Mammary tissue samples were collected from 32 healthy post menopausal women: 19 were using estrogen and progestagen on a cyclical schedule (conjugated estrogens, 0.625mg, for 21 days/month, associated to medroxyprogesterone acetate, 5mg, for the last 12 days) and 13 were using estrogen-only, on a 21 days/month schedule (conjugated estrogens, 0.625mg), all during 6 consecutive months. Biopsies were performed on the external left-hand upper quadrant before and after 6 months of treatment. Immunohystochemical analysis was performed with the antibodies: anti-PCNA of […]