In the postoperative period, the patient’s serum GH was 40.343 ng/mL and serum IGF-1 was 1142 ng/mL; in the postoperative period, the patient’s serum GH was 59.360 ng/mL and serum IGF-1 was 1123 ng/mL; These findings suggest that the patient has residual pituitary tumor tissue and has not achieved biochemical remission. Here, IGF1 is linked to pituitary tumor.