Tumorigenic aspects.

This report presents a review of tumors, except those of pituitary, that have been reported to occur in women taking combined oral contraceptive preparations. Pathologic features, both gross and microscopic, and differential diagnosis are emphasized. Particular attention is given to tumors of the liver: focal nodular hyperplasia (hepatic hamartoma) and liver cell adenoma (benign hepatoma). The characteristic features of these usually distinctive lesions are illustrated, and an attempt is made to evaluate the significance of each with respect to oral contraceptives. Tumorigenic aspects relating to the uterus and the breast are briefly discussed.