Document Detail

Can dose-response models predict reliable normal tissue complication probabilities in radical radiotherapy of urinary bladder cancer? The impact of alternative radiation tolerance models and parameters.
MedLine Citation:
PMID:  11395229     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To analyze the consequences of selecting alternative normal tissue complication probability (NTCP) models and parameters for evaluation of radiotherapy of urinary bladder cancer. METHODS AND MATERIALS: Treatment plans of 24 bladder cancer patients referred to radical 4-field conformal radiotherapy were analyzed. Small intestinal and rectal NTCPs were determined using both the probit and relative seriality models with several sets of published radiation tolerance parameters. Various combinations of NTCP models and parameters were applied to find the prescription dose in individual patients as well as to estimate the benefit of the conformal radiotherapy setup. RESULTS: Different risk estimates were predicted from the two NTCP models, even when the same clinical radiation tolerance doses were fitted into the two models. The demonstrated variability translated into significant deviations (7-10 Gy) in the recommended prescription doses. Even if it was possible to discriminate between a 2-field plan and the 4-field conformal setup using a given complication model and set of tolerance parameters, the estimated benefit of the conformal treatment in terms of permitted dose escalation varied with as much as 10-12 Gy between the different NTCP models/parameters used. CONCLUSION: Different NTCP models and tolerance parameters might propose different answers to important clinical questions in radiotherapy treatment of bladder cancer, such as dose prescription and scoring of rival treatment plans. We therefore recommend that the variability caused by tolerance parameter uncertainty and model selection should be taken into account in dose-response modeling of radiotherapy treatment.
L P Muren; N Jebsen; A Gustafsson; O Dahl
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of radiation oncology, biology, physics     Volume:  50     ISSN:  0360-3016     ISO Abbreviation:  Int. J. Radiat. Oncol. Biol. Phys.     Publication Date:  2001 Jul 
Date Detail:
Created Date:  2001-06-07     Completed Date:  2001-06-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7603616     Medline TA:  Int J Radiat Oncol Biol Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  627-37     Citation Subset:  IM    
Department of Radiophysics, Haukeland University Hospital, Bergen, Norway.
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MeSH Terms
Dose Fractionation
Dose-Response Relationship, Radiation
Intestine, Small / radiation effects
Models, Biological*
Radiation Injuries / etiology
Radiation Tolerance*
Radiotherapy Planning, Computer-Assisted*
Radiotherapy, Conformal / adverse effects
Rectum / radiation effects
Retrospective Studies
Urinary Bladder Neoplasms / radiotherapy*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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