Expression of ERCC1 and its clinicopathological correlations in non-small cell lung cancer
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Excision Repair Cross-Complementing Group 1 (ERCC1) is an important DNA repair gene, playing critical role in nucleotide excision repair pathway and having a significant influence on genomic instability. Some studies support that ERCC1 might be a potential predictive and prognostic marker in non-small cell lung cancer (NSCLC). ERCC1 has also been shown to be a promising biomarker in NSCLC treated with a cisplatin-based regimen. Therefore, the determination of ERCC1 expression at DNA, mRNA and protein level in different stages of NSCLC is still an important topic in the cancer. Ninety-one formalin-fixed paraffin-embedded tumor samples histopathologically diagnosed as NSCLC were examined in this study. ERCC1 expression at protein level were scored by immunohistochemistry. The gene amplification and mRNA expression levels for ERCC1 were determined by real-time quantitative PCR. There was complete concordance among the three methods in 39 tumor samples (42.9%). A strong correlation was found between DNA amplification and mRNA expression (r = 0.662) while there was no correlation between mRNA and protein assessment for ERCC1 expression (r = −0.013). ERCC1 expression at mRNA and DNA level (63.1 and 84.2%, respectively) in tumors at stage III was higher than at the other stages. In contrast, the protein expression at stage II and III (56.6 and 52.6%, respectively) of NSCLC was lower than that of tumors with stage I NSCLC. These results show that the mechanism by which ERCC1 expression might play a role in tumor behavior. This study was also confirmed that the appropriate validation and qualification in methods used for ERCC1 status were needed before its clinical application and implementation.
KeywordsERCC1 Non-small cell lung cancer IHC Real-time quantitative PCR
The authors wish to acknowledge the financial support provided by a grant from The Scientific and Technological Research Council of Turkey, TUBITAK (Grant No. 109S022).
- 2.Ministry of Health Republic of Turkey (2009) Cancer statistics in Turkey. http://www.kanser.gov.tr. Accessed Dec 2010
- 11.Scheil-Bertram S, Tylus-Schaaf P, du Bois A, Harter P, Oppitz M, Ewald-Riegler N, Fisseler-Eckhoff A (2010) Excision repair cross-complementation group 1 protein overexpression as a predictor of poor survival for high-grade serous ovarian adenocarcinoma. Gynecol Oncol 119(2):325–331PubMedCrossRefGoogle Scholar
- 18.Travis WD, Brambilla E, Müller-Hermelink HK, Haris CC (2004) Tumours of the lung. In: World Health Organization classification of tumours: pathology & genetics—tumours of lung, pleura, thymus, and heart. IARC Press, Lyon, pp 10–11Google Scholar
- 25.Yu JJ, Mu C, Lee KB (2006) A nucleotide polymorphism in ERCC1 in human ovarian cancer cell lines and tumor tissues. Mutat Res 382:13–20Google Scholar