首页 | 本学科首页   官方微博 | 高级检索  
     


The effect of time interval between radiotherapy and hyperthermia on planned equivalent radiation dose
Authors:C. M. van Leeuwen  J. Crezee  A. L. Oei  N. A. P. Franken  L. J. A. Stalpers  A. Bel
Affiliation:1. Department of Radiation Oncology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands;2. Laboratory for Experimental Oncology and Radiobiology (LEXOR)/Center for Experimental Molecular Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
Abstract:
Purpose: Thermoradiotherapy is an effective treatment for locally advanced cervical cancer. However, the optimal time interval between radiotherapy and hyperthermia, resulting in the highest therapeutic gain, remains unclear. This study aims to evaluate the effect of time interval on the therapeutic gain using biological treatment planning.

Methods: Radiotherapy and hyperthermia treatment plans were created for 15 cervical cancer patients. Biological modeling was used to calculate the equivalent radiation dose, that is, the radiation dose that results in the same biological effect as the thermoradiotherapy treatment, for different time intervals ranging from 0–4?h. Subsequently, the thermal enhancement ratio (TER, i.e. the ratio of the dose for the thermoradiotherapy and the radiotherapy-only plan) was calculated for the gross tumor volume (GTV) and the organs at risk (OARs: bladder, rectum, bowel), for each time interval. Finally, the therapeutic gain factor (TGF, i.e. TERGTV/TEROAR) was calculated for each OAR.

Results: The median TERGTV ranged from 1.05 to 1.16 for 4?h and 0?h time interval, respectively. Similarly, for bladder, rectum and bowel, TEROARs ranged from 1–1.03, 1–1.04 and 1–1.03, respectively. Radiosensitization in the OARs was much less than in the GTV, because temperatures were lower, fractionation sensitivity was higher (lower α/β) and direct cytotoxicity was assumed negligible in normal tissue. TGFs for the three OARs were similar, and were highest (around 1.12) at 0?h time interval.

Conclusion: This planning study indicates that the largest therapeutic gain for thermoradiotherapy in cervical cancer patients can be obtained when hyperthermia is delivered immediately before or after radiotherapy.
Keywords:Radiotherapy  hyperthermia  treatment planning  biological modeling  time interval
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号