NEW YORK – Conventional disease-modifying antirheumatic drugs will not be included among acceptable treatments for enthesitis related to psoriatic arthritis, according to a draft of guidelines being prepared for publication.
"The only controlled trial with a DMARD [disease-modifying antirheumatic drug] for enthesitis was conducted with sulfasalazine, and it was negative," said Dr. Evan L. Siegel, who is in group practice in rheumatology in Rockville, Md. Dr. Siegel led a group of experts preparing psoriatic arthritis enthesitis treatment recommendations to be issued by the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA).
In a preliminary report on the planned treatment recommendations, which were delivered at the joint meetings of GRAPPA and the Spondyloarthritis Research & Treatment Network (SPARTAN), Dr. Siegel reported that the new recommendations will recognize only two gradations of enthesitis: mild or moderate/severe.
"It is difficult to differentiate moderate from severe because these have not been treated as distinct entities in the clinical trials," Dr. Siegel said. Patients experience severity in regard to intensity of pain and limitation of function, either or both of which may represent severe enthesitis in any given individual patient, according to Dr. Siegel, who also noted that the number of sites of activity is also generally unhelpful.
"Significant activity at a single site may be sufficient to produce a major functional deficit in one individual, whereas the activity at multiple sites may not produce much symptomatology or functional loss in another," Dr. Siegel said.
Enthesitis, an inflammation at the site where tendons or ligaments attach to bone, has been reported in up to 70% of patients with psoriatic arthritis. In some patients, it is the dominant symptom. However, the number of treatment trials in which control of enthesitis is the primary outcome continues to be limited, according to Dr. Siegel. He acknowledged that many of the proposed treatment recommendations owed more to expert opinion than to data.
This is true of the proposed first-line recommendation, he said, which is the use of nonsteroidal anti-inflammatory drugs and physical therapy. For NSAIDs, the wording of the recommendation will emphasize the need to monitor side effects.
The expert opinion of the GRAPPA consensus group was nearly unanimous that NSAIDs and physical therapy are effective and should be tried initially in both mild and moderate/severe disease, even though Dr. Siegel said that the supportive data from controlled trials are limited.
For those with moderate/severe enthesitis not sufficiently controlled on NSAIDs, alternatives include tumor necrosis factor inhibitors, ustekinumab, and apremilast. Some supportive data are available for each of these options, even though the consensus group concluded that there is not enough comparative evidence "to recommend one over another," he said.
Rather, the consensus group is recommending that the choice of therapies beyond NSAIDs and physical therapy be individualized in relationship to comorbidities, personal preference, and other considerations.
Special wording is being developed in regard to the use of corticosteroid injections. This wording was partly inspired by a meta-analysis that associated corticosteroid injections with an adverse effect on the integrity of tendons. Although there were many criticisms of this report, there was sufficient concern among the consensus group to urge that this treatment be used with caution.
"We think that these injections should only be provided by experienced physicians," Dr. Siegel reported. The wording in the preliminary draft is that adjunctive corticosteroid injections "may be considered on an individual basis."
When published, the enthesitis guidelines will include grading for the quality of the evidence behind each recommendation as well as the relative strength of the recommendation conferred by the expert panel.
Dr. Siegel reported financial relationships with Amgen and AbbVie.