title: Increased recovery of estrogen receptor in crude homogenates of breast cancer biopsies. A preliminary report.
abstract: Crude homogenates and cytosols of 31 breast cancer biopsies were analyzed for estrogen receptor, using the ER-EIA monoclonal assay (ABBOTT Laboratories). The recovery of the receptor was significantly higher in all homogenates than in their corresponding cytosols, in six of which the receptor was below the level of detection. The range of the ratio between homogenate and cytosol concentrations was 0.9-8.1 for 25 positive biopsies. If the recent hypothesis of nuclear localization of the receptor is accepted, the values obtained with crude homogenates would more correctly reflect the true concentration of the receptor in the cells.
mesh_terms: D001706:Biopsy; D001943:Breast Neoplasms / Q000032:analysis*; D003600:Cytosol / Q000032:analysis; D005260:Female; D006801:Humans; D011960:Receptors, Estrogen / Q000032:analysis*
chemical_list: D011960:Receptors, Estrogen