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Infliximab levels. Circulating infliximab (IFX) trough levels measured by functional reporter gene assay (RGA) in patients with IFX treatment failure due to nonimmune pharmacokinetics (PK) (n = 18) or pharmacodynamics (PD) (n = 8) at time of treatment failure (week 0) and after 12 weeks of intensified IFX regimen.
