Clinical Outcomes of Switching from Zoledronic Acid to Denosumab for the Management of Severe Bone Metastasis from Hepatocellular Carcinoma: A Single-Center, Open-Label, Prospective Intervention Trial

Background: Zoledronic acid reduces the risk of bone metastasis, but denosumab is a better option for treating bone metastases. However, few studies have evaluated the use of denosumab to treat bone metastasis originating from hepatocellular carcinoma. This study aimed to assess the clinical outcomes of switching from zoledronic acid to denosumab for treating bone metastasis in patients with hepatocellular carcinoma.

Methods: This prospective study enrolled 10 patients with HCC and bone metastases. The levels of type 1 collagen cross-linked N-telopeptide (NTx) and tumor growth remained abnormal in these patients despite administration of zoledronic acid for over 3 months. We switched from zoledronic acid to 120 mg denosumab every 4 weeks and evaluated the clinical outcomes, including changes in the NTx level, pain level, and activities of daily living, as well as adverse events, after each administration.

Results: Urinary NTx clearance was normal in all patients. The average urinary NTx clearance increased from 13.2 to 21.2 nmol BCE/nmol · Cre (P = 0.54) after the switch to denosumab. Serum NTx levels were abnormal in all cases. The serum NTx level decreased from 142 nmol BCE/L to 126 nmol BCE/L (P = 0.56). The answers to questionnaires on pain and activities of daily living did not change significantly. Some patients showed elevated transaminase levels, but this was not due to the drug switch.

Conclusion: Switching to denosumab did not show a significant change of the pain and activity of daily living for the patients with severe bone metastasis from hepatocellular carcinoma, in whom the efficacy of zoledronic acid was limited.