Quoted from http://health.usnews.com/health-news/family-health/digestive-disorders/articles/2010/05/05/anemia-drugs-hold-dangers-for-kidney-patients.html
Anemia Drugs Hold Dangers for Kidney Patients
Study finds increased risks for potential deadly complications
By Ed Edelson
WEDNESDAY, May 5 (HealthDay News) -- The powerful drugs used to fight anemia caused by kidney failure increase the risk for cardiovascular problems such as heart attack, a major study has found.A meta-analysis of 27 trials, which included more than 10,000 people who were given the drugs, known as erythropoiesis-stimulating agents (ESAs), found that those who took the drugs at the highest dosages had a 51 percent increased risk for stroke and a 33 percent increased risk for thrombosis, or blockage of an artery. The study, by an international group of experts, was published online May 3 in Annals of Internal Medicine.
The increased risk for death (9 percent) and serious cardiovascular events such as heart attacks (15 percent) did not reach statistical significance, the analysis found.
The U.S. Food and Drug Administration has acted to control the use of ESAs marketed as Epogen, Procrit and Aranesp, which stimulate production of red blood cells to treat the anemia caused by kidney failure and cancer chemotherapy. The agency has added a "black box" warning of dangers to ESA labeling.
The new study adds emphasis to such moves, said Dr. Ajay K. Singh, an associate professor of medicine at Harvard Medical School and a nephrologist at Brigham and Women's Hospital in Boston.
"This meta-analysis shows increased risk with no benefit," Singh said. "The supposed benefit is that ESAs improve quality of life and make people feel better. This study suggests that these drugs, used at considerable cost, don't show any benefit in terms of those endpoints."