Abstract
A promising approach for cancer gene therapy is the combination of adenovirus vectors (AdV) with the suicide gene cytosine deaminase and uracil phosphoribosyl transferase (CD∷UPRT). While such vectors have been tested in tumor cell lines and xenograft models, it is not clear how these therapeutic vectors would perform in primary human tumors. We, thus, examined the effect of the combination of a recombinant adenovirus expressing the CD∷UPRT (AdCU) with 5-fluorocytosine (5-FC) on primary cancer cells isolated from the ascites or pleural fluids of patients with metastatic cancers. In such models, we have found a direct correlation between the patients' response to 5-FU and the response shown by the cancer cells in vitro, confirming the clinical relevance of this methodology. Our findings demonstrated that this combination was able to kill primary tumor cells, including those that had developed resistance to 5-FU. Furthermore, while proliferating cells were more susceptible to 5-FU, the combination was effective in both rapid and slow proliferating samples. Our study demonstrated that this gene therapy approach could provide an effective therapeutic option for cancers and is not affected by acquired 5-FU resistance. Also of importance is the effectiveness of this gene therapy approach on slower proliferating cells that is typical of the majority of cancers in vivo. This suggests a greater likelihood that it will be effective in a clinical setting.
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Disclosure of source of funds: This work was funded by grants from the Canadian Institute of Health Research (JT and WD) and the Prostate Cancer Research Foundation of Canada (WD).
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Richard, C., Duivenvoorden, W., Bourbeau, D. et al. Sensitivity of 5-fluorouracil-resistant cancer cells to adenovirus suicide gene therapy. Cancer Gene Ther 14, 57–65 (2007). https://doi.org/10.1038/sj.cgt.7700980
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DOI: https://doi.org/10.1038/sj.cgt.7700980
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