PURPOSE: To explore the outcome, cumulative dose and toxicity in 23 patients after a third radiation treatment, with a partial or complete overlap of the previous two irradiated regions. METHODS AND MATERIAL: The dose summation of the three radiation plans was made by the planning system. For patients treated with cyberknife or brachytherapy dose summation was done by dose point calculations. Efficacy and toxicity was scored by looking at the reduction of tumor, pain and bleeding. RESULTS: Symptomatic response was observed in 81% and 73% of the patients after, respectively, the third and second radiation. The median cumulative maximum dose to the tumor and its regions was 133Gy(3) (range: 82-496Gy(3)). The median corrected cumulative dose for the rectum, bowel and bladder resulted in 91Gy(3), 73Gy(3) and 79Gy(3), respectively. Grade 3 acute skin toxicity was only seen in the third radiation course. CONCLUSION: The constraints of 100Gy(3) for rectum, 90Gy(3) for bowel and 110Gy(3) for bladder are safe and can be used as guidelines in the decision for re-irradiation. Symptomatic relieve was seen in 81% of the patients with low grade 3 and no grade 4 acute and late toxicity.
PURPOSE: To explore the outcome, cumulative dose and toxicity in 23 patients after a third radiation treatment, with a partial or complete overlap of the previous two irradiated regions. METHODS AND MATERIAL: The dose summation of the three radiation plans was made by the planning system. For patients treated with cyberknife or brachytherapy dose summation was done by dose point calculations. Efficacy and toxicity was scored by looking at the reduction of tumor, pain and bleeding. RESULTS: Symptomatic response was observed in 81% and 73% of the patients after, respectively, the third and second radiation. The median cumulative maximum dose to the tumor and its regions was 133Gy(3) (range: 82-496Gy(3)). The median corrected cumulative dose for the rectum, bowel and bladder resulted in 91Gy(3), 73Gy(3) and 79Gy(3), respectively. Grade 3 acute skin toxicity was only seen in the third radiation course. CONCLUSION: The constraints of 100Gy(3) for rectum, 90Gy(3) for bowel and 110Gy(3) for bladder are safe and can be used as guidelines in the decision for re-irradiation. Symptomatic relieve was seen in 81% of the patients with low grade 3 and no grade 4 acute and late toxicity.
Authors: Brane Grambozov; Markus Stana; Bernhard Kaiser; Josef Karner; Sabine Gerum; Elvis Ruznic; Barbara Zellinger; Raphaela Moosbrugger; Michael Studnicka; Gerd Fastner; Felix Sedlmayer; Franz Zehentmayr Journal: Cancers (Basel) Date: 2022-01-23 Impact factor: 6.639
Authors: Brane Grambozov; Evelyn Nussdorfer; Julia Kaiser; Sabine Gerum; Gerd Fastner; Markus Stana; Christoph Gaisberger; Romana Wass; Michael Studnicka; Felix Sedlmayer; Franz Zehentmayr Journal: Curr Oncol Date: 2021-05-13 Impact factor: 3.677