We had to assess who else might be at risk.

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We concluded that at this particular time there is no evidence that there are more PML cases.

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We have found no evidence of additional cases of PML.

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Statistically then, the risk is approximately 1 in 1,000, which is substantially higher than in the normal population. We're also careful to say we do not know what the risk is for individuals with long-term use of the drug.

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Even under close evaluation, PML remains a rare disease. But as we alter the immune system, we need to understand what unintended effects it might have.

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