IFNB1 and myeloid sarcoma: To chart the vitamin E levels and their relationship to disease activity in Norwegian MS patients, we have measured alpha-tocopherol in serum samples from 88 relapsing-remitting MS (RRMS) patients who participated in a randomised placebo-controlled trial of supplementation with omega-3 fatty acids or placebo in RRMS patients before and during treatment with IFNB (the OFAMS study) [11].