High IGF1 and GH (nadir in OGTT—oral glucose tolerance test) levels at diagnosis were detected in 11 cases, with a mean value of 3.47 ± 1.56 (×ULN—upper normal limit), where 3 cases had hyperprolactinemia and 2 cases presented with mixed PRL- and GH-secretion. The gene discussed is GH1; the disease is hyperprolactinemia.