Flow chart of the tREACH and FLARE study. The baseline work-up in tREACH patients included the GILZ/IL-2 assays. In FLARE patients, both a GC-binding assay and GILZ/IL-2 assays could be performed. In all patients, disease activity score (DAS) was measured at baseline and after 2 weeks of GC bridging therapy. #Only patients in the high-probability group eventually fulfilling the 1987 ACR criteria for RA were included in the final analysis. *Prednisone is tapered according to the following schedule: weeks 1 through 4, 15 mg/day, weeks 5 and 6, 10 mg/day; week 7 and 8, 5 mg/day; weeks 9 and 10, 2.5 mg/day. Intramuscular GCs could be either methylprednisolone, 120 mg, or triamcinolone acetonide, 80 mg. Baseline workup and start of standardized treatment occurred on the same day. GC, glucocorticoids; HAQ-DI, health assessment questionnaire disability index; HCQ, hydroxychloroquine; MTX, methotrexate; SSZ, sulfasalazine.