Hypofractionated versus conventionally fractionated radiation therapy for prostate carcinoma: Updated results of a phase III randomized trial

Eric E. Yeoh, Richard H. Holloway, Robert J. Fraser, Rochelle J. Botten, Addolorata C. Di Matteo, Julie Butters, Sujeeva Weerasinghe, Prasad Abeysinghe

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140 Citations (Scopus)

Abstract

Purpose: The aim of this study was to compare the toxicity and efficacy of radiation therapy (RT) for localized carcinoma of the prostate, using a hypofractionated (55 Gy/20 fractions/4 weeks) vs. a conventionally fractionated (64 Gy/32 fractions/6.5 weeks) dose schedule. Methods and Materials: A total of 217 patients were randomized to either the hypofractionated (108 patients) or the conventional (109 patients) dose schedule, with planning with two-dimensional (2D) CT scan planning methodology in the majority of cases. All patients were followed for a median of 48 (6-108) months. Gastrointestinal (GI) and genitourinary (GU) toxicity was evaluated before RT and after its completion using modified late effects of normal tissue-subjective, objective, management, analytic (LENT-SOMA) scales and the European Organization for Research and Treatment of Cancer sexual function questionnaire. Efficacy of RT based on clinical, radiologic, and prostate-specific antigen data were also evaluated at baseline and after RT. Results: Gastrointestinal and GU toxicity persisted 5 years after RT and did not differ between the two dose schedules other than in regard to urgency of defecation. However, 1-month GI toxicity was not only worse in patients with the hypofractionated RT schedule but also adversely affected daily activities. Nadir prostate-specific antigen values occurred at a median of 18.0 (3.0-54.0) months after RT. A total of 76 biochemical relapses, with or without clinical relapses, have occurred since; of these, 37 were in the hypofractionated and 39 in the conventional schedule. The 5-year biochemical ± clinical relapse-free and overall survival was 55.9% and 85.3% respectively for all patients, and did not differ between the two schedules. Conclusions: Radiation therapy for prostate carcinoma causes persistent GI toxicity that is largely independent of the two dose schedules. The hypofractionated schedule is equivalent in efficacy to the conventional schedule.

Original languageEnglish
Pages (from-to)1072-1083
Number of pages12
JournalInternational Journal of Radiation Oncology Biology Physics
Volume66
Issue number4
DOIs
Publication statusPublished - 15 Nov 2006
Externally publishedYes

Keywords

  • Hypofractionation
  • LENT/SOMA toxicity scales
  • Prostate carcinoma
  • Quality of life
  • Radiation therapy

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research

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