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Published on: March 29, 2019
Prostatic Urethral Length on MRI Potentially Predicts Late Genitourinary Toxicity After Prostate Cancer Radiation
Joseph Lee1, Sirisha Nandalur1, Allison Hazy1
1Department of Radiation Oncology, Corewell Health William Beaumont University Hospital, Royal Oak, Michigan (J.L., S.N., A.H., H.Y., D.K., T.Q., K.M.); Medical School, Oakland University William Beaumont School of Medicine, Rochester, Michigan (J.L., S.N., A.H., S.A.K., K.K., H.Y., N.K., A.D., D.K., T.Q., K.R.N.).
Longer prostatic urethral length on pre-treatment prostate MRI predicts higher risk of late genitourinary toxicity after radiation therapy for prostate cancer, aiding in quality of life predictions.
Area of Science:
- Urology
- Oncology
- Radiology
Background:
- Genitourinary (GU) toxicity is a common side effect of prostate cancer radiotherapy (RT).
- Predicting GU toxicity risk is crucial for managing patient quality of life.
Purpose of the Study:
- To evaluate if pretreatment quantitative magnetic resonance imaging (MRI) measurements and clinical characteristics can predict GU toxicity after prostate cancer RT.
Main Methods:
- Retrospective cohort study of 361 prostate cancer patients.
- Analyzed pretreatment MRI measurements (urethra, prostate, bladder) and clinical data.
- Assessed GU toxicity using CTCAE v4.0, with logistic and Cox regression models.
Main Results:
- Brachytherapy was associated with increased acute GU toxicity.
- Longer urethral length (MUL) was linked to decreased acute GU toxicity.
- Longer prostatic urethral length independently predicted increased risk of late GU toxicity, particularly urinary frequency/urgency.
Conclusions:
- Pretreatment prostatic urethral length on MRI is a significant predictor of late GU toxicity after prostate RT.
- This metric can potentially improve risk-stratification models for post-RT quality of life.
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