NEW YORK – A consensus group has developed evidence-based treatment recommendations for patients with psoriatic arthritis and nail involvement and raised the possibility of issuing them independent of recommendations for the skin, according to a report on the deliberations.
"The suggestion has been made to separate out skin from nail because the assessment is quite different to the point where you can potentially have patients with severe nail disease but limited skin disease," reported Dr. April W. Armstrong, director of the psoriasis program at the University of Colorado, Denver.
Dr. April W. Armstrong
The proposal was made in the course of presenting the preliminary evidence-based recommendations on managing psoriatic arthritis (PsA) nail involvement to the full membership of the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis. GRAPPA is in the process of preparing a new set of PsA treatment recommendations.
The decision to address nails separately from skin was not a unanimous recommendation within the committee, and no conclusion was reached, but Dr. Armstrong brought the issue forward "to be clear about our ambiguity" regarding this specific aspect of how to best outline treatment options useful to clinicians.
Other recommendations, based on evidence, are more assured of making the final version, because they are evidence based. When presented at GRAPPA, which convened its most recent annual meeting jointly with the Spondyloarthritis Research & Treatment Network, each recommendation was graded for the quality of the evidence and strength of the consensus.
For example, the committee found little controlled evidence to support a significant benefit from topical therapies, including those commonly used, such as steroids and vitamin D analogs. Although the consensus committee concluded that the risk of adverse events is low and the costs are low to moderate, the efficacy is only modest. The strength for recommending topical therapies overall was characterized as "weak."
For procedural therapies, such as pulsed-dye laser or intralesional injections, no placebo-controlled trials could be identified by the committee, and the expert opinion of its members was that the efficacy is relatively low in general even if benefit is achieved in some individuals. The cost was characterized as low to moderate. The committee concluded that only a "weak" recommendation should be conferred to these types of interventions for nail involvement.
The proposed recommendation for oral therapies, such a methotrexate, cyclosporine, leflunomide, and acitretin, was considered "stronger than that for topical therapies" when nail involvement is moderate, but the committee also found supportive evidence of benefit to be of "low quality." Again, although recognizing that some PsA patients may benefit, the recommendation for oral therapies overall for nail involvement was characterized as weak.
For biologics, including both tumor necrosis factor (TNF) inhibitors and the interleukin 12/23 inhibitor ustekinumab, the consensus committee reported that there are good quality data showing efficacy in nails, including some studies showing superiority of TNF inhibitors to methotrexate and cyclosporine. For patients with moderate to severe nail involvement warranting the potential risks of these therapies, the preliminary recommendation for these agents was "strong" even if the costs of these therapies were characterized as "high to crazy."
One unresolved issue, however, is which strategy to recommend for placing nail involvement into "mild," "moderate," or "severe" categories. Objective scores, such as Nail Psoriasis Severity Index (NAPSI), were considered by the consensus committee to be helpful but insufficient.
"Perhaps in addition to objective scoring of nail disease, we should also take into account [the impact] on quality of life as well as function," Dr. Armstrong said.
The final GRAPPA treatment recommendations for nail involvement, as well as other aspects of PsA management, will be made after a discussion of the consensus group proposals over the next several months, followed by voting among the GRAPPA membership. As GRAPPA is an international organization, it is intended that final recommendations will be broadly applicable.
Dr. Armstrong reported financial relationships with AbbVie, Amgen, Janssen Biotech, Merck, Novartis, and Pfizer.