Arundathi Jayatilleke, MD
The potential to prevent clinical rheumatoid arthritis (RA) in patients at risk of developing arthritis is of long-standing interest in the rheumatology community. Other studies have addressed the potential for early treatment with glucocorticoids, hydroxychloroquine, or biologics to prevent arthritis, with mixed results. Few published studies have assessed the efficacy of methotrexate in the prevention of arthritis. A randomized controlled trial by Krijbolder and colleagues of adults with arthralgias deemed to be at risk for progression to RA evaluated the use of a single intramuscular steroid injection combined with 1 year of oral methotrexate, compared with placebo, for preventing the development of RA according to the 2010 American College of Rheumatology classification criteria. Although no difference was seen between the groups in development of RA, those treated with methotrexate did have lower levels of joint inflammation seen on MRI and better functional status as per Health Assessment Questionnaire score.
Su and colleagues also looked at the impact of different medications on the development of RA. Using a national health insurance database in Taiwan (between 1997 and 2013), they studied the use of biguanides and sulfonylureas in patients with diabetes and the risk for incident RA. In over 90,000 patients with diabetes, a longer duration of sulfonylurea or biguanide prescription within the first 3 years of diabetes diagnosis was associated with a lower risk for RA compared with non-use. However, use of any antihyperglycemic agents was also associated with lower risk for RA incidence. Limited information is available on both the severity of diabetes and activity of RA, so even a potential mechanism in terms of reduction of blood glucose or inflammation is hard to determine, and more detailed studies are needed.
The safety of different treatments during pregnancy, as well as the effect of both RA and its treatment on pregnancy outcomes, have been areas of research interest in terms of counseling patients with RA about pregnancy planning and management of medications. Gerardi and colleagues followed 63 patients with RA prospectively during pregnancy. They found that although the general understanding is that inflammatory arthritis improves during pregnancy, the percentage of patients with moderate and high disease activity increased slightly, and 37% of patients experienced a flare. Flares were associated with elevated C-reactive protein (CRP) levels and use of multiple prior biologic disease-modifying antirheumatic drugs (bDMARD) (suggesting overall more active arthritis), as well as bDMARD discontinuation in early pregnancy. Similarly, preterm delivery was associated with elevated CRP, higher Disease Activity Score-28 scores, and flares. The study findings provide further support for the importance of controlling maternal disease activity in favoring a better RA course as well as better pregnancy outcomes.
Smeele and colleagues recently published an analysis of the PreCARA cohort study looking at birthweight in pregnant patients with RA. RA is associated with children being born small for gestational age . In this cohort study of 188 pregnant patients with RA, the treatment protocol before pregnancy included hydroxychloroquine, sulfasalazine, prednisone, and anti–tumor necrosis factor (TNF) agents (adalimumab, infliximab, etanercept, and certolizumab). Anti-TNF medications were stopped at 20, 20, 28, or 38 weeks, respectively, according to the European Alliance of Associations for Rheumatology (EULAR) recommendations. In terms of gestational age at delivery and congenital malformations, no difference was seen between patients who used anti-TNF agents during pregnancy and those who did not. Anti-TNF use during pregnancy was associated, however, with increased birthweight and a lower percentage of infants who were small for gestational age. These findings are in keeping with those of prior studies, although larger studies would be helpful in determining whether there are critical periods during pregnancy that have a significant effect on birthweight or whether overall control of inflammation is the predominant factor.