Steroids are a general term for a large class of cyclopental fused hydrogenated phenanthrene derivatives widely distributed in the biological world. Also known as steroids, steroids. Steroid compounds are free of bound fatty acids and are non-saponifying lipids; such compounds are classified as isoprenoids and are formed by tricyclic cyclization followed by intramolecular recombination and chemical modification.
Steroids include sterols (such as cholesterol, lanosterol, sitosterol, sterol, ergosterol), bile acids and bile alcohols, steroid hormones (such as adrenocortical hormones, androgens, estrogens), insect ecdysone, Cardiac glycosides and saponin ligands and scorpion venom.
In addition, there are synthetic steroid drugs such as anti-inflammatory agents (prednisolone, dexamethasone), steroid drugs that promote protein synthesis, and oral contraceptives.
Anabolic steroids are similar to synthetic male sex hormones. They are a class of chemically synthesized derivatives similar in structure and activity to the human androgen testosterone.
On October 27, 2017, the World Health Organization's International Agency for Research on Cancer published a preliminary list of carcinogens, and androgen (anabolic) steroids in the list of Class 2A carcinogens.