) by standardized immunohistochemistry (IHC), gene copy number (n = 133) by fluorescence in situ hybridization (FISH), and mutation analysis using the Scorpion amplification refractory mutation system (ARMS) (n = 133).

Results

The results showed that 68.4% of the samples were positive by IHC, 42.1% were positive by FISH, and 63.9% contained activating kinase domain mutations. EGFR mutations were more frequent in non-smoking patients (p = 0.008), and EGFR mutations were associated with EGFR FISH positivity (p < 0.0001). When using 10% positivity and 2+ as cutoffs, EGFR protein expression was significantly correlated with EGFR FISH positivity (p = 0.012) and EGFR mutations (p = 0.008) after Bonferroni correction.

Conclusion

EGFR protein expression, EGFR copy number and EGFR mutations were closely related to each other. Standard methods and interpretation criteria need to be established.