Evaluate Efficacy and Safety of Fingolimod 0.5 mg Orally Once Daily Versus Placebo in Chronic Inflammatory Demyelinating Polyradiculoneuropathy Patients.

Inclusion Criteria * written informed consent must be obtained before any assessment is performed * The diagnosis of CIDP will use the definition of the EFNS/PNS Task Force First Revision. Patients must either have a clinical diagnosis of CIDP fulfilling the clinical inclusion criteria for typical CIDP or one of the following atypical forms of CIDP: pure motor, or asymmetrical (MADSAM \[Lewis-Sumner syndrome\]), or IgA or IgG (not IgM) MGUS paraprotein associated. * All patients must also fulfill the clinical exclusion criteria and the definite electrodiagnostic criteria of the EFNS/PNS Task Force First Revision. * disability defined by an INCAT Disability Scale score of 1-9 or, if INCAT score is 0, a documented history of disability sufficient to require treatment within the past 2 years following reduction or interruption of CIDP treatment * receiving IVIg treatment (minimal dose equivalent to 0.4 g/kg every 4 weeks for a minimum of 12 weeks) or corticosteroids (minimal dose equivalent to prednisone 10 mg/day) treatment prior to the screening visit * history of documented clinically meaningful deterioration confirmed by clinical examination during therapy or upon interruption or reduction of therapy within 18 months prior to Screening * stable CIDP symptoms for the 6 weeks before randomization Exclusion Criteria * other chronic demyelinating neuropathies, including: Distal Acquired Demyelinating Symmetric Neuropathy (DADS) Multifocal Motor Neuropathy (MMN) pure sensory CIDP hematopoietic malignancy except for MGUS * conditions in which the pathogenesis of the neuropathy may be different from CIDP such as: Lyme disease, POEMS syndrome, osteosclerotic myeloma, Castleman's disease * treatment with plasma exchange within 2 months of randomization, immunosuppressive/chemotherapeutic medications: azathioprine, cyclophosphamide, cyclosporine, mycophenolate, etanercept, methotrexate tacrolimus or other immunosuppressive drugs within 6 months of randomization or 5 half-lives (whichever is later), Rituximab in the 2 years prior to randomization (patients that have received rituximab between 1 and 2 years should have B-cell levels within normal range), other cytotoxic immunosuppressive medications with sustained effects (including mitoxantrone, alemtuzumab, cladribine) at any time, hematopoietic stem cell transplantation at any time