Abstract
Purpose
Prostate cancer remains a common disease that is frequently treated with multimodal therapy. The goal of this study was to assess the impact of treatment of the primary tumor on survival in men who go onto receive chemotherapy for prostate cancer.
Methods
Using surveillance, epidemiology and end results (SEER)-Medicare data from 1992 to 2009, we identified a cohort of 1614 men who received chemotherapy for prostate cancer. Primary outcomes were prostate cancer-specific mortality (PCSM) and all-cause mortality (ACM). We compared survival among men who had previously undergone radical prostatectomy (RP), radiation therapy (RT), or neither of these therapies. Propensity score adjusted Cox proportional hazard models and weighted Kaplan–Meier curves were used to assess survival.
Results
Compared to men who received no local treatment, PCSM was lower for men who received RP ± RT (HR 0.65, p < 0.01) and for those who received RT only (HR 0.79, p < 0.05). Patients receiving neither RP nor RT demonstrated higher PCSM and ACM than those receiving treatment in a weighted time-to-event analysis. Men who received RP + RT had longer mean time from diagnosis to initiation of chemotherapy (100.7 ± 47.7 months) than men with no local treatment (48.8 ± 35.0 months, p < 0.05).
Conclusion
In patients who go on to receive chemotherapy, treatment of the primary tumor for prostate cancer appears to confer a survival advantage over those who do not receive primary treatment. These data suggest continued importance for local treatment of prostate cancer, even in patients at high risk of failing local therapy.
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Acknowledgments
The interpretation and reporting of these data are the sole responsibility of the authors. The authors acknowledge the efforts of the Applied Research Program, NCI; the Office of Research, Development and Information, CMS; Information Management Services (IMS), Inc.; and the Surveillance, Epidemiology, and End Results (SEER) Program tumor registries in the creation of the SEER-Medicare database.
Authors’ contribution
J. Zabell was involved in project development and manuscript writing. O. Adejoro participated in project development, data management, data analysis, and manuscript editing. S. Jarosek was involved in data analysis and manuscript editing. S. P. Elliott contributed to project development and manuscript editing. B. R. Konety was involved in project development and manuscript writing/editing.
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The collection of this data was performed under and IRB-approved protocol. Retrospective analysis was performed using de-identified data.
Conflict of interest
The authors declare no directly relevant conflicts of interest, but all potential conflicts and associations are listed below. Authors J Zabell, O Adejoro, and S Jarosek declare no conflict of interest. Drs. Elliott and Konety have no directly relevant conflicts of interest, but do have the following financial relationships. Dr. Elliott is a consultant/advisor for AMS, GT Urological, Percuvision, Auxilium. Dr. Konety is a consultant/advisor for Photocure, Inc., Axogen, Inc., Dendreon, and has been involved in scientific trial for Dendreon, Myriad Genetics.
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Zabell, J.R., Adejoro, O., Jarosek, S.L. et al. Impact of initial local therapy on survival in men later receiving chemotherapy for prostate cancer: a population-based, propensity-weighted multivariable analysis. World J Urol 34, 1397–1403 (2016). https://doi.org/10.1007/s00345-016-1790-x
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DOI: https://doi.org/10.1007/s00345-016-1790-x