The present invention relates to a novel compound (e.g., 24-ethyl- cholestane-3.beta.,5.alpha.,6.alpha.-triol), its production, its use, and to methods oftreating neoplasms and other tumors as well as other diseases includinghypercholesterolemia, autoimmune diseases, viral diseases (e.g., hepatitis B,hepatitis C, or HIV), and diabetes.