JAK Inhibitors, Biologics Show Nuances in RA Pain Outcomes

TOPLINE:

Janus kinase (JAK) inhibitors had a marginally superior effect on pain relief when compared with tumor necrosis factor (TNF) inhibitors in patients with rheumatoid arthritis (RA), particularly when used as monotherapy and in those previously treated with at least two biologic disease-modifying antirheumatic drugs (DMARDs), but their pain reduction effects were similar to those of non–TNF inhibitor biologic DMARDs.

METHODOLOGY:

• Researchers aimed to compare the effect of JAK inhibitors and each class of biologic DMARDs such as TNF inhibitors, rituximab, abatacept, and interleukin (IL)-6 inhibitors on pain in patients with RA in clinical practice.
• They included 8430 patients with RA who were initiated on either a JAK inhibitor (n = 1827), TNF inhibitor (n = 6422), IL-6 inhibitor (n = 887), abatacept (n = 1102), or rituximab (n = 1149) in 2017-2019.
• Differences in the change in pain, assessed using a visual analog scale (VAS; 0-100 mm), from baseline to 3 months were compared between the treatment arms.
• The proportion of patients who continued their initial treatment with low pain levels (VAS pain,
• The comparisons of treatment responses between JAK inhibitors and biologic DMARDs were analyzed using multivariate linear regression, adjusted for patient characteristics, comorbidities, current co-medication, and previous treatment.

TAKEAWAY:

• Pain scores improved from baseline to 3 months in all the treatment arms, with mean changes ranging from −20.1 mm (95% CI, −23.1 to −17.2) for IL-6 inhibitors to −16.6 mm (95% CI, −19.1 to −14.0) for rituximab.
• At 3 months, JAK inhibitors reduced pain scores by 4.0 mm (95% CI, 1.7-6.3) more than TNF inhibitors and by 3.9 mm (95% CI, 0.9-6.9) more than rituximab; however, the change in pain was not significantly different on comparing JAK inhibitors with abatacept or IL-6 inhibitors.
• The superior pain reducing effects of JAK inhibitors over those of TNF inhibitors were more prominent in those who were previously treated with at least two biologic DMARDs and when the treatments were used as monotherapy.
• At 12 months, 19.5% of the patients receiving JAK inhibitors continued their treatment and achieved low pain levels, with the corresponding proportions ranging from 17% to 26% for biologic DMARDs; JAK inhibitors were more effective in reducing pain than TNF inhibitors, although the difference was not statistically significant.

IN PRACTICE:

“JAK inhibitors yield slightly better pain outcomes than TNF inhibitors. The magnitude of these effects is unlikely to be clinically meaningful in unselected groups of patients with RA,” experts from Feinberg School of Medicine, Northwestern University, Chicago, wrote in an accompanying editorial. “Specific subgroups, such as those who have tried at least two DMARDs, may experience greater effects,” they added.

SOURCE:

The study was led by Anna Eberhard, MD, Department of Clinical Sciences, Lund University, Malmö, Sweden. It was published online on September 22, 2024, in Arthritis & Rheumatology.

LIMITATIONS:

The study had a significant amount of missing data, particularly for follow-up evaluations, which may have introduced bias. The majority of patients were treated using baricitinib, potentially limiting the generalizability to other JAK inhibitors. Residual confounding could not be excluded despite adjustments for multiple relevant patient characteristics.

DISCLOSURES:

This study was supported by grants from The Swedish Research Council, The Swedish Rheumatism Association, and Lund University. Some authors declared receiving consulting fees, payments or honoraria, or grants or having other ties with pharmaceutical companies and other sources.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.