
I downloaded the WADA PDF and one thing I noticed that was added to the list is Gene Doping defined as "... The non-therapeutic use of cells, genes, genetic elements, or of the modulation of gene expression, having the capacity to enhance athletic performance, is prohibited. ..."
If gene doping is on the list then some athlete or athletes are probably doing it. Most likely using a therapy called, Repoxygen™ by Oxford BioMedica. The Repoxygen™ process alters your body so as to create EPO and therefore combat anemia. It also delivers more oxygen to your heart: [Link]
Wiki article on Gene Doping: [Link]