Expression of ERCC1 and its clinicopathological correlations in non-small cell lung cancer |
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Authors: | Emre Tepeli Vildan Caner Nur Büyükp?narba??l? G Ozan ?etin Füsun Düzcan Levent Elmas Gülseren Ba?c? |
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Institution: | (1) School of Medicine, Department of Genetics, Pamukkale University, Doktorlar Cad. Kat:3, Bayramyeri, Denizli, Turkey;(2) School of Medicine, Department of Medical Biology, Pamukkale University, Morfoloji Binasi Kat:3, Kinikli, Denizli, Turkey;(3) Department of Pathology, Yedikule Chest Diseases Hospital, Istanbul, Turkey |
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Abstract: | 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. |
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