Abstract
Objective
To examine the antitumor activity of zoledronic acid (ZA) combined with androgen deprivation therapy (ADT) for men with treatment-naive prostate cancer and bone metastasis.
Methods
We enrolled 227 men with treatment-naive prostate cancer and bone metastasis. Participants were randomly assigned (1:1 ratio) to receive combined androgen blockade alone (CAB group) or ZA with combined androgen blockade (CZ group). Time to treatment failure (TTTF), time to the first skeletal-related event (TTfSRE), and overall survival (OS) rates were estimated using the Kaplan–Meier method. Hazard ratios (HRs) were calculated using the Cox proportional hazards model. Median follow-up duration was 41.5 months.
Results
Median TTTFs were 12.4 and 9.7 months for the CZ and CAB groups, respectively (HR 0.75; 95 % CI 0.57–1.00; p = 0.051). For men with baseline prostate-specific antigen levels <200 ng/mL, median TTTFs were 23.7 and 9.8 months for the CZ and CAB groups, respectively (HR 0.58; 95 % CI 0.35–0.93; p = 0.023). Median TTfSREs were 64.7 and 45.9 months for the CZ and CAB groups, respectively (HR 0.58; 95 % CI 0.38–0.88; p = 0.009). OS was similar between the groups.
Conclusions
This study failed to demonstrate that combined use of ZA and ADT significantly prolonged TTTF in men with treatment-naive prostate cancer and bone metastasis. However, it generates a new hypothesis that the combined therapy could delay the development of castration resistance in a subgroup of patients with low baseline prostate-specific antigen values <200 ng/mL. The treatment also significantly prolonged TTfSRE but did not affect OS.
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Acknowledgments
The ZAPCA trial was supported by Grant for Urologic Research No. 200040700148 from Kyoto University Hospital. We thank all members of the ZAPCA Study Group for their cooperation. We also thank Dr. Masanori Fukushima in TRI for his valuable advice and critical reading of the manuscript and Mr. Koichi Yamashiro in TRI for his administrative and clerical support of this study. The affiliated members are Hakodate Goryokaku Hospital, Sunagawa City Medical Center, Sapporo Medical University, Akita University, Osaki Citizen Hospital, Tohoku University, Kesen-numa City Hospital, Yamagata Prefectural Central Hospital, Mito Medical Center, Jikei University School of Medicine, Jikei University Katsushika Medical Center, Kitasato University, Tokai University, Shimada Municipal Hospital, Shizuoka General Hospital, Shizuoka Hospital, Otsu Red Cross Hospital, Otsu Municipal Hospital, Shiga Medical Center for Adults, Shiga University of Medical Science, Kyoto University, Kyoto-Katsura Hospital, Kyoto City Hospital, Nara Medical University, Yamato Koriyama Hospital, Tenri Hospital, Osaka Red Cross Hospital, Kansai Electric Power Hospital, Osaka Kaisei Hospital, Kitano Hospital, Nishikobe Medical Center, Toyo-oka Hospital, Kurashiki Central Hospital, Kure Medical Center, Hiroshima University, JA Hiroshima General Hospital, Chugoku Rosai Hospital, Kagawa University, Oita University, Tsurumi Hospital, Nakamura Hospital, Yamaga Hospital, Ureshino Medical Center, Nagasaki University, and University of Miyazaki.
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Tomomi Kamba accepted an honorarium from Astellas Pharma. Toshiyuki Kamoto accepted research funding and honoraria from Astellas Pharma. Fuminori Sato accepted research funding from Janssen Pharmaceutical and Astellas Pharma. Naoya Masumori accepted honoraria from Novartis Pharma and Daiichi Sankyo, and research funding from Daiichi Sankyo. Shin Egawa accepted research funding from Astellas Pharma and Takeda Pharmaceutical. Hideki Sakai accepted research funding from Astellas Pharma and Takeda Pharmaceutical, and honoraria from Astellas Pharma and AstraZeneca. Osamu Ogawa accepted an honorarium from Astellas Pharma.
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10147_2016_1037_MOESM1_ESM.tiff
Fig. S1. Kaplan−Meier plots for time to treatment failure in patients with baseline PSA ≥200 ng/mL (A), EOD ≤2 (B), EOD ≥3 (C), GS ≤7 (D) and GS ≥8 (E) (TIFF 5170 kb)
10147_2016_1037_MOESM2_ESM.tiff
Fig. S2. Kaplan−Meier plots for time to first SRE in patients with baseline PSA <200 ng/mL (A), PSA ≥200 ng/mL (B), EOD ≥3 (C) and GS ≤7 (D) (TIFF 4136 kb)
10147_2016_1037_MOESM3_ESM.tiff
Fig. S3. Kaplan–Meier plots for OS in patients with baseline PSA <200 ng/mL (A), PSA ≥200 ng/mL (B), EOD ≤2 (C), EOD ≥3 (D), GS ≤7 (E) and GS ≥8 (F) (TIFF 5596 kb)
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Kamba, T., Kamoto, T., Maruo, S. et al. A phase III multicenter, randomized, controlled study of combined androgen blockade with versus without zoledronic acid in prostate cancer patients with metastatic bone disease: results of the ZAPCA trial . Int J Clin Oncol 22, 166–173 (2017). https://doi.org/10.1007/s10147-016-1037-2
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DOI: https://doi.org/10.1007/s10147-016-1037-2