What is Interferon beta-1a?

Interferon beta-1a is a cytokine in the interferon family used to treat multiple sclerosis. It is produced by mammalian cells, while interferon beta-1b is produced in modified E. coli. Some research indicates that interferon injections may result in an 18–38% reduction in the rate of MS relapses.

Interferon beta has not been shown to slow the advance of disability. Interferons are not a cure for MS ; the claim is that interferons may slow the progress of the disease if started early and continued for the duration of the disease.