Significantly associated with Betaferon treatment for patients with first event suggestive of MS, p < 0.05 * Significantly associated with Betaferon treatment for RRMS, p < 0.05 ° Significantly associated with Betaferon treatment for SPMS, p < 0.05 § Injection site reaction (various kinds) comprises all adverse events occurring at the injection site, i. e. the following terms: injection site hemorrhage, injection site hypersensitivity, injection site inflammation, injection site mass, injection site necrosis, injection site pain, injection site reaction, injection site edema, and injection site atrophy & “ Flu-like symptom complex ” denotes flu syndrome and/ or a combination of at least two AEs from fever, chills, myalgia, malaise, sweating. # During the third year of the BENEFIT study, no change of the known risk profile of Betaferon was observed.