title: Does breast cancer originate in utero?
mesh_terms: D001943:Breast Neoplasms / Q000209:etiology*; D004967:Estrogens / Q000009:adverse effects*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011297:Prenatal Exposure Delayed Effects; D012307:Risk Factors; D014427:Twins; D014429:Twins, Dizygotic
chemical_list: D004967:Estrogens