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The U.S. FDA has announced that it is investigating whether four drugs used to treat rheumatoid arthritis and other immune system diseases might increase the risk of cancer in children.
The FDA has received reports of 30 cases of cancer among children and young adults treated with the drugs. The agency did not make clear how many children had taken the drugs.
The drugs involved are Enbrel, which is sold by Amgen and Wyeth, Remicade, which is sold by Johnson & Johnson and Schering-Plough, Humira, which is sold by Abbott Laboratories, and Cimzia, which is sold by the Belgian company UBC.
All of the drugs block a protein called tumor necrosis factor, and are therefore known as TNF-blockers.
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