Interferons are a group of immune system proteins -- alpha, beta, and gamma -- produced by the body. They act in different ways to control the activity of the immune system. They also have antiviral properties. (Remember that another theory regarding relapses in people who already have MS is that they may be triggered by viruses.) So far, experts have found that interferon beta is effective in treating multiple sclerosis (MS).
A person with primary progressive multiple sclerosis (PPMS) may first seek medical care because of leg weakness or difficulty walking. Those are the most common symptoms of this type of MS.
PPMS steadily worsens after it first develops. Neurological disability will accumulate over time. How fast or to what degree disability develops varies for each person and can't be predicted. And in PPMS -- unlike some other types of MS -- there are no relapses or remissions.
Ten percent to 15% of people with...