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