[Determination of plasma prolactin in patients with breast dysplasia].

Prolactin is determined by means of radioimmunoassay in the postovulatory phase of a group of women with mammary dysplasia. A specially increased concentration of prolactin is found in the proliferative dysplasias (multiple intraductal papillomatosis and invasive sclerosing adenosis), that may be considered as preneoplastic processes.