Intravenousimmunoglobulin (IVIg) for the Treatment of Inflammatory Myopathies

Overview

Inflammatory myopathies are a group of muscle diseases characterized by muscle weakness, high levels of muscle enzymes in the blood, and inflammation of the tissue surrounding muscle fibers (endomysium). The diseases making up the inflammatory myopathies are grouped into three subsets: I) Polymyositis (PM) II) Dermatomyositis (DM) III) Inclusion Body Myositis (IBM) Inflammatory myopathies are thought to be autoimmune processes and are treated with steroids and immunosuppressive drugs. However, many patients who initially respond to these treatments develop resistance to the therapy or experience side effects causing the treatments to be stopped. Researchers believe that intravenous immunoglobulin (IVIg) may provide patients with PM, DM, and IBM a safer and more effective alternative to standard therapies for the diseases. IVIg is a drug that has been used successfully to treat other immune-related diseases of the nervous system. The study will take 60 patients and divide them into two groups. Group one will receive 2 injections of IVIg once a month for three months. Group two will receive 2 injections of placebo "inactive injection of sterile water" once a month for three months. Following the three months of treatment, group one will begin taking the placebo and group two will begin taking IVIg for an additional 3 months. The drug will be considered effective if patients receiving it experience a significant improvement (\>15%) in muscle strength.

The inflammatory myopathies are a group of acquired muscle diseases characterized by subacute onset of progressive proximal muscle weakness, elevated serum muscle enzymes and endomysial inflammation. They comprise 3 clinically distinct subsets: polymyositis (PM), dermatomyositis (DM) and Inclusion Body Myositis (IBM). Because immune-mediated mechanisms are primarily responsible for the clinical manifestations of these conditions, the treatment of choice is with corticosteroids or immunotherapy drugs. Although most of the patients initially respond to these drugs, a number of them become resistant or develop unacceptable side effects that necessitate their discontinuation. The need for a more effective and safe immunotherapy in patients with PM, DM or IBM prompted the present study using high dose intravenous immunoglobulin (IVIg). IVIg is an immunomodulating agent which has been shown to be effective and safe in the treatment of a number of patients with immune-related neuromuscular diseases. This is a double-blind, randomized, placebo-controlled study involving 30 patients, who will receive IVIg or placebo for 3 months and then will cross-over to the alternate therapy for another period of 3 monthly infusions. The monthly dose of IVIg is 2 GM/Kg divided into two daily doses. The drug will be considered effective if patients experience an increase of more than 15% in their baseline muscle strength. Muscle strength will be assessed with a series of objective dynamometric measurements performed before and at the end of each monthly infusion.