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  • Title: Esterase activity in human breast cyst fluid: associations with steroid sulfates and cations.
    Author: Levitz M, Raju U, Katz J, Finlay TH, Brind JL, Arcuri F, Castagnetta L.
    Journal: Steroids; 1992 Oct; 57(10):485-7. PubMed ID: 1333653.
    Abstract:
    Human breast cyst fluid (BCF) contains an esterase that on the basis of electrophoretic mobility and response to inhibitors differs from those found in the plasma. From a total of 384 BCF samples analyzed for esterase using p-nitrophenyl hexanoate as substrate, 149 (39%) showed significant activity. The samples had been analyzed for the concentrations of the sulfates of estrone, estriol, dehydroepiandrosterone, as well as the potassium and sodium cations (K+/Na+). The data were submitted to statistical analysis using the Spearman rank order test. The esterase-positive samples exhibited a significant positive association with each of the steroid sulfates and the K+/Na+ ratios. Except for protein concentration, there was no significant correlation between the esterase-positive and esterase-negative cysts. These observations may have physiological significance in that high K+/Na+ ratio cysts have been related to the histological status of the cyst.
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