Environmental Air Pollution Is a Predictor of Poor Response to Biological Drugs in Chronic Inflammatory Arthritides.

We found that environmental air pollution was a determinant of poor response to bDMARDs in a cohort of patients with CIA followed over a 5-year period. An intervention aimed at decreasing fossil combustion emissions might have beneficial effects on biologic persistence rates of patients with CIA and economic expenditures related to switches and swaps.