Abstract
Purpose
Our aim was to investigate whether chemotherapy with 5-FU induces an alteration in the levels of topoisomerase I (topo I) in colorectal neoplastic tissues
Methods
Twenty-five colorectal cancer patients were included in our study; these had undergone surgical resection of the primary tumor, received post-operatively 5-FU-based adjuvant chemotherapy and then suffered from recurrences. In a standard three-step immunohistochemical procedure, a monoclonal antibody to topo I was applied in both specimens from each patient (one from the primary location and a second one from the recurrence). Statistical analysis was subsequently performed.
Results
Malignant cells from the recurrences displayed a statistical significant increase, concerning the levels of topoisomerase I, by comparison with the primary tumors (P = 0.01). The increase in topo I levels did not demonstrate significant correlations with Duke’s stage (Fisher’s Exact Test P value = 0.496), differentiation grade (P value = 0.661), localization (P value = 0.072), patient sex (P value = 0.434), nor with relapse free interval (P value = 0.493). There was a statistically significant relationship between the age of patients and increase in topo I levels (P = 0.011).
Conclusions
Topo I expression may be part of the malignant cells’ phenotype in recurrent colorectal carcinomas, suggesting a potential role for Topo I in the acquisition of a metastatic phenotype. The increase of topo I immunohistochemical status is likely to be attributed to 5-FU and given the fact that high levels of topo I correlate with sensitivity to camptothecin, advanced colorectal cancer patients seem to benefit from topo I targeted anticancer drug therapy.
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Gouveris, P., Lazaris, A.C., Papathomas, T.G. et al. Topoisomerase I protein expression in primary colorectal cancer and recurrences after 5-FU-based adjuvant chemotherapy. J Cancer Res Clin Oncol 133, 1011–1015 (2007). https://doi.org/10.1007/s00432-007-0253-6
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DOI: https://doi.org/10.1007/s00432-007-0253-6