Reports from National Arthritis Meeting 2003
Of Interest on Rheumatoid Arthritis from
Rheumatoid arthritis (RA) is an autoimmune disease that can cause chronic inflammation of the joints and other areas of the body. Rheumatoid arthritis can affect persons of all ages. Its cause is unknown. Rheumatoid arthritis is a chronic disease that is characterized by periods of disease flares and remissions. In RA, multiple joints are usually, but not always, affected in a symmetrical pattern (affecting both sides of the body). The chronic inflammation of RA can cause permanent joint destruction and deformity. The "rheumatoid factor" is an antibody blood test that can be found in 80 percent of patients with RA.
Rheumatoid arthritis is a common rheumatic disease, affecting more than two million people in the United States. The disease is three times more common in women than in men. It afflicts people of all races equally. The disease can begin at any age, but most often starts after age forty and before sixty. In some families, multiple members can be affected, suggesting a genetic basis for the disorder.
There is no known cure for RA. The treatment of RA optimally involves a combination of patient education, rest and exercise, joint protection, medications, and occasionally, surgery. Currently, doctors feel that the earlier patients with RA receive aggressive treatment, the better their long-term outcome.
Below are perspectives on key reports presented at the recent national meeting of the American College of Rheumatology:
Remicade (infliximab) is an antibody that blocks the effects of tumor necrosis factor alpha (TNF-alpha). TNF-alpha is a substance made by cells of the body that has an important role in promoting inflammation. TNF promotes the inflammation and its associated fever and signs (pain, tenderness, and swelling) in several inflammatory conditions, including rheumatoid arthritis. By blocking the action of TNF-alpha, infliximab reduces the signs and symptoms of inflammation and stops the progression of joint damage. Remicade is used to treat rheumatoid arthritis, Crohn's disease, and other serious forms of inflammation such as uveitis, psoriatic arthritis, and ankylosing spondylitis. Remicade is given by intravenous infusion over approximately 2 hours, usually every 4-8 weeks.
British researchers found that Remicade infusions could be safely administered at faster rates after the first 4 infusions if no reactions were noted in the first infusions. They also noted that stopping and restarting Remicade as a treatment did not result in any increase in toxicity.
Dr. Shiel's Perspective: Exciting news for patients already using Remicade. It appears that they may not require the usual 2 hour rate of infusion after taking 4 doses of Remicade without side effects. Theoretically, Remicade might have the potential to cause sensitization. So that if Remicade were stopped and restarted at a much later date, there could be an increased chance of allergic reaction. However according to this research, if, for whatever reason, Remicade treatment is interrupted, resumption of the drug at a later time does not come with an increased chance for an infusion reaction!
Researchers from the United Kingdom reported that patients whose rheumatoid arthritis is not controlled with Remicade can respond successfully to Enbrel.
Dr. Shiel's Perspective: Well, this is very interesting. Since both Remicade and Enbrel block TNF as a key method of action, one might expect that switching from one drug to the other might not be effective. Wrong. The researchers point out that the reason for the benefit from switching might be related to the fact that they do differ slightly in their targets (Remicade binds to both a soluble form of TNF-alpha and to TNF-alpha bound to membranes of cells, while Enbrel binds to soluble TNF-alpha and to another chemical messenger lymphotoxin-alpha). Big words! They simply mean that if one fails on one TNF-blocking drug, it is rational to try another.