IFNB1 and relapsing-remitting multiple sclerosis: RRMS is the most common form of MS and affects up to 85% of the infected population.2 There is no cure for MS, but immunomodulatory therapies, including different formulations of interferon beta (IFNβ), glatiramer acetate (GA), mitoxantrone and natalizumab (anti-very late-4 (VLA-4 antibody) are available, of which interferon has been the best prescribed (Table 1).2, 5, 6