Progestagen "potency" and breast cancer.
D001943:Breast Neoplasms / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D011374:Progesterone / Q000009:adverse effects*; D013810:Therapeutic Equivalency
D003276:Contraceptives, Oral; D011374:Progesterone