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Calcium and vitamin D metabolism in sarcoidosis
R P Baughman1, J Janovcik, M Ray
11Department of Internal Medicine, University of Cincinnati Medical Center, Cincinnati, OH, USA. bob.baughman@uc.edu
Background:
Sarcoidosis associated hypercalcemia (SAHC) may be secondary to excessive levels of 1,25-(OH)2 vitamin D3 produced by autonomous 1-alpha-hydroxylase activity within the granulomas. The frequency, treatment, and consequences of hypercalcemia remain unclear.
Study Design And Methods:
Two patient cohorts were studied. In Cohort 1, the prevalence of hypercalcemia in 1606 sarcoidosis patients seen during a six year period was analyzed along with treatment and outcome. Cohort 2 consisted of 261 sarcoidosis patients with measured 25-(OH) vitamin D3 and 1,25-(OH) vitamin D3 levels. In forty patients, serial levels of 25-(OH) vitamin D3 and 1,25-(OH) vitamin D3 were measured at least three months apart without change in therapy.
Results:
SAHC was identified in 97 of 1606 (6%) of patients studied and additional nine (0.6%) patients had primary hyperparathyroidism. Post treatment follow up was available in 86 SAHC patients. Hypercalcemia improved in >90% of patients, including eight patients treated solely with vitamin D supplement withdrawal. Renal insufficiency, documented in 41 (42%) of SAHC patients, improved with hypercalcemia treatment. In 80% of Cohort 2 patients low 25-(OH) vitamin D3 levels were measured with only one patient having a low 1,25(OH)2 vitamin D3 level. Elevated 1,25(OH)2 vitamin D3 levels, which were measured in 11% of patients, were higher for those with a history of hypercalcemia.
Conclusion:
Sarcoidosis associated hypercalcemia, which is often accompanied by renal insufficiency, responds to treatment of sarcoidosis and withdrawal of vitamin D supplementation. Measurement of serum vitamin 1,25(OH)2 vitamin D3 appears to best evaluate vitamin D status in sarcoidosis patients.
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