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  • Title: Clinical evaluation of calcium metabolism in adult T-cell leukemia/lymphoma.
    Author: Fukumoto S, Matsumoto T, Ikeda K, Yamashita T, Watanabe T, Yamaguchi K, Kiyokawa T, Takatsuki K, Shibuya N, Ogata E.
    Journal: Arch Intern Med; 1988 Apr; 148(4):921-5. PubMed ID: 2895617.
    Abstract:
    To clarify the mechanism of development of hypercalcemia in adult T-cell leukemia/lymphoma (ATLL), ten patients with a serum creatinine level less than 177 mumol/L (2 mg/dL) were examined. Although hypercalcemia was seen in only four (40%) of these patients, four of six normocalcemic patients showed hypercalciuria (greater than 5 mmol/d [greater than 200 mg/24 h]). All hypercalcemic patients exhibited high nephrogenous cyclic adenosine monophosphate (NcAMP) levels in the face of low-normal immunoreactive parathyroid hormone and reduced serum 1,25-dihydroxyvitamin D [1,25(OH)2D] concentration. Half of the hypercalciuric patients with normocalcemia also showed high NcAMP and reduced serum 1,25(OH)2D levels. Furthermore, the changes in NcAMP and serum 1,25(OH)2D concentration closely paralleled the development of hypercalcemia and hypercalciuria in two patients. These results are reminiscent of the syndrome of humoral hypercalcemia of malignancy and suggest that derangements in calcium metabolism develop by a similar mechanism in patients with ATLL. The present data also indicate the importance of the measurement of urinary calcium excretion for early detection and prevention of fatal hypercalcemia in patients with ATLL.
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