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Serum and tissue calcium in human breast carcinoma.

Calcium determinations with atomic absorption spectrophotometry were performed on serum and on malignant tissues obtained from patients with carcinoma of the breast. No correlation was noted between either serum calcium levels or tissue calcium levels and the number of positive axillary lymph nodes. The tumor calcium content was greater than that of the control tissue. This latter finding is in conflict with some earlier reports concerning tissue calcium content.