Management of hypercalcemia in relation to pathophysiology

J P Bonjour¹, R Rizzoli, S Hirschel-Scholz

¹Department of Medicine, University Hospital, Geneva, Switzerland.

|January 1, 1987

Summary

Hypercalcemia of malignancy (HM) involves calcium imbalance. Treatment targets elevated bone resorption or tubular reabsorption, with specific agents like clodronate or WR-2721 depending on the primary mechanism.

Area of Science:

Endocrinology
Nephrology
Oncology

Background:

Hypercalcemia arises from disturbed calcium (Ca) balance, involving intestinal absorption, skeletal resorption, and renal excretion.
Calciotropic hormones and cytokines can disrupt Ca fluxes, leading to excess calcium in the extracellular space.
Hypercalcemia of malignancy (HM) often involves increased bone resorption, but enhanced tubular reabsorption can also be a key factor.

Purpose of the Study:

To investigate the mechanisms of calcium imbalance in hypercalcemia of malignancy.
To evaluate therapeutic strategies targeting specific calcium flux abnormalities.
To identify optimal treatments based on whether bone resorption or tubular reabsorption is the predominant issue.

Main Methods:

Analysis of calcium (Ca) fluxes at intestinal, skeletal, and renal tubular sites.
Evaluation of the efficacy of clodronate, an antiresorbing agent, in normalizing bone resorption.
Assessment of the role of tubular calcium reabsorption (TRCa) and potential inhibition by agents like WR-2721.

Main Results:

Increased net bone resorption (BR) is common in HM.
In some HM patients, sustained high tubular calcium reabsorption (TRCa) contributes significantly, even after saline correction.
Clodronate effectively normalizes BR but may be insufficient when high TRCa is the primary driver.

Conclusions:

Clodronate is the preferred treatment for HM with elevated BR and normal TRCa.
When increased TRCa is the main mechanism, clodronate should be combined with other agents.
WR-2721 shows potential for rapidly lowering plasma calcium in HM with high TRCa.

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