Humoral hypercalcemia of malignancy(HHM)を呈した骨転移陰性の進行乳癌の1例

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  • REPORT OF A CASE OF ADVANCED BREAST CANCER WITH NO BONE METASTASIS COMPLICATED BY HUMORAL HYPERCALCEMIA OF MALIGNANCY

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A case of advanced breast cancer with no bone metastasis complicated by humoral hypercalcemia of malignancy was reported. The patient was a 46-year-old woman who complained of general fatigue, anorexia and vomiting during chemotherapy consisting of docetaxel and cyclophosphamide for liver and lung metastases from breast cancer. The laboratory data showed a remarkable incrcase in serum calcium (9.7mEq/l) and PTHrP (555pmol/l) without elevation of PTH (13pg/l). Bone scintigraphy, Xray and CT revealed no bone metastases. The lumbar vertebra bone density fell 77%-92%. Based on these findings, the diagnosis was humoral hypercalcemia of malignancy complicated by advanced breast cancer with no bone metastases.<br> Serum calcium was well controlled for a long time by antihypercalcemic therapy consisting of intravenous saline, incadronate, corticosteroid and calcitonin accompanied by chemotherapy with epirubicin.<br> Even if bone metastases are not evident in breast cancer patients, the clinician should keep in mind the possibility of humoral hypercalcemia of malignancy.

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