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Experts Define RA Remission Criteria - Signal New Therapeutic Era

  [ 10 votes ]   [ Discuss This Article ]
www.ProHealth.com • February 3, 2011


“As we have moved into a time of new treatment strategies for rheumatoid arthritis, remission has become an increasingly attainable goal.”

The American College of Rheumatology reports it will be employing two new provisional definitions of rheumatoid arthritis remission in future RA clinical trials.

As a result of research to be reported in the March issue of Arthritis & Rheumatism,(1) a person with RA who is enrolled in a clinical trial would need to meet one of the following definitions to be considered in remission:

1. Tender joint count, swollen joint count (on 28 joint counts), C-reactive protein (in mg/dl), and patient global assessment scores (on a scale of zero to 10) are all less than or equal to one.

2. Simplified Disease Activity Index (which adds the scores from the four outcome measures above plus a physician global assessment to create one number between zero and about 100) score is less than or equal to 3.3.

According to the investigators, RA disease activity is generally characterized by joint swelling and tenderness and is also reflected by increased blood levels of C-reactive protein, which is a laboratory measure of inflammation.

In addition, assessments by the patient and the health professional examining the patient also reflect the extent of disease activity.

These measures, among others, have been thoroughly reviewed by the investigators of this study and helped them arrive at the above provisional definitions. These definitions are in line with the RA treatment goal of reversing disease activity to prevent future damage.

More simplistically, once someone has essentially no signs and symptoms of the disease, he or she would be considered in remission and should benefit from maximal reduction in physical disability and no progression of joint damage.

The ACR and the European League Against Rheumatism, together with the Outcome Measures in Rheumatology Initiative, jointly convened a committee to create a definition of RA remission that could be used by rheumatologists involved in clinical trials.

“As we have moved into a time of new treatment strategies for rheumatoid arthritis, remission has become an increasingly attainable goal,” says David T. Felson, MD, an investigator in the study based at Boston University.

[Note: For examples of the burgeoning international focus on new treatment strategies, visit www.ClinicalTrials.gov, or see: “Arthritis Breakthrough: Drug combo may produce remission in newly-developed RA & very early arthritic disease,” as reported at the Nov 2010 ACR meeting in Atlanta, and “Vitamin D deficiency confirmed as common across a range of rheumatic conditions," as reported by the European League Against Rheumatism in June 2010.]

“However,” Dr. Felson adds, “there has been no widely-used definition of remission that is stringent, but achievable, and that could be applied uniformly as an outcome measure in clinical trials.

"Understanding this disconnect between treatment advances and the current definition of remission - which was created in 1981 by the ACR - led our committee to focus on redefining remission so RA researchers could begin to test new definitions to see if they hold up in clinical trials.”

At the beginning of its research, the committee agreed that remission had to meet a definition of little, if any, disease activity. Looking at the ACR’s core set of disease activity measures in RA (including tender joint count, swollen joint count, patient's assessment of pain, patient's and physician's global assessments of disease activity, patient's assessment of physical function, and laboratory evaluation of C-reactive protein), each committee member was surveyed to determine what the highest cut-off point for each of these should be for a person to be considered in remission.

The results of this survey led to a group of candidate definitions of remission, and each of these definitions was tested against the others and compared to the outcomes of existing RA trials.

“We identified a list of situations that might indicate someone is in remission. Then, we took each one of these candidate definitions of remission and examined how useful they would have been if used in existing RA trials,” says Maarten Boers, MD, PhD, MSc; another investigator in the study.

“Essentially, we wanted to know if a candidate definition of remission would have added value to, and successfully predicted a good outcome in, RA clinical trials.”

For a good outcome, the committee not only focused on whether a candidate definition of remission would offer clinical proof that joint damage had been halted, but also focused on functional outcomes of remission – namely, whether a patient could accomplish daily activities optimally.

“We asked six patient experts to participate in this research, as we know remission is both about the observational proof that a person is feeling and functioning better and the subsequent radiographic proof that the disease has been stopped altogether,” explains study investigator Josef Smolen, MD. “By involving patient experts and respective tests, we have successfully married these two concepts together in the preliminary definitions. Do the physical exams and lab tests indicate remission; does the patient’s assessment indicate remission? These are two very important questions, and both play a role in the redefinition of RA remission.”

After reviewing how each candidate definition would work in existing RA trials, and determining how a patient’s assessment of overall health and pain levels would play a role in remission definitions, the committee determined that - at any point in time - an RA patient must satisfy one of the two preliminary definitions to be considered in remission.

“In a trial, one of these definitions should be chosen in advance and then if a patient in the trial meets it, he or she would be considered in remission,” explains Dr. Felson.

“Our next steps will be to evaluate how useful and accurate these definitions are when incorporated into clinical practice,” he says. “As in trials, remission has become a reasonable goal for patients undergoing treatment in practice too.”

RA – Affects More Than Joints

Rheumatoid arthritis is a chronic disease that causes pain, stiffness, swelling, and limitation in the motion and function of multiple joints. Though joints are the principal body parts affected by RA, inflammation can develop in the organs as well. An estimated 1.3 million Americans have RA, and the disease typically affects women twice as often as men.

___

1. “American College of Rheumatology/European League Against Rheumatism provisional definition of remission in rheumatoid arthritis for clinical trials,” Arthritis & Rheumatism, Mar 2011, David T Felson, et al.

Source: American College of Rheumatology news release, Feb 3, 2011




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