title: Primary synchronous bilateral breast cancer: epidemiological approach.
abstract: Twenty-eight (1.69%) cases of primary synchronous bilateral breast cancer (PSBC) out of 1,654 new cases were studied. PSBC compared with unilateral cases had a significantly higher (p less than 0.001) first degree family history of breast cancer; high frequency of subareolar location; no predominance of lobular and non-invasive types; no significantly different percentage of pathological stage I presentation. As there is no complete agreement on what constitutes a PSBC, studies should be carried out to formulate a more precise definition of this entity.
authors.affiliation: Center for Epidemiological Research, Argentine National Academy of Medicine, Buenos Aires.
authors.forename: J
authors.initials: J
authors.lastname: Kelmendi de Ustarán
authors.forename: R P
authors.initials: RP
authors.lastname: Meiss
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000473:pathology; D005260:Female; D006801:Humans; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary