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A purified gamma immunoglobulin (IgG) with immunosuppressive activity. Obtained from rabbits that have been immunized with human thymocytes, antithymocyte globulin specifically recognizes and destroys T lymphocytes. Although the exact mechanism of action is not completely understood, it appears to involve T lymphocyte clearance from the circulation and modulation of T lymphocyte activity. Administering antithymocyte globulin with chemotherapy prior to stem cell transplantation may reduce the risk of graft-versus-host disease. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C278\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C278\' NCI Thesaurus)
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