Urinary obstruction in prostate cancer patients from the Dutch trial (68 Gy vs. 78 Gy): relationships with local dose, acute effects, and baseline characteristics.

Research output: Contribution to journalArticle

  • External authors:
  • Wilma D Heemsbergen
  • Abrahim Al-Mamgani
  • Marnix G Witte
  • Marcel van Herk
  • Floris J Pos
  • Joos V Lebesque

Abstract

PURPOSE: To investigate the relationship between late urinary obstruction and the details of the dose distribution of irradiated prostate cancer patients, taking into account their baseline symptoms and acute complaints. PATIENTS AND METHODS: We selected patients from the Dutch multicenter trial randomized between 68 Gy and 78 Gy, for whom toxicity data and dose data were available (n = 557). The absolute dose surface parameters of the delineated bladder were calculated. Next, we constructed three-dimensional dose maps of the area around the prostate, providing an approximate identification of the corresponding anatomic locations. The dose difference maps were constructed by subtracting the mean dose maps of the patients with and without late urinary obstruction. Selected local dose points were analyzed using Cox regression analysis. RESULTS: Urinary obstruction was scored for 40 patients, including 19 of 296 patients who received 68-72 Gy and 21 of 261 patients who received 76-78 Gy. A total of 19 events occurred within 2 years after irradiation and 21 events after 2 years. The bladder surface receiving >or=80 Gy predicted (p

Bibliographical metadata

Original languageEnglish
JournalInternational journal of radiation oncology, biology, physics
Volume78
Issue number1
DOIs
Publication statusPublished - 1 Sep 2010