title: RE: How many etiological subtypes of breast cancer: two, three, four, or more?
authors.affiliation: Clinical and Descriptive Epidemiology Unit, Institute for Study and Cancer Prevention, Florence, Italy (AC, EC). a.caldarella@ispo.toscana.it.
authors.forename: A
authors.initials: A
authors.lastname: Caldarella
authors.affiliation: Clinical and Descriptive Epidemiology Unit, Institute for Study and Cancer Prevention, Florence, Italy (AC, EC).
authors.forename: E
authors.initials: E
authors.lastname: Crocetti
mesh_terms: D014408:Biomarkers, Tumor / Q000235:genetics*; D001943:Breast Neoplasms / Q000145:classification* / Q000209:etiology*; D005260:Female; D006801:Humans; D009363:Neoplasm Proteins / Q000235:genetics*
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins