Clinical and economic impact of the use of etanercept 25 mg once weekly in rheumatoid arthritis, psoriatic arthropathy and ankylosing spondylitis patients

Objective: To determine the clinical and economic impact of etanercept 25 mg/week (ETN25) on rheumatoid arthritis (RA), psoriatic arthropathy (PA) and ankylosing spondylitis (AS) patients in sustained clinical remission. Methods: Observational, retrospective cohort of patients treated with etanercept 50 mg/week (ETN50) who achieved and maintained clinical remission (Disease Activity Score 28 < 2.6 or BASDAI < 2) over a period of 1 year and had slow worsening of structural changes were enrolled in an off-label program (January 2006 to June 2013) to switch from ETN50 to ETN25. Economic impact was assessed using Enbrel® official prices for Spain. Results: From 1 January 2006 to 1 June 2013, 98 RA, 40 PA and 47 AS patients were treated with ETN50; 39 (24%) patients (20 women; age = 53 ± 7 years; 24 RA, 7 PA, 8 AS) received ETN25 for at least 0.5 years (2.6 ± 2.0 years; range = 0.5 – 7.3 years). As of 1 June 2013, 29 (74%) patients continued on ETN25. RA patients: 17 patients continued on ETN25, 5 patients dis...