{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Gross Cystic Disease fluid is a pathologic secretion from the breast composed of several glycoproteins, including a unique 15 kDa monomer protein, GCDFP-15. The cells within the body that produce GCDFP-15 appear to be restricted primarily to those with apocrine function such as breast cysts and in apocrine glands in the axilla, vulva, eyelid, and ear canal. According to literature, GCDFP-15 is a useful marker for breast cancer."}]}]}