Rheumatoid arthritis (RA) is a progressive, systemic autoimmune disease characterized by inflammation of the lining of the joint (synovial membrane). This inflammation causes pain, stiffness and swelling. More disturbing is that, over a short period of time, the inflammation leads to irreversible joint destruction and disability. RA affects more than 21 million people worldwide with approximately 2.5 million people affected in the United States.
RA also shortens life expectancy by affecting major internal organ systems. Studies have shown that after 10 years, fewer than 50% of patients can continue to work or function normally on a day- to-day basis.
A study presented this past week at EULAR 2007, the Annual European Congress of Rheumatology in Barcelona, Spain reported the results of the first phase III trial of a new RA drug, tocilizumab, which will be marketed as Actemra in the United States.
Tocilizumab is a novel humanized anti human interleukin 6 (IL-6) receptor monoclonal antibody. Monoclonal antibodies are proteins that are produced to have the same structure and properties. In this case, the proteins have all been grown to block the effects of IL-6 by binding to a specific part of the antibody called the receptor. By doing this, the effects of IL-6, which are to promote inflammation, are eliminated. IL-6 is a cytokine involved in the pathogenesis of RA and by targeted blockage of this receptor, tocilizumab slows down the progression of rheumatoid arthritis.
The study involved 623 patients with sustained moderate to severe RA despite long standing treatment with methotrexate. Patients received 4mg/kg, 8mg/kg tocilizumab or placebo intravenously every four weeks for a period of 24 weeks. Patients were allowed concurrent treatment with methotrexate at their pre-study dose (10-25mg weekly). Treatment with all other disease modifying anti-rheumatic drugs (DMARDs) was discontinued at the beginning of the trial.
Significant improvement in symptoms was observed in all patients receiving tocilizumab and methotrexate compared to placebo and methotrexate.
Nearly half (43.9%) of rheumatoid arthritis (RA) patients receiving tocilizumab 8mg/kg, in addition to ongoing methotrexate therapy experienced a 50% improvement in symptoms at 24 weeks and more than one fifth achieved a 70% symptom improvement. These numbers are very impressive and compare favorably with the effects reported in the clinical trials of drugs such as Enbrel, Humira, and Remicade, which are drugs that are already in use in the U.S.
Adverse Events (AEs) were recorded throughout the duration of the trial with a similar AE profile reported in all three groups (8mg/kg, 4mg/kg and placebo). The AE profile of tocilizumab is consistent with data presented in previous studies with the treatment being generally well tolerated.
The results of this study will undoubtedly advance the probability that the drug will be approved by the FDA for use in the United States.
Rheumatoid Arthritis New Treatment
With the advent of biologic therapies, specifically tumor necrosis inhibitors (anti-TNF drugs), it is now possible to get the disease into complete remission. And, it is not out of the realm of possibility that if treated early enough and aggressively enough, some patients with RA can actually be cured.
We know from multiple studies that early aggressive treatment of rheumatoid arthritis is associated with improved disease control, slower x-ray progression and improved functional outcomes.
Tumor necrosis factor blocking therapy is effective but there remain concerns in some circles about long-term risks.
Combining disease-modifying antirheumatic drugs (DMARDs) is a widely used therapeutic alternative; however, there is uncertainty surrounding the most effective regimen. Advocates claim a fairly impressive response rate.
I confess I am not a fan of combination DMARD therapy because I feel that the risks of doing this are greater than the risks of anti-TNF drugs. Also, my experiences using combinations has not been as positive as the results touted in the literature; however, there are still many rheumatologists who use this approach so I will try to explain it.
A popular combination is methotrexate plus sulfasalazine (Azulfidine), but each of these DMARDs can also be used in combination with other DMARDs and in triple drug therapy programs as well. However, due to a number of factors, it is difficult to come to firm conclusions regarding what is the best approach.
Rheumatologists who use combination DMARD therapy claim it is well tolerated and associated with no significant increase in the rate of sides effects compared with monotherapy (using one drug alone). Combinations that have been used include: methotrexate-sulfasalazine, methotrexate-hydroxychloroquine (Plaquenil), methotrexate- cyclosporine (Sandimmune), methotrexate-leflunomide (Arava), methotrexate-intramuscular-gold and methotrexate-doxycycline.
It is felt by some practitioners that triple DMARD therapy is better than DMARD monotherapy or using two DMARDS. Some advocates say that the combination of methotrexate with hydroxychloroquine has synergistic anti-inflammatory properties.
Among rheumatologists who tout the use of combination DMARDS, various approaches are used. These include: a step-up (addition of new DMARDs to an existing treatment), a step-down (initial use of multiple DMARDs with subsequent withdrawal once remission is achieved) or a parallel approach (simultaneous use of two or more DMARDs).
To date though, there is no consensus regarding either the most effective strategy, or the combination of DMARDs for the treatment of RA. Most rheumatologists who do use combinations though feel that any combination should use methotrexate and that combinations not using methotrexate are not as effective.
So... what's a mother to do?
There still is uncertainty regarding the long term use of anti-TNF drugs. No question about it. However, there is some new interesting information that supports their use in regards to lessening of both lymphoma risk as well as cardiovascular risk is patients with RA.
Nathan Wei has sinced written about articles on various topics from Arthritis Pain, Health and Arthritis Signs. Nathan Wei MD FACP FACR is a rheumatologist and Director of the Arthritis and Osteoporosis Center of Maryland. He is a Clinical Assistant Professor of Medicine at the University of Maryland School of Medicine.For more info:. Nathan Wei's top article generates over 550000 views. to your Favourites.
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