Amgen (AMGN) announced positive results from the phase III MITIGATE study, which evaluated its rare disease drug Uplizna (inebilizumab) for treating Immunoglobulin G4-related disease (IgG4-RD), a rare inflammatory condition.The MITIGATE study achieved its primary endpoint — patients treated with Uplizna over a 52-week period showed a statistically significant 87% reduction in the risk of IgG4-RD flare when compared with a placebo. The study also achieved key secondary endpoints, which include annualized fla ...