 - Active disease despite prior treatment with corticosteroids for at least 2 weeks, or immunosuppressants for at least 3 months. Treatment with azathioprine, 6-MP or MTX is allowed but must have been on a stable dose for at least 10 weeks, corticosteroids are allowed but must have been on a stable doses of prednisolone not exceeding 40 mg for two weeks prior to baseline. Immunosuppressants other than those listed above, such as cyclosporine, tacrolimus and mycophenolate, are not allowed and must be stopped wash-out periods defined in the protocol; 