IgA nephropathy (IgAN) is a kidney disorder characterized by the buildup of immunoglobin A (IgA) in the glomeruli, which are bundles of capillaries that filter blood in the kidney. In advanced stages of the disease, the buildup of IgA in the glomeruli disrupts kidney functioning and, in approximately 30% to 40% of cases, leads to kidney failure. IgA is thought to form complexes with IgG, IgM, and C3 proteins in the blood and then accumulate in the glomeruli during filtration.

Tofacitinib (Xeljanz) in patients with rheumatoid arthritis (RA) stood out among several other biologic and targeted synthetic disease-modifying antirheumatic drugs (sDMARDs) when it came to the incidence of interstitial lung disease (ILD), a retrospective cohort study showed.