Here in the US, Tysabri is only for "relapsing" forms of MS, which include RRMS, PRMS and SPMS with relapses. Furthermore, Tysabri can be used as First Line (as in needle phobic MS patients) and/or
Second Line, as indicated by Dr. Richard Katz of the FDA in a C/C. See the FDA statement: "Tysabri is a monoclonal antibody used to treat patients with relapsing forms of multiple sclerosis (MS) to reduce the frequency of exacerbations (flare-ups). Tysabri is indicated for... patients who have not responded adequately to, or cannot tolerate, other treatments for MS."
See Tysabri Label: "TYSABRI® is indicated as monotherapy for the treatment of patients with relapsing forms of multiple sclerosis to delay the accumulation of physical disability and reduce the frequency of clinical exacerbations." http://www.biogenidec.com/site/TYSABRI-PI-MedGuide.pdf
You can also argue that you have a highly active/aggressive form of RRMS
to the Swedish infusion center!
Best wishes Martin, and again - Welcome!