Elan and Biogen Idec’s ongoing safety evaluation of TYSABRI has led to a previously diagnosed case of malignant astrocytoma being reassessed as progressive multifocal leukoencephalopathy (PML).
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Elan and Biogen Idec’s ongoing safety evaluation of TYSABRI has led to a previously diagnosed case of malignant astrocytoma being reassessed as progressive multifocal leukoencephalopathy (PML).