title: The role of androgens and polymorphisms in the androgen receptor in the epidemiology of breast cancer.
abstract: Testosterone binds to the androgen receptor in target tissue to mediate its effects. Variations in testosterone levels and androgen receptor activity may play a role in the etiology of breast cancer. Here, we review the epidemiologic evidence linking endogenous testosterone to breast cancer risk. Paradoxically, results from observational studies that have examined polymorphisms in the androgen receptor suggest that the low-activity androgen receptor increases breast cancer risk. We review the quality of this evidence and conclude with a discussion of how the androgen receptor and testosterone results coincide.
authors.affiliation: Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California, USA. osth@usc.edu
authors.forename: Elizabeth O
authors.initials: EO
authors.lastname: Lillie
authors.forename: Leslie
authors.initials: L
authors.lastname: Bernstein
authors.forename: Giske
authors.initials: G
authors.lastname: Ursin
mesh_terms: D000728:Androgens / Q000502:physiology*; D015982:Bias; D001943:Breast Neoplasms / Q000453:epidemiology*; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D011110:Polymorphism, Genetic / Q000502:physiology*; D011446:Prospective Studies; D011944:Receptors, Androgen / Q000502:physiology*; D013739:Testosterone / Q000378:metabolism
chemical_list: D000728:Androgens; D011944:Receptors, Androgen; D013739:Testosterone