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Hypercalcemia in Breast Cancer: An Echo of Bone Mobilization During Lactation?

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Abstract

Hypercalcemia is a frequent complication of breast cancer which causes significant morbidity and mortality. Most commonly, it occurs in patients with multiple skeletal metastases. However, in a significant minority of patients, calcium levels become elevated in the absence of skeletal disease. In both instances, hypercalcemia is the result of pathological bone resorption caused by the secretion of cytokines that stimulate osteoclast differentiation and activity. One of these cytokines is parathyroid hormone-related protein (PTHrP). PTHrP is also secreted by normal breast cells during lactation to increase bone resorption and liberate skeletal calcium stores for the purposes of milk production. Therefore, the pathophysiology of hypercalcemia in breast cancer patients mimics the physiological processes that normally regulate calcium metabolism during lactation. Current therapy for hypercalcemia in breast cancer patients relies on the inhibition of bone resorption by a class of drugs known as bisphophonates. Newer therapies in development target cytokines involved in the recruitment and activation of osteoclasts by tumor cells.

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Correspondence to John Wysolmerski.

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DeMauro, S., Wysolmerski, J. Hypercalcemia in Breast Cancer: An Echo of Bone Mobilization During Lactation?. J Mammary Gland Biol Neoplasia 10, 157–167 (2005). https://doi.org/10.1007/s10911-005-5398-9

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  • DOI: https://doi.org/10.1007/s10911-005-5398-9

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