Test Details: Immunohistochemical testing helps to identify specific antigens (proteins) within tissue sections utilizing an antigen-specific antibody. Inhibin, alpha is expressed in sex-cord stromal tumours, including Sertoli cell tumours, Leydig cell tumours, adrenocortical tumours, placental and gestational trophoblastic lesions, granular cell tumours of gallbladder and extrahepatic bile ducts.