GH1 and neoplasm: A number of predictive factors, which might have interfered with the hormonal remission rate from a statistical, clinical and paraclinical point of view, were identified: tumor size (r = 0.625), preoperative GH serum levels (r = -0.517), cavernous sinus extension was quantified according to Knosp grading score (r = 0.469) and the degree of tumor subtotal resection (r = 0.598).