<unk>  is the postulated practice of enhancing athletic performance through various beneficial effects of<unk> <unk> s injected into the bloodstream or otherwise introduced into the body. Currently there are no documented cases of<unk> , but there are suspicions that the practice may already be emerging.
Stem cell doping
Experimental cancer treatment
Drug pollution
Cancer immunoprevention
Thalidomide scandal
Radiation-induced cancer
Hazardous drugs
Ionizing radiation