title: [Neoadyuvant endocrine therapy in breast cancer].
abstract: Neoadjuvant chemotherapy is an accepted strategy for patients with locally advanced breast cáncer. This approach increases the possibilities of conservative treatment and improves the resectability rates of initially unresectable tumors. In addition, preoperative systemic therapy allows the evaluation of prognostic and predictive factors, dynamically and in vivo. Since over 80% of these tumors express estrogen receptors (ER), endocrine therapy seems a logical treatment to employ in the neoadjuvant setting. The advent of new drugs that regúlate the ER function, along with the results of several clinical studies with the use of neoadjuvant endocrine therapy, support the feasibility and safety of utilizing this strategy before surgery. We herein analyze the available clinical evidence about the use of neoadjuvant therapy aiming to regúlate the activity of the ER. We also discuss the valué of predictive factors that could help the oncologist to select those patients most likely to benefit from this approach and the role of endocrine therapy as a research instrument.
authors.affiliation: Oncología Médica, Departamento de Hematología-Oncología, Facultad de Medicina, Pontificia Universidad Católica de Chile. Santiago, Santiago, Chile.
authors.forename: Francisco
authors.initials: F
authors.lastname: Acevedo
authors.forename: María Elisa
authors.initials: ME
authors.lastname: Herrera
authors.forename: Jorge
authors.initials: J
authors.lastname: Madrid
authors.forename: César
authors.initials: C
authors.lastname: Sánchez
mesh_terms: D018931:Antineoplastic Agents, Hormonal / Q000008:administration & dosage*; D014408:Biomarkers, Tumor / Q000097:blood; D001943:Breast Neoplasms / Q000097:blood / Q000737:chemistry / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D020360:Neoadjuvant Therapy; D011960:Receptors, Estrogen / Q000378:metabolism; D011980:Receptors, Progesterone / Q000378:metabolism
chemical_list: D018931:Antineoplastic Agents, Hormonal; D014408:Biomarkers, Tumor; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone