Abstract
Purpose
This study evaluated the baseline patient characteristics associated with the time to biochemical progression and overall survival in patients who participated in a phase II trial on zoledronic acid combined with the initial androgen-deprivation therapy for treatment-naïve bone-metastatic prostate cancer.
Methods
Patients received zoledronic acid 4 mg intravenously every 4 weeks for up to 24 months, concomitantly started with bicalutamide 80 mg orally every day and goserelin acetate 10.8 mg subcutaneously every 12 weeks.
Results
A total of 53 Japanese patients were enrolled between July 2008 and April 2010, and 52 patients were evaluable. Median follow-up period was 41.6 months. Updated median time to biochemical progression was 25.9 months (95 % confidence interval 14.5–49.9). Higher serum bone-specific alkaline phosphatase was an independent risk factor for time to biochemical progression based on multivariate analysis (hazard ratio 6.51; 95 % confidence interval 2.71–15.62; P < 0.001). Median time to biochemical progression for patients with serum bone-specific alkaline phosphatase level higher than 26 μg/L was 12.7 months. Multivariate analysis indicated that higher serum C-terminal telopeptide of type I collagen independently increased the risk of death (hazard ratio 9.62; 95 % confidence interval 2.11–43.89; P = 0.003). Median overall survival for patients with serum C-terminal telopeptide of type I collagen level higher than 8.0 ng/ml was 31.1 months.
Conclusions
Baseline bone markers can be useful as predictors for disease progression and survival time in patients with bone metastasis from treatment-naïve prostate cancer treated with upfront zoledronic acid concomitantly started with androgen-deprivation therapy.
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Acknowledgments
The authors thank all patients and their families for participating in this study, all investigators and site staff for their contribution, and Marco De Velasco for reviewing the language.
Conflict of interest
The authors have no conflict of interest.
Ethical standard
The study was conducted according to the Declaration of Helsinki with approval from ethics committees at each institution. Written informed consent was obtained from all patients consistent with local requirements.
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Nozawa, M., Hara, I., Matsuyama, H. et al. Significance of baseline bone markers on disease progression and survival in hormone-sensitive prostate cancer with bone metastasis. World J Urol 33, 1263–1268 (2015). https://doi.org/10.1007/s00345-014-1431-1
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DOI: https://doi.org/10.1007/s00345-014-1431-1