- 作者：Daniel A. Hamstra ; MD ; PhD&lowast ; ; Matt H. Stenmark ; MD&lowast ; ; &dagger ; ; Tim Ritter ; PhD&lowast ; ; &dagger ; ; Dale Litzenberg ; PhD&lowast ; ; William Jackson ; BS&lowast ; ; Skyler Johnson ; BS&lowast ; ; Liesel Albrecht-Unger ; BS&lowast ; ; Alex Donaghy ; BS&lowast ; ; Laura Phelps ; BS&lowast ; ; Kevin Blas ; MD&lowast ; ; Schuyler Halverson ; BS&lowast ; ; Robin Marsh ; CMD&lowast ; ; Karin Olson ; PhD&lowast ; ; Felix Y. Feng ; MD&lowast ; ; ffeng@med.umich.edu
- 刊名：International Journal of Radiation Oncology*Biology*Physics
- 出版年：2013
- 出版时间：1 April, 2013
- 年：2013
- 卷：85
- 期：5
- 页码：1246-1253
- 全文大小：391 K
Purpose
To assess the impacts of patient age and comorbid illness on rectal toxicity following external beam radiation therapy (EBRT) for prostate cancer and to assess the Qualitative Analysis of Normal Tissue Effects in the Clinic (QUANTEC) normal tissue complication probability (NTCP) model in this context.Methods and Materials
Rectal toxicity was analyzed in 718 men previously treated for prostate cancer with EBRT (¡Ý75 Gy). Comorbid illness was scored using the Charlson Comorbidity Index (CCMI), and the NTCP was evaluated with the QUANTEC model. The influence of clinical and treatment-related parameters on rectal toxicity was assessed by Kaplan-Meier and Cox proportional hazards models.
Results
The cumulative incidence of rectal toxicity grade ¡Ý2 was 9.5 % and 11.6 % at 3 and 5 years and 3.3 % and 3.9 % at 3 and 5 years for grade ¡Ý3 toxicity, respectively. Each year of age predicted an increasing relative risk of grade ¡Ý2 (P<.03; hazard ratio [HR], 1.04 [95 % confidence interval {CI}, 1.01-1.06]) and ¡Ý3 rectal toxicity (P<.0001; HR, 1.14 [95 % CI,1.07-1.22]). Increasing CCMI predicted rectal toxicity where a history of either myocardial infarction (MI) (P<.0001; HR, 5.1 [95 % CI, 1.9-13.7]) or congestive heart failure (CHF) (P<.0006; HR, 5.4 [95 % CI, 0.6-47.5]) predicted grade ¡Ý3 rectal toxicity, with lesser correlation with grade ¡Ý2 toxicity (P<.02 for MI, and P<.09 for CHF). An age comorbidity model to predict rectal toxicity was developed and confirmed in a validation cohort. The use of anticoagulants increased toxicity independent of age and comorbidity. NTCP was prognostic for grade ¡Ý3 (P=.015) but not grade ¡Ý2 (P=.49) toxicity. On multivariate analysis, age, MI, CHF, and an NTCP >20 % all correlated with late rectal toxicity.
Conclusions
Patient age and a history of MI or CHF significantly impact rectal toxicity following EBRT for the treatment of prostate cancer, even after controlling for NTCP.