There have been two studies on Tecfidera, known as DEFINE and CONFIRM. In these studies, Tecfidera reduced MS relapse rates by ~50% (over placebo), and reduced the progression of disability by ~30%. [Sidebar: I so hate the word "progression" when used in this way]. If you're keeping score at home, the "Big Four" MS drugs (Copaxone, Rebif, Avonex, and Betaseron) all reduce relapse rates by around 35%. A fifth common drug, Tysabri, cuts relapse rates by ~65%.
That was the extent of my counting in Spanish, btw. Multilingual I am not!