ARIANNA

Treatment tested

• Atorvastatin

Inclusion: 1. Patients with relapsing-remitting forms of Multiple Sclerosis (according to McDonald s criteria; 28) with disease duration > 3 months and - 5 years. 2. EDSS score between 1.0 and 5.5, inclusive. 3. Currently treated with, and tolerating, Interferon beta, and having received this treatment for more than 3 and less than 12 months. 4. Age between 18 and 50 years, inclusive. 5. Patients must agree to avoid macrolids, including erytromicine and claritromicine for the whole study duration. 6. A woman of child-bearing potential must agree to adapt the proper behaviour adequately to avoid pregnancy while on study. 7. Negative pregnancy test results at screening day (all women of childbearing potential only). 8. Consent to go on the diet (appendix 2). 9. Written informed consent. 10. Serum lipid profile, as defined in appendix 3. 11. Adequate bone marrow, renal, and hepatic function, as defined in appendix 4. Exclusion: 1. Any disease other than Multiple Sclerosis that would better explain the patient s signs and symptoms. 2. Primary progressive MS. 3. Secondary progressive MS. 4. Uncontrolled, clinically significant heart diseases, such as dysrhythmias, angina, or uncompensated congestive heart failure. 5. Previous confirmed venous thromboembolic disease including deep vein phlebitis and/or pulmonary embolism or known hemostatic disorder predisposing to thromboembolic complications. 6. Uncontrolled Seizure disorder. 7. Myopathy or clinically significant liver disease. 8. Medical or psychiatric conditions that compromise the ability to give informed consent, to comply with the protocol, or to complete the study. 9. Inability, in the opinion of the principal investigator or staff, to comply with protocol requirements for the duration of the study. 10. Well-known hypersensitivity to either Atorvastatin or Interferon β or other human proteins including albumin.11. Well-known hypersensitivity to gadolinium. 12. Inability to undergo a MRI scan. 13. A relapse started within 30 days prior to screening or between screening and baseline. 14. A history of substance abuse (hard and soft drugs, alcoholic drinks) in the 90 days prior to screening. 15. Previous (at any time ) therapy with any of the following: monoclonal antibodies, cytotoxic or immunosuppressive therapy (excluding systemic steroids and adrenocoticotropic hormone; ACTH), total lymphoid irradiation. 16. Previous therapy, administrated for ≥12 months, with other interferon beta drugs, Mitoxantrone, Azathioprine or Glatiramer acetate in the 12 months before start of the currently interferon beta treatment.. 17. Previous treatment (at any time) with statins. 18. Treatment with any of the following in the 30 days before baseline: systemic corticosteroids, ACTH, or other investigational drugs.

The primary endpoint of the study is the efficacy of Atorvastatin compared to placebo, in patients RRMS already in treatment with Interferon-beta, evaluating the disease activity measured by the changes in brain atrophy after 24 months of treatment.