Arundathi Jayatilleke, MD
Several recent studies have evaluated risks of therapy in rheumatoid arthritis (RA). One question regarding treatment of early RA is whether different initial treatment strategies confer different risks. In a systematic review with network meta-analysis, Adas et al reviewed differences between methotrexate, biologic disease-modifying antirheumatic drug (bDMARD), and steroid use in early RA. Overall, risk of serious adverse events was higher with bDMARD monotherapy than methotrexate monotherapy. Of note, while generally long-term steroid use is disfavored due to adverse effects, serious adverse events were not increased in patients treated with methotrexate and steroids together. The size of differences in risk was small and study heterogeneity, including the class of bDMARDs, limits generalizability of this information; thus, variations in the studies themselves may account for these differences.
Pazmino et al also looked at treatment strategies in early RA in a post hoc analysis of participants at “low-risk” for poor prognosis in the CareRA trial, in which patients were randomized to step-up methotrexate without glucocorticoids or step-down with glucocorticoids. While pain scores and disease activity scores were similar among the two groups, analgesic use (including non-steroidal anti-inflammatory drugs [ NSAIDs] and opioids) was significantly lower among those randomized to the glucocorticoid-bridging arm. Though this information is reassuring as to the utility of glucocorticoids, it is not clear that this correlation is broadly applicable, for example, among the “higher-risk” patients who might otherwise be more likely to receive glucocorticoids.
A recent analysis of the COVID-19 global rheumatology alliance physician registry by Sparks et al of cases of COVID-19 in patients with rheumatic disease looked more specifically at COVID-19 outcomes in patients with RA on biologic therapy. These are of interest due both to the risk of immunosuppression overall as well as the use of immunosuppressive medications in COVID-19-associated hyperinflammation. The study evaluated outcomes of hospitalization (including respiratory support and mortality). While hospitalization is difficult to evaluate as an outcome without knowing the background rate of COVID in the different areas, of the hospitalized patients, patients who used Janus kinase inhibitors (JAKi) and rituximab received oxygen or ventilator support and had higher mortality than those who were on abatacept, IL-6 inhibitors, or TNF inhibitors. Wider interpretation is difficult due to lack of knowledge of when medications were given (including rituximab dosing), but the results suggest that concern is warranted in improving outcomes for patients with RA on these therapies.
Finally, regarding the well-known cardiovascular risk associated with RA, several observational studies have suggested that methotrexate is associated with reduction in risk of cardiovascular events. This cohort study of the Veterans Affairs RA registry followed over 2000 patients for a mean of about 5 years; a reduction in incidence of cardiovascular events was associated with methotrexate use, independent of age, body mass index (BMI), cardiovascular risk factors, RA disease activity, and other RA therapies. It may be that methotrexate use is associated with an unknown mediator of cardiovascular disease not evaluated in this study, such as reduced glucocorticoid or NSAID use, but this area deserves further investigation.