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  • Title: High serum ALP level is associated with increased risk of denosumab-related hypocalcemia in patients with bone metastases from solid tumors.
    Author: Kinoshita Y, Arai M, Ito N, Takashi Y, Makita N, Nangaku M, Shinoda Y, Fukumoto S.
    Journal: Endocr J; 2016 May 31; 63(5):479-84. PubMed ID: 26860123.
    Abstract:
    Metastatic bone disease is one of the most common complications of advanced cancers. Pathological fractures, spinal cord compression, and radiotherapy or surgery to the bone are collectively called skeletal-related events (SREs), which cause severe pain, increase hospitalization rates, and impair the quality of life (QOL) of patients with bone metastases. The receptor activator of nuclear factor-kB ligand (RANKL)/RANK pathway is critical in the progression of bone metastases. Previous studies have demonstrated that an anti-RANKL antibody (denosumab) was superior to zoledronic acid in prolonging time to first SRE in patients with bone metastases from prostate and breast cancers. However, severe hypocalcemic events occur more frequently after treatment with denosumab compared with zoledronic acid. In this study, 368 administrations of denosumab in 219 patients with metastatic bone disease from solid tumors were analyzed to clarify the risk factors for developing hypocalcemia. The results showed that grade 2/3 hypocalcemia was observed in 10.4% of the total number of denosumab administrations. Patients with higher baseline serum ALP, higher performance status (PS), or gastric cancer were at higher risk for developing hypocalcemia. The cut-off value for ALP to predict denosumab-related hypocalcemia was 587 U/L with a sensitivity of 0.77 and a specificity of 0.81. Close monitoring of serum calcium, especially after the first treatment with denosumab, is strongly recommended in these patients.
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