Repoxygen was the tradename for a type of
gene therapy to produce
erythropoietin (EPO). It was under preclinical development by Oxford Biomedica as a possible treatment for
anaemia but was abandoned in 2003.
The project became infamous when it was mentioned during the criminal trial of Thomas Springstein, a former track coach for some German athletes, who was found guilty of giving athletes
performance enhancing drugs without their knowledge. An email in which Springstein attempted to obtain Repoxygen was read by a prosecutor, which led to a flurry of media coverage.
World Anti-Doping Agency banned "gene doping" in 2003
 and as of 2009 was researching detection methods for substances such as repoxygen.