Barts-MS PML Risk Guide ver. 3

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New PML risk guide

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Barts-MS PML Risk Guide ver. 3

  1. 1. Yes No Risk factor Prior history of JC virus infection, as indicated by the presence of JCV antibodies. Almost half of the general UK population are infected with JC virus in childhood and adolescence. It is unknown how you catch the virus, but you excrete it in your urine and we think it is found in the tonsils. The JC virus test will detect if you have anti-JC virus antibodies, meaning you have been infected with the virus at some point. Risk factor Previous treatment with immunosuppressive (IS) drugs. These are drugs that reduce the activity of your body’s immune system. Risk factor Your risk increases with a higher index. This is the level of antibodies in your blood. What is your risk of developing PML? Prior use of IS Less than 0.9 Between 0.9-1.5 More than 1.5 JCV Negative What is your JC virus status? Have you previously taken immunosuppressives? Negative Yes No Positive Starthere Do you know your index? PML risk over time No index 1 in 10000 1 in 1667 1 in 500 1 in 250 1 in 200 1 in 167 1 in 5000 1 in 1111 1 in 333 1 in 143 1 in 125 1 in 100 1 in 10000 1 in 3333 1 in 1250 1 in 500 1 in 500 1 in 333 1 in 10000 1 in 10000 1 in 5000 1 in 2500 1 in 2000 1 in 1667 1 in 3333 1 in 2500 1 in 250 1 in 125 1 in 125 1 in 167 1 in 10000 1 in 10000 1 in 10000 1 in 10000 1 in 10000 1 in 10000 1-12 13-24 25-36 37-48 49-60 60+ 1-12 months 13-24 months 25-36 months 37-48 months 49-60 months 60+ months 1:10000 Levelofrisk 1:100 Months on Tysabri Months on Tysabri

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