It is hypothesized that disordered calcium homeostatis in malignant and non-malignant lymphoproliferative disorders may result form the over production of active Vitamin D metabolites in immune cells. The ability of the chloroquine derivatives to inhibit extrarenal 1,25-(OH)2-D production in sarcoidosis, other granuloma-forming states and lymphoma is being assessed. Based upon the patients entered to date, it appears that 1,25-(OH)2-D levels drop significantly within days of treatment initiation.
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