The general use of synthetic estrogens like DC pointed out that near many skilled collateral effects, some others that are showing with a decrease of bile excretion (cholestasis), reversible with their administration interruption; with hepatic cells adenoma that are potentially premalignant and can transform into hepatocellular carcinoma; with vascular complications such as (most frequently in carcinomatousis) "hepatic peliosis" and "thrombosis" of suprahepatic veins (Budd-Chiari's syndrome). There is no overall increase in the incidence of gallbladder disease (cholelithiasis and cholecystitis).