The humoral hypercalcemia of benignancy. A newly appreciated syndrome

American Journal of Clinical Pathology
T P KnechtLeonard J Deftos

Abstract

It has become recently appreciated that the hypercalcemia of malignancy is commonly caused by the increased production of parathyroid hormone-related protein (PTHrP) by the cancer. In fact, the demonstration of increased PTHrP production in a patient with hypercalcemia is regarded as pathognomonic of malignancy. The authors describe a patient with a benign ovarian lesion that produced PTHrP and caused hypercalcemia. They identify other reports of hypercalcemia associated with hypercalcemia and benign tumors, and refer to this syndrome as the humoral hypercalcemia of benignancy. Although apparently rare, a benign PTHrP-producing tumor should be considered in the differential diagnosis of hypercalcemia.

Citations

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