title: Estrogen receptor variations in neoplastic tissue during the course of disease in patients with recurrent breast cancer.
mesh_terms: D001706:Biopsy; D001943:Breast Neoplasms / Q000188:drug therapy / Q000503:physiopathology* / Q000628:therapy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D009364:Neoplasm Recurrence, Local; D011379:Prognosis; D011960:Receptors, Estrogen / Q000032:analysis / Q000502:physiology*
chemical_list: D011960:Receptors, Estrogen