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Theralizumab (TGN1412, CD28-SuperMAB, and TAB08) is an immunomodulatory drug developed by Thomas Hünig of the University of Würzburg. It was withdrawn from development after inducing severe inflammatory reactions as well as chronic organ failure in the first-in-human study by PAREXEL in London in March 2006.The developing company, TeGenero Immuno Therapeutics, went bankrupt later that year. The commercial rights were then acquired by a Russian startup, TheraMAB.The drug was renamed TAB08. Phase I and II clinical trials have been completed for arthritis and clinical trials have been initiated for cancer.

Originally intended for the treatment of B cell chronic lymphocytic leukemia (B-CLL) and rheumatoid arthritis,TGN1412 is a humanised monoclonal antibody that not only binds to, but is a strong agonist for, the CD28 receptor of the immune system's T cells.

Theralizumab which was designated as an orphan medical product by the European Medicines Agency in March 2005, was developed by TeGenero Immuno Therapeutics, tested by Parexel and manufactured by Boehringer Ingelheim.TeGenero announced the first elucidation of the molecular structure of CD28 almost exactly one year prior to commencement of the TGN1412 phase I clinical trial.