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Posted by on Jul 23, 2008 in Ethics, Pharma, Supplements, Toxicology

Roche and WADA to Tour de France Athlete: Gotcha

Roche and WADA to Tour de France Athlete: Gotcha

Cycling_race.jpg

Italian cyclist and Tour de France competitor Riccardo Ricco was caught doping with Roche’s new erythropoiesis-stimulating agent (ESA) Mircera, according to numerous news reports today. An official of the World Anti-Doping Agency (WADA) reported to Bloomberg that use of the druga long-acting, pegylated version of epoetin betawas made detectable because of an implanted, traceable molecule within the product. A brief scan of relevant, online FDA documents suggests that the implanted molecule is a trade secret of Roche.

In June, Danish investigators indicated that the detection of older, shorter-acting ESAs, namely recombinant human erythropoietin (rHuEpo), in urine by WADA laboratories is highly unreliable. The official WADA method is to distinguish endogenous Epo from rHuEpo on the basis of molecular charge, a technique that has been criticized for generating a high number of false positives and negatives.

To assess the reliability of current rHuEpo testing by WADA labs, the Danish investigators injected 8 healthy, nonathlete, male university students with rHuEpo, by using a boosting (5000 IU qod x 14 d) and maintenance (q weekly x 2 weeks) program. Urine samples were submitted to 2 different WADA labs for testing, with the following results.

Phase

Laboratory A

Laboratory B

Boosting

All positive

None positive

Maintenance

6/16 positive; 2 suspect

5 suspect

Posttreatment

2/24 positive; 3 suspect

None positive

The investigators also found little correlation between suspect or positive results from the 2 WADA labs and suggest that the “only strategy which provides a possible chance for obtaining a positive urine Epo test” is to perform out-of-competition testing at more than 1 WADA lab during the suspect rHuEpo boosting period. Alternatively they suggest that efforts should be focused on reliable detection, such as that evidently facilitated by Roche for Mircera.

Photo: iStockPhoto

bmartin (1130 Posts)

A native East Tennessean, Barbara Martin is a formerly practicing, board-certified neurologist who received her BS (psychology, summa cum laude) and MD from Duke University before completing her postgraduate training (internship, residency, fellowship) at the Hospital of the University of Pennsylvania in Philadelphia. She has worked in academia, private practice, medical publishing, drug market research, and continuing medical education (CME). For the last 3 years, she has worked in a freelance capacity as a medical writer, analyst, and consultant. Follow Dr. Barbara Martin on and Twitter.