New breast cancer research: mothers and twins.
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D001943:Breast Neoplasms / Q000209:etiology / Q000235:genetics*; D004200:Diseases in Twins; D004777:Environment; D005260:Female; D006801:Humans; D008297:Male; D009035:Mothers; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012307:Risk Factors; D014429:Twins, Dizygotic / Q000235:genetics; D014430:Twins, Monozygotic / Q000235:genetics