[New findings on human prolactin].

Since prolactin (HPRL) occurs as a separate pituitary hormone in man the paper will discuss results about the mechanisms involved regulation of HPRL secretion. A number of factors which lead to an increase in HPRL secretion are named. The clinical relevance of HPRL inhibiting substances as L-DOPA and 2-Br-alpha-ergocryptine is mentioned. The influence of HPRL in pregnancy and lactation period is described also the regulative effect of HPRL on hormone-dependent breast tumors.