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Volume 19, Number 5, 2014

Early closure of phase II prospective study on acute and late tolerance of hypofractionated radiotherapy in low-risk prostate cancer patients

Katarzyna Behrendt, Elżbieta Nowicka, Marzena Gawkowska-Suwińska, Grzegorz Plewicki, Beata Smolska-Ciszewska, Monika Giglok, Rafał Suwiński, Aleksander Zajusz



To assess acute and late toxicity of hypofractionated radiotherapy, its efficacy and impact on quality of life in patients with low-risk prostate cancer.

Materials and methods

Since August 2006 to October 2007, 15 prostate cancer patients with favorable clinical features, aged 54–74 years (mean 67 years) entered the study. Tumor stage in the majority (73%) of patients was T2a, the mean pretreatment PSA value was 7.2 ng/ml (range 5–10.9 ng/ml). The study group was treated 3 times a week with 4 Gy per fraction to the total dose of 60 Gy within 5 weeks. 3D conformal treatment planning was used with no fiducial markers. Acute and late toxicity was evaluated using modified EORTC/RTOG/LENT scoring systems. Patients regularly filled the EORTC QLQ-PR25 questionnaires.


All patients completed radiotherapy according to the plan. During radiotherapy, 26% of patients had grade 1–2 rectal symptoms. The incidence of acute urinary toxicity score was 26%, 60%, and 14% for grade 0–1, 2 and 3, respectively. One year after RT, the incidence of grade 2 GI toxicity was 27%, which was the reason for an early closure of the accrual. Grade 2 late urinary toxicity was noted in 20% of patients. The mean PSA level was 0.61 ng/ml after 24 months and 0.47 ng/ml after 36 months (range: 0.06–1.54 ng/ml).


Low number of patients does not allow to determine the influence of hypofractionation on unsatisfactory tolerance of this regimen. Suboptimal (from the present day's perspective) target localization (no fiducial markers) could potentially explain higher than expected late GI reactions in our series.

Signature: Rep Pract Oncol Radiother, 2014; 19(5) : 337-342

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