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- W2897665263 abstract "Abstract Background Zoledronic acid (ZA), a potent bisphosphonate used for treatment of bone metastasis, has high bone affinity. This post hoc analysis evaluated the effects of long-term treatment and reduction in dosing frequency of ZA on bone saturation. Materials and Methods Pharmacokinetic data from three independent studies, OPTIMIZE-2 (patients receiving ≥9 doses of bisphosphonates) and two phase I studies, CZOL4460503 and CZOL4460506 (patients who were bisphosphonate naïve/bisphosphonate free for ≥1 year after previous dosing), were pooled. Serial urine and plasma samples were used as surrogate markers to determine ZA plasma area under the curve (AUC) over 6 hours (AUC0–6h) and dose excreted in urine over 6 hours (urine0–6h). Potential relationships between the number of years for which patients had been treated previously at time of study entry and AUC0–6h or urine0–6h were analyzed graphically. Results Creatinine clearances for patients were similar across the three studies and at all time points analyzed. The levels of AUC0–6h ZA in plasma at week 0 in every (q) 4 and q12 weekly arms of OPTIMIZE-2 were 0.366 h × mg/L and 0.397 h × mg/L compared with 0.345 h × mg/L and 0.356 h × mg/L in CZOL4460503 and CZOL4460506, respectively. In OPTIMIZE-2, the AUC0–6h ZA plasma levels were the same (0.428 h × mg/L) at week 36 in both q4 and q12 arms. The levels of ZA urine0–6h at week 36 in OPTIMIZE-2 (q4 and q12 week arms), CZOL4460503, and CZOL4460506 were 36.6%, 30.8%, 26.5%, and 27.3%, respectively. Conclusion Long-term ZA treatment may not impact bone saturation, and ZA dosing frequency does not seem to influence drug retention rates. Implications for Practice Zoledronic acid (ZA), used along with standard antineoplastic therapy to treat bone metastases associated with solid tumors and multiple myeloma, requires frequent (every 3–4 or every 12 weeks) long-term administration. This may result in bone saturation and subsequently lead to a higher risk of adverse events such as osteonecrosis of the jaw and atypical fractures. This post hoc analysis used surrogate markers to demonstrate that prolonged ZA administration does not cause bone saturation. Furthermore, reduction in ZA dosing frequency does not affect its retention level in bones over time. These findings will help in addressing clinicians' concerns regarding prolonged ZA administration." @default.
- W2897665263 created "2018-10-26" @default.
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- W2897665263 date "2018-10-08" @default.
- W2897665263 modified "2023-10-14" @default.
- W2897665263 title "Indirect Evaluation of Bone Saturation with Zoledronic Acid After Long‐Term Dosing" @default.
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- W2897665263 doi "https://doi.org/10.1634/theoncologist.2018-0218" @default.
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