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Chemo-radiotherapy: radiosensitizing nucleoside analogues (review)
V Gregoire1, W N Hittelman, J F Rosier
1St-Luc University Hospital, Department of Radiation Oncology, 1200 Brussels, Belgium.
Oncology Reports
|July 30, 1999
Summary
Nucleoside analogues like fludarabine and gemcitabine show promise as radiosensitizers. They enhance radiation therapy by inhibiting DNA repair and synthesis, potentially improving cancer treatment outcomes.
Area of Science:
- Oncology
- Radiotherapy
- Pharmacology
Background:
- Nucleoside analogues are prodrugs that inhibit DNA synthesis and repair.
- Fludarabine and gemcitabine are key examples with potential radiosensitizing properties.
Purpose of the Study:
- To review the knowledge on nucleoside analogues as radiosensitizers, focusing on fludarabine and gemcitabine.
- To explore the mechanisms by which these analogues enhance radiation therapy efficacy.
Main Methods:
- Review of existing scientific literature on nucleoside analogues and radiosensitization.
- Analysis of experimental data and ongoing clinical trials.
Main Results:
- Nucleoside analogues inhibit DNA synthesis and repair, increasing DNA damage post-irradiation.
- They target S-phase cells, counteracting tumor repopulation and potentially overcoming hypoxia.
- Drug incorporation into DNA and induction of apoptosis are potential mechanisms.
Conclusions:
- Fludarabine and gemcitabine exhibit properties supporting their use as radiosensitizers.
- Further clinical evaluation is ongoing to confirm their therapeutic benefit in combination with radiation.