estradiol and progesterone receptors ( er and pr ) were studied in 46 breast fibroadenomas obtained at different periods of the menstrual cycle ( n = 38 ) or from patients under combined estrogen-progestagen contraceptive ( n = 4 ) or substitutive progestagen treatment for progesterone insufficiency ( n = 4 ) .
C0033308
progesterone
C0033306
progestagen