Given the frequency of autoimmune conditions in women, the possible effects of estrogen and hormonal therapy exposure over the lifespan on the development of rheumatoid arthritis (RA) has long been of interest. Prior studies have identified a potential increase in RA risk in older women taking estrogen replacement. Hadizadeh and colleagues used the UK Biobank to identify cases of RA among over 236,000 women taking oral contraceptives and over 102,000 women taking hormone replacement therapy. Oral contraceptive use was associated with lower risk for RA (hazard ratio [HR] 0.89), whereas hormone replacement therapy was associated with higher risk for RA (HR 1.16) compared with women who had never used these therapies. Exogenous estrogen exposure may affect the development of RA, but the potential mechanisms (including the effect on systemic inflammation) remain unclear.
Among the multitude of studies on a treat-to-target (T2T) strategy in RA, a recent cluster randomized trial by Bessette and colleagues compared use of abatacept in 284 patients treated by 44 physicians. Patients assigned to both T2T and routine care had significant improvement in RA disease activity (as measured by the Clinical Disease Activity Index) with abatacept, with close to 40% in low disease activity at 12 months. Those treated with routine care experienced significant improvements in RA disease activity at 12 months of abatacept treatment. T2T was associated with slightly higher odds of low disease activity and a shorter time to Simplified Disease Activity Index remission (14 vs 19 months). With T2T being largely accepted as a standard of care on the basis of prior studies, this study raises the question of why little difference was seen between the two groups — perhaps it was related to the use of abatacept. It is unlikely to further change the standard of care to reduce use of disease activity measures.
To better understand refractory or difficult-to-treat (D2T) RA, Jung and colleagues used the KOBIO (KOrean College of Rheumatology BIOlogics) registry to compare characteristics of patients with D2T RA vs those who respond more readily to therapy. Of the 2321 patients included in the study, about 12% (271) had D2T RA. Patients with D2T RA tended to be younger and have longer disease duration, as well as a negative rheumatoid factor (RF); less use of conventional synthetic disease-modifying antirheumatic drugs (csDMARD); and, as expected, higher disease activity measures. Given that about 80% of patients were seropositive for RF and the fact that patients with D2T RA tended to have higher inflammatory markers (erythrocyte sedimentation rate and C-reactive protein), it is not likely that patients were misclassified with RA. The reason why patients with D2T RA had less csDMARD use is not clear, but prior studies have supported early and aggressive use of csDMARD for best outcomes. The study did suggest that patients with D2T RA stayed on Janus kinase (JAK) inhibitor therapy the longest, and perhaps similar studies in future will help outline the best treatment strategy for patients with D2T RA and persistently high disease activity.
Finally, in a post hoc analysis of the ORAL Start trial of the JAK inhibitor tofacitinib vs methotrexate, Ciurea and colleagues looked at paired joint pathology scores (PJPS) — swollen and tender joint counts with left and right pooled — over the course of the 12-month study. Patients receiving tofacitinib had overall improved PJPS, though patients receiving methotrexate had more improvement in the foot. These findings, generally supporting those of the initial study, are unlikely to further change therapy.