To determine whether patient global assessment of disease activity (PtGA) over the first year of disease course, as part of a Boolean-based definition of remission and considered individually, had a significant relationship with structural progression over 3 years in patients with early arthritis.
We conducted a prospective, observational study using ESPOIR (Étude et Suivi des Polyarthrites Indifférenciées Récentes) cohort data. Remission states were defined as 1) 4-variable remission, which included a tender joint count in 28 joints, a swollen joint count in 28 joints (SJC28), a C-reactive protein (CRP; mg/dl) level, and PtGA (scored 0-10, all scores of ≤1); 2) PtGA near remission, which included the same parameters as 4-variable remission with only PtGA >1 (of a maximum possible score of 10); 3) 3-variable remission (sum of the proportion of patients in 4-variable remission and the proportion of patients in PtGA near remission); or 4) nonremission. The strictest status satisfied both at 6 and 12 months was considered. Radiographic progression was determined as a change of ≥5 points in the total Sharp/van der Heijde score (ΔSHS) from baseline to 3 years. The predictive capacities for radiographic damage of different remission definitions were assessed by odds ratio (OR). The association between each individual component of remission with ΔSHS was tested through multivariate linear regression analyses.
Among 520 patients, 7% achieved 4-variable remission and 12% achieved PtGA near remission. Radiographic progression was observed in 29% of patients who achieved 4-variable remission (OR versus nonremission; OR 0.32 [95% confidence interval (95% CI) 0.15, 0.68]) and in 45% of patients with PtGA near remission (OR 0.65 [95% CI 0.38, 1.11]); the comparison was not statistically different (OR 0.49 [95% CI 0.20, 1.18]). In 3-variable remission, radiographic progression was observed in 39%. Of the individual components, only the SJC28 and CRP level were associated with radiographic progression.
All definitions of remission led to low structural degradation in early arthritis, and 4-variable remission led to less radiographic progression than PtGA near remission, but without a statistically significant difference. Both 4-variable remission and 3-variable remission appear to be useful targets when aiming for structural nonprogression.