Published in:
Open Access
01-07-2009 | Original Article
Topoisomerase I and IIα protein expression in primary colorectal cancer and recurrences following 5-fluorouracil-based adjuvant chemotherapy
Authors:
Nicolas Tsavaris, Andreas Lazaris, Christos Kosmas, Panagiotis Gouveris, Nikolaos Kavantzas, Petros Kopterides, Thomas Papathomas, George Arapogiannis, Haralambos Zorzos, Vassiliki Kyriakou, Efstathios Patsouris
Published in:
Cancer Chemotherapy and Pharmacology
|
Issue 2/2009
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Abstract
Purpose
Human DNA topoisomerases I and II (topo-I and -II) are essential for vital cellular processes such as DNA replication, transcription, translation, recombination, and repair. In the present study, we correlate topo-I and -II expression and outcome after chemotherapy in primary and relapsed colorectal cancer.
Patients and methods
Patients with colorectal cancer that had recurred, following surgery and adjuvant chemotherapy and underwent a second operation were included in the present study. All had undergone surgical resection of the primary tumor and received post-operatively 5-FU-based (5FU + Leucovorin, Mayo Clinic regimen) adjuvant chemotherapy. Tumor tissue was collected at the initial operation from the primary tumor and at the time of recurrence (during the second operation following chemotherapy). All tissue samples were analyzed for levels of expression of both topo-I and topo-IIa using standard three-step immunohistochemistry on paraffin sections.
Results
Forty patients were included. Levels of expression of topo-I and topo-II were higher in malignant cells from tumor recurrences compared to primary tumors (P = 0.0001 for both). There was a statistically significant positive relationship between patients age and levels of topo-I (P = 0.011) and topo-II (P = 0.011) expression.
Conclusions
The study results reported here underscore the role of topoisomerase expression in colorectal cancer and suggest a potential role in tumor recurrence.