At the forefront are rumors that cyclists are using a genetically engineered kidney-disease drug to enhance performances. Some physicians are concerned that the drug, which the body also produces naturally as a hormone, is somehow linked to the deaths, but research does not indicate that.
The drug, erythropoietin (EPO), can be used as a simple alternative to what is known as blood doping. EPO stimulates red-blood cells to increase their output of oxygen-carrying hemoglobin.
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Rob J. Pluijmers, a sportsmedicine doctor involved with Dutch cyclists for 15 years, admitted last week in Salt Lake City that he knows three professionals taking EPO, a recombinant hormone used to treat anemia. He refused to name the athletes, but this is the first official acknowledgement that athletes are using the drug.
Pluijmers, however, denied that any of the 15 deaths could be attributed to erythropoietin.
"There is no reason to think EPO use is involved," said Pluijmers who was visiting the United States to speak to colleagues at the American College of Sports Medicine.
Pluijmers said the cyclists he knows using the drug are from the Netherlands and Belgium. He said the three got the drug from sources in Belgium. One athlete, he said, was taking the drug to treat a medical problem, but the others were using it to enhance performance.
EPO is not yet registered in the Netherlands, although it is widely approved throughout Europe. The Food and Drug Administration approved its use in the United States last June. Amgen, a Thousand Oaks firm, developed the drug here.
Three years ago, physicians and pharmacologists stated their concerns about the abuse of erythropoietin among athletes such as cyclists and distance runners who would benefit from blood doping.
In October of 1989, Dr. Bjorn Ekblom of Stockholm's Institute of Gymnastics and Sport, reported that eight Swedish athletes increased their endurance by 10% after using erythropoietin during a study.
Ekblom, credited with discovering blood doping in 1972, said at the time: "This makes it hard to believe in sports' future."
Ekblom's skepticism is shared by many in the medical community who suspect widespread EPO abuse, although it may be years before they can prove it.
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Although doctors have no evidence of EPO use by U.S. athletes, the USOC's Puffer believes it is a problem.
"It is impossible to know, but I think it is one of our major concerns besides steroids," he said.
http://articles.latimes.com/1990-06-02/sports/sp-143_1_performance-enhancing-drug