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What’s in a Name: Defining Difficult-to-Treat axSpA and PsA

June 15, 2024
in Health
What’s in a Name: Defining Difficult-to-Treat axSpA and PsA
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Despite an expanding arsenal of disease-modifying antirheumatic drugs (DMARDs), many patients with axial spondyloarthritis (axSpA) and psoriatic arthritis (PsA) still struggle to reach remission even after trying multiple advanced treatments.

Now, international groups of experts are working to better define these “difficult-to-treat” patients to both inform care and improve selection of participants for future clinical trials.

photo of Dr Denis PoddubnyyDenis Poddubnyy, MD

“The idea is rather simple, and the need is relatively ubiquitous,” Denis Poddubnyy, MD, of the Charité – Universitätsmedizin Berlin and the German Rheumatism Research Center Berlin, both in Berlin, Germany, said in an interview with Medscape Medical News. He is the co-primary investigator for the ongoing Assessment of SpondyloArthritis International Society (ASAS) project to develop a consensus definition of difficult-to-treat axSpA.

According to ASAS, only 40%-50% of patients with axSpA achieve a 40% improvement in ASAS response criteria (ASAS40), and few (10%-20%) achieve remission in the first 4-6 months of treatment.

“If you look into current clinical guidelines, you will see that there is no clear guidance,” on how to manage these patients, Poddubnyy continued. “In other similar recommendations for the treatment of axSpA, the only point which is clearly made with regards to nonresponders to effective anti-inflammatory treatment is to ‘check the diagnosis.'”

Multiple Reasons for Nonresponse

photo of Shikha SinglaShikha Singla, MD

“While the term difficult-to-treat can refer to refractory disease, that is not the only reason why a patient might not be responding to medication. In fact, it’s likely that truly biologically refractory disease makes up only a fraction of cases that respond inadequately to treatment,” said Shikha Singla, MD, who directs the psoriatic arthritis program at the Medical College of Wisconsin in Milwaukee. She is also involved with the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) initiative to define Difficult-to-Treat and Complex-to-Manage PsA.

“Apart from the persistent articular and periarticular inflammation, there could be multiple noninflammatory factors that may be contributing to this treatment-resistant disease, including comorbid conditions such as obesity, cardiovascular disease, fibromyalgia, and even social factors such as limited access to medications,” she told Medscape Medical News. “Given these complexities, it is a matter of supreme importance to recognize and carefully delineate the elements that contribute to treatment refractory disease: Is it truly the inflammation, or are there noninflammatory components that are causing the treatment failure, or a combination of the two?”

photo of Fabian ProftFabian Proft, MD

Other contributing factors could be depression, hypersensitization, and comorbidities that prevent certain treatment approaches, added Fabian Proft, MD, also of Charité – Universitätsmedizin Berlin. Proft discussed these difficult-to-treat definition efforts at the recent Spondyloarthritis Research and Treatment Network (SPARTAN) 2024 Annual Meeting held in Cleveland. Patients also might not be taking their medication regularly and may be seeking alternative medicine approaches, he said.

“There is a quite clear consensus within the community” that differentiation between these two groups is needed, Proft said.

The Definitions

Terminology for these two groups can vary by professional society. The European Alliance of Associations for Rheumatology (EULAR) published a definition for “difficult-to-treat” rheumatoid arthritis (RA) that includes cases with “both inflammatory activity and/or noninflammatory complaints.”

The definition includes three criteria:

Treatment according to EULAR recommendation and failure of at least two biologic DMARDs (bDMARDs) or targeted synthetic DMARDs (tsDMARDs) (with different mechanisms of action) after failing conventional synthetic DMARD therapy (unless contraindicated)Signs suggestive of active/progressive disease, including at least one of the following:Moderate disease activity (according to validated composite measures including joint counts)Signs (including acute phase reactants and imaging) and/or symptoms suggestive of active disease, whether joint-related or otherInability to taper glucocorticoid treatmentRapid radiographic progression (with or without signs of active disease)RA symptoms that are causing a reduction in quality of lifeSymptom/sign management perceived as problematic by the rheumatologist or the patient

All three criteria must be met.

Both GRAPPA and ASAS plan to use the term “difficult-to-treat” or “treatment refractory” to describe true biologically refractory inflammatory disease and are categorizing the larger, heterogenous group of nonresponders as “difficult-to-manage” (ASAS) or “complex-to-manage” (GRAPPA).

According to Poddubnyy, the agreed ASAS definition of difficult-to-manage has several similarities with EULAR’s RA definition, including three pillars:

Treatment according to existing recommendations and failure of at least two different bDMARDs or tsDMARDs with different mechanismsHaving signs and symptoms of disease (measured by high disease activity by certain disease activity indexes, persistently elevated C-reactive protein, inflammation on MRI, or rapid radiographic spinal progression)Symptoms/signs of disease that are considered problematic by the provider or patient

The definition was approved in January, and the manuscript is in the works, Poddubnyy said.

The GRAPPA project on PsA is still in its early stages, which so far has included a comprehensive literature review as well as a survey of GRAPPA members across 47 countries. The group is generally in agreement that two separate definitions for nonresponse to treatment are necessary, and that the “difficult-to-treat” definition — which identifies true refractory disease — should include objective signs of inflammation, Singla said.

Looking Forward

The next step of the ASAS project is to “define the pathway” from difficult-to-manage axSpA to treatment refractory disease, Poddubnyy said.

“What should be ruled out in order to exclude so-called noninflammatory causes of pain?” he continued. “It will require some Delphi exercises and [a] consensus approach.”

Proft anticipates that this treatment refractory definition in both axSpA and PsA will be most useful in research, rather than clinical practice.

“It is really important to have unified definition criteria to shape as homogeneous a cohort as possible,” he said, for future clinical trials in this population.

On the other hand, the complex/difficult-to-manage definition may be more useful for clinical practice, Proft thought.

“If you see a patient not responding to treatment, the easiest thing you can do would be to change treatment,” like swapping one biologic for another, Poddubnyy added, “but this would not be the right approach in every patient.” One goal of these initiatives is to give guidance on “what things should be looked after or excluded before you conclude this is biological [nonresponse],” he said.

Singla consults for AbbVie, Janssen, and UCB and received research funding from Eli Lilly. Poddubnyy disclosed serving as a speaker, consultant, and/or research grant recipient for multiple companies including AbbVie, Lilly, Merck Sharp and Dohme, Novartis, Pfizer, GlaxoSmithKline, Novartis, and UCB. Proft reported receiving research grants, consultant fees, or support for attending meetings and/or travel from Amgen, AbbVie, Bristol Myers Squibb, Celgene, Eli Lilly, Janssen, Merck Sharp and Dohme, Novartis, Pfizer, Roche, UCB, Medscape Medical News, Galapagos, and Hexal. Proft also participants on a data safety monitoring board or advisory board for AbbVie, Celgene, Janssen, Novartis, and UCB.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Medscape – https://www.medscape.com/viewarticle/whats-name-defining-difficult-treat-axspa-and-psa-2024a1000b5i

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