U.S FDA strengthens warnings on Glaxo, Roche/Biogen cancer drugs
Sept 25 (Reuters) - U.S. regulators strengthened the warning labels on two cancer drugs - GlaxoSmithKline Plc's Arzerra, and Rituxan, made by Biogen Idec Inc and Roche Holding AG - to reflect the risk that they can reactivate the hepatitis B virus in patients previously infected with it. T
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