抑制素是一种焦磷酸盐样的糖蛋白二聚体，主要由性腺产生，其作用是抑制垂体产生卵泡刺激素。迄今已知抑制素存在于正常人体的睾丸、副睾、卵巢、胎盘、垂体、肾上腺、肾、骨髓和脊髓等组织内。应用其单克隆抗体检测性腺性索间质肿瘤时，阳性率高达８０ ％ ～１００ ％ ，因而有利于性腺性索间质肿瘤的病理诊断及鉴别诊断 Inhibin is a pyrophosphate-like glycoprotein dimer that is mainly produced by the gonad and its role is to inhibit the production of follicle stimulating hormone from the pituitary gland. Somatostatin has hitherto been known to exist in normal human testis, epididymis, ovary, placenta, pituitary gland, adrenal gland, kidney, bone marrow, and spinal cord. When using its monoclonal antibody to detect gonadal stromal tumors, the positive rate is as high as 80% to 100%, which is conducive to the pathological diagnosis and differential diagnosis of gonad sigmoid stromal tumors.