title: Quality control of estrogen receptor assays.
abstract: Four types of material have been used for the quality control of routine assays of estrogen receptors in human breast tumors. Pieces of hormone-dependent Nb rat mammary tumors gave a precision about 40%. Rat uteri and rat tumors pulverized at liquid nitrogen temperature and stored as powder yielded precision about 30%. Powdered and lyophilised human tumors appear the best with precision as good as 17%.
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000032:analysis; D003600:Cytosol; D005260:Female; D006801:Humans; D011309:Preservation, Biological; D011786:Quality Control; D051381:Rats; D011960:Receptors, Estrogen; D014599:Uterus
chemical_list: D011960:Receptors, Estrogen