Insights into Facilitated Subcutaneous Immunoglobulin Use in Patients with Secondary Immunodeficiency Diseases: A FIGARO Subgroup Analysis

SIMPLE SUMMARY: The prospective, observation Facilitated Immunoglobulin Administration Registry And Outcomes (FIGARO) study was conducted to assess the clinical use and tolerability of facilitated subcutaneous immunoglobulin (fSCIG). In this report, final data for the cohort of patients with secondary immunodeficiency (SID) (n = 31, mean age 61.4 years) are presented. The median monthly dose of fSCIG (30 g) and median monthly infusion volume per patient (300 mL) were constant and serum immunoglobulin (Ig) trough levels increased over the observation period (36 months). Most patients required one infusion site and received the full dose every 3–4 weeks. Infusion site inflammation or headache were reported at inclusion (n = 1 each). No adverse drug reactions were reported during follow-up. The observed efficacy and tolerability of fSCIG and the possibility of self-administration at home demonstrated that fSCIG positively influenced the treatment experience for patients with SID, most of whom were elderly with a high comorbidity burden. ABSTRACT: The Facilitated Immunoglobulin Administration Registry And Outcomes (FIGARO) Study was a European, multicenter, prospective, observational study conducted across Europe designed to provide insights on the clinical use and tolerability of facilitated subcutaneous immunoglobulin (fSCIG). Data herein are reported for the cohort of patients with secondary immunodeficiency (SID), with a subgroup analysis by age. The SID cohort included 31 patients: 1 pediatric, 15 adult, and 15 older adult patients. Over the 36-month observation period, the median monthly dose of fSCIG (30 g) and median monthly infusion volume per patient (300 mL) remained constant in both adult-age cohorts. Serum trough levels tended to increase over time. Most patients required only one infusion site and could receive the full dose every 3–4 weeks. There was a trend toward self-administration at home. In the adult group, infusion site inflammation and headache were reported at the inclusion visit (n = 1 each), with no adverse drug reactions reported at any of the follow-up visits. No acute severe bacterial infections were reported during the study follow-up. These results demonstrate the feasibility and tolerability of fSCIG use in patients with SID and the flexibility of administration settings including self-administration at home in patients aged ≥65 years.