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Updated: Aug 19, 2026

Testing Targeted Therapies in Cancer using Structural DNA Alteration Analysis and Patient-Derived Xenografts
Published on: July 25, 2020
From bench to bedside for gene-directed enzyme prodrug therapy of cancer
Gabi U Dachs1, Joanna Tupper, Gillian M Tozer
1Angiogenesis Research Group, Department of Pathology, Christchurch School of Medicine and Health Sciences, University of Otago, Christchurch, New Zealand. gabi.dachs@chmeds.ac.nz
Abstract:
Gene therapy of cancer offers the possibility of a targeted treatment that destroys tumors and metastases, but not normal tissues. In gene-directed enzyme prodrug therapy (GDEPT), or suicide gene therapy, the gene encoding an enzyme is delivered to tumor cells, followed by administration of a prodrug, which is converted locally to a cytotoxin by the enzyme. The producer cells as well as surrounding bystanders are subsequently killed. Promising results have meant that suicide gene therapy has reached multicenter phase III clinical trials. This review will discuss the development, efficiency, mode of action and pharmacokinetics of seven GDEPT systems in vitro and in vivo. We will review the latest data of those systems in clinical trials (herpes simplex virus thymidine kinase/gancyclovir, bacterial cytosine deaminase/5-fluorocytosine, bacterial nitroreductase/CB1954 and cytochrome P450/cyclophosphamide), as well as the development of more recent and experimental systems which are not yet in clinical trials (P450 reductase/tirapazamine, carboxypeptidase/CMDA, horseradish peroxidase/indole-3-acetic acid or paracetamol and others).
Insights
Gene-directed enzyme prodrug therapy (GDEPT) uses gene therapy to target cancer cells. This approach converts prodrugs into toxins, killing tumor cells and nearby cancer cells effectively.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Gene therapy offers targeted cancer treatment, aiming to destroy tumors and metastases while sparing normal tissues.
- Gene-directed enzyme prodrug therapy (GDEPT), also known as suicide gene therapy, involves delivering an enzyme gene to tumor cells.
Purpose of the Study:
- To review the development, efficiency, mode of action, and pharmacokinetics of seven GDEPT systems.
- To discuss the latest clinical trial data for established GDEPT systems and emerging experimental ones.
Main Methods:
- In vitro and in vivo evaluation of GDEPT systems.
- Review of clinical trial data for GDEPT in cancer treatment.
Main Results:
- GDEPT systems have shown promising results, advancing to multicenter phase III clinical trials.
- Various GDEPT systems are under investigation, including those in clinical trials and experimental stages.
Conclusions:
- GDEPT represents a promising strategy for targeted cancer therapy.
- Continued research into GDEPT systems holds potential for improved cancer treatment outcomes.
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