This study was to find out if patients with Relapsing Remitting Multiple Sclerosis treated with Interferon beta-1a had an improved quality of life after treatment with Interferon beta-1a

The study was an open-label, multi-center, international post-marketing study (phase 4). Eligible patients were interferon naïve patients suffering from relapsing MS. The duration of a subject's participation in the study was up to a maximum 26 months.

Inclusion Criteria:

• Relapsing Remitting Multiple Sclerosis
• Interferon naïve
• Eligible for interferon beta-1a (AVONEX®) therapy as per Summary of Product Characteristics:
• Subject has had relapsing MS for > 1 year
• Subject has had experienced 2 exacerbations in the last 2 years
• Subject had an EDSS [5] score of < 5.5
• Subject was ambulant

Exclusion Criteria:

• Diagnosis of MS defined as progressive
• History of any significant cardiac, hepatic, pulmonary, or renal disease; immune deficiency; or other medical conditions that would preclude therapy with interferon beta
• History of severe allergic or anaphylactic reactions or history of hypersensitivity to human albumin
• History of seizures within the 3 months prior to starting this study
• History of intolerance to acetaminophen (paracetamol), ibuprofen, naproxen or other NSAIDs, that would preclude use of at least one of these during the study
• History of intolerance to interferons
• Previous use of interferon beta
• Female subjects who were pregnant or breast-feeding
• For female subjects, unless postmenopausal or surgically sterile, unwillingness to practice effective contraception