Related Experiment Videos
Evidence for adaptive response and implication in pulse-simulated low-dose-rate radiotherapy
G P Raaphorst1, C E Ng, D Smith
1Medical Physics Department, Ottawa Regional Cancer Centre, Ottawa, Ontario, Canada. graaphorst@orcc.on.ca
International Journal of Radiation Oncology, Biology, Physics
|November 10, 2000
Summary
Human cells can adapt to radiation therapy, potentially impacting pulsed-dose-rate (PDR) brachytherapy outcomes. This adaptive response varied among cell lines and was observed with PDR treatments.
Area of Science:
- Radiation Oncology
- Cell Biology
- Cancer Research
Background:
- Pulsed-dose-rate (PDR) brachytherapy offers clinical advantages over continuous low-dose-rate (LDR) brachytherapy.
- Early observations suggest cells may develop an adaptive response to radiation, potentially influencing PDR treatment efficacy.
Purpose of the Study:
- To investigate the adaptive response of human cell lines to radiation.
- To determine if PDR brachytherapy sequences elicit an adaptive response in human cells.
Main Methods:
- Nine human cell lines (two normal fibroblasts, seven tumors) were exposed to single adapting doses or PDR sequences.
- Colony survival assays were used to assess cellular response to radiation treatments.
Main Results:
- Five of nine cell lines exhibited an adaptive response to single low-dose radiation.
- Two cell lines (ovarian carcinoma, glioma) showed an adaptive response to PDR, dependent on pulse size and interval.
Conclusions:
- Human cells demonstrate an adaptive response to radiation, with variability among cell types.
- PDR brachytherapy can induce an adaptive response, which may affect clinical outcomes in PDR therapy.