The correlation between annular treatment margins and biochemical failure in prostate brachytherapy patients with optimized intraprostatic dosimetry
| Autor: | Nathan Bittner, Kent E. Wallner, Zachariah A. Allen, Ashley Adamovich, Brittany White, Wayne M. Butler, Gregory S. Merrick |
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| Rok vydání: | 2011 |
| Předmět: |
Male
medicine.medical_specialty medicine.medical_treatment Brachytherapy Population Disease-Free Survival Androgen deprivation therapy Prostate cancer Prostate Humans Medicine Dosimetry Radiology Nuclear Medicine and imaging education Aged education.field_of_study business.industry Prostatic Neoplasms Radiotherapy Dosage Middle Aged Prostate-Specific Antigen Prognosis medicine.disease Surgery Prostate-specific antigen medicine.anatomical_structure Oncology business Nuclear medicine Prostate brachytherapy |
| Zdroj: | Brachytherapy. 10:409-415 |
| ISSN: | 1538-4721 |
| DOI: | 10.1016/j.brachy.2010.10.004 |
| Popis: | Purpose To determine whether periprostatic treatment margins correlate with biochemical control in prostate brachytherapy patients with optimized intraprostatic dosimetry. Methods and Materials Nineteen biochemically failed brachytherapy patients were matched to 74 dosimetric and clinically equivalent nonfailures. The median followup time for the entire study population was 9.4 years. Eligibility requirements included a Day 0 intraprostatic D 90 of 100% or greater and V 100 of 90% or greater, absence of androgen deprivation therapy, and no evidence of distant metastasis in biochemically failed patients. A 5-mm annulus was constructed around the perimeter of each prostate. D 90 and V 100 at the anterior, posterior, superior, inferior, right lateral, and left lateral aspects of the annulus were evaluated for patients with biochemically controlled and failed disease. Biochemical progression-free survival (bPFS) was defined as a prostate-specific antigen level of 0.40 ng/mL or less after nadir. D 90 and V 100 parameters were compared between the controlled and failed groups using logistic regression. Predictors of biochemical failure were identified using Cox regression. Results No statistically significant differences in prostate-specific antigen level, Gleason score, percent positive biopsies, or intraprostatic dosimetry were observed between the controlled and failed patients. The D 90 and V 100 at the anterior, posterior, superior, inferior, right lateral, and left lateral aspects of the annulus were not statistically different between biochemically controlled and failed groups. Conclusion In this study, there was no relationship observed between annular dosimetry and biochemical control. It is unlikely that further radial dose intensification would have altered treatment outcome in this population of patients with optimized intraprostatic dosimetry. |
| Databáze: | OpenAIRE |
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