title: Breast cancer prevention trial will recruit 16,000 women.
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000188:drug therapy / Q000517:prevention & control*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008875:Middle Aged; D016032:Randomized Controlled Trials as Topic; D012307:Risk Factors; D013629:Tamoxifen / Q000009:adverse effects / Q000627:therapeutic use*
chemical_list: D013629:Tamoxifen