title: Oral contraceptive use and estrogen receptor-negative breast cancer.
authors.affiliation: Hacettepe University Institute of Oncology, Department of Medical Oncology, Ankara, Turkey.
authors.forename: Sercan
authors.initials: S
authors.lastname: Aksoy
authors.forename: Omer
authors.initials: O
authors.lastname: Dizdar
authors.forename: Kadri
authors.initials: K
authors.lastname: Altundag
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000097:blood; D001943:Breast Neoplasms / Q000097:blood / Q000188:drug therapy*; D003276:Contraceptives, Oral / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011960:Receptors, Estrogen / Q000097:blood*; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor; D003276:Contraceptives, Oral; D011960:Receptors, Estrogen