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2015 ; 11
(ä): 1779-88
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Hypercalcemia of malignancy and new treatment options
#MMPMID26675713
Sternlicht H
; Glezerman IG
Ther Clin Risk Manag
2015[]; 11
(ä): 1779-88
PMID26675713
show ga
Hypercalcemia of malignancy affects up to one in five cancer patients during the
course of their disease. It is associated with both liquid malignancies, commonly
multiple myeloma, leukemia, and non-Hodgkins lymphoma and solid cancers,
particularly breast and renal carcinomas as well as squamous cell carcinomas of
any organ. The clinical manifestations of hypercalcemia are generally
constitutional in nature and not specific to the inciting malignancy. Such
physical manifestations can range from malaise to lethargy and confusion.
Constipation and anorexia are common. Acute kidney injury is likely the most
frequently encountered manifestation of end organ damage. Symptomatology is
closely linked to both the absolute elevation of serum calcium levels and the
rapidity of calcium rise. The majority of cases are humoral in etiology and
related to parathyroid hormone-related protein (PTHrP). Approximately 20% of
cases are the result of direct bone metastasis with extra-renal
1,25-dihydroxyvitamin D (calcitriol) and ectopic parathyroid hormone production
likely accounting for less than 1% of cases. The diagnosis of hypercalcemia of
malignancy is confirmed either by an elevated PTHrP or by an evidence of bone
metastasis in the appropriate clinical setting. Treatment is predicated on the
patient's symptoms and absolute serum calcium level. Interventions are aimed at
lowering the serum calcium concentration by inhibiting bone resorption and
increasing urinary calcium excretion, the former accomplished via bisphosphonate
therapy and the latter with aggressive hydration. Novel therapies for refractory
disease include denosumab, a monoclonal antibody against the receptor activator
of nuclear factor ?B ligand, and the calcimimetic cinacalcet. Finally, anti-PTHrP
antibodies have been successfully deployed in animal models of disease. Despite
the efficacy of the above therapies, hypercalcemia of malignancy portends an
ominous prognosis, indicating advanced and often refractory cancer with survival
on the order of months.