ANNOUNCER: Studies also show that many people with MS will also experience problems in how they think, especially without treatment.
FREDERICK MUNSCHAUER, MD: Cognitive difficulties, difficulty with memory, difficulty with problem-solving, difficulty multitasking occur frequently with MS. And about 50 percent of people, at ten to fifteen years into their illness, will be aware that they've just slowed down cognitively in some way.
ANNOUNCER: Within the last 10 to 15 years, researchers have developed a series of what are called "disease modifying drugs" that have been shown to alter the course of MS. Various clinical trials show clear benefit, including studies with drugs known as interferons.
HEIDI CRAYTON, MD: The phase III clinical trial data has shown us that we can decrease the progression of accumulated disability in two years with both of the interferon beta-1a products: Avonex and Rebif. Avonex decreased the rate of physical decline, accumulated physical disability, at two years by about 37 percent. Rebif, with the higher dose, showed that about 30 percent.
ANNOUNCER: Measuring decreases in physical decline can be a subjective task. Designers of these studies use benchmarks upon which doctors and their patients can easily agree.