Hypogammaglobulinemia and Infections in Patients With Multiple Sclerosis Treated With Rituximab. Issue 1 (January 2022)

• Record Type: Journal Article
• Authors: Perriguey, Marine; Maarouf, Adil; Stellmann, Jan-Patrick; Rico, Audrey; Boutiere, Clemence; Demortiere, Sarah; Durozard, Pierre; Pelletier, Jean; Audoin, Bertrand
• Is Part Of: Neurology. Volume 9:Issue 1(2022)
• Publication Date: 2022-01
• Subjects: Neuroimmunology -- Periodicals; Neurology -- Periodicals; 616.8
• DOI: 10.1212/NXI.0000000000001115
• Languages: English
• ISSNs: 2332-7812

Abstract

Abstract : Background and Objectives: To determine the frequency of hypogammaglobulinemia and infections in patients with multiple sclerosis (PwMS) receiving rituximab (RTX). Methods: This prospective observational study included all consecutive PwMS receiving RTX at the university hospital of Marseille, France, between 2015 and 2020. Patient visits occurred at least every 6 months. Results: We included 188 patients (151 with relapsing-remitting MS; the mean age was 43.4 years [SD 12.9], median disease duration 10 years [range 0–36], median Expanded Disability Status Scale 5 [range 0–8], median follow-up 3.5 years [range 1–5.8], and median number of RTX infusions 5 [range 1–9]). Overall, 317 symptomatic infections and 13 severe infections occurred in 133 of 188 (70.7%) and 11 of 188 (5.9%) patients, respectively. After 4 years, 24.4% of patients (95% CI 18.0–33.1) were free of any infection and 92.0% (95% CI 87.1–97.1) had not experienced a severe infection. At RTX onset, the immunoglobulin G (IgG) level was abnormal in 32 of 188 (17%) patients. After RTX, IgG level was <7, <6, <4 and <2 g/L for 83 (44%), 44 (23.4%), 8 (4.2%) and 1 (0.53%) patients, respectively. The risk of infection was associated with reduced IgG levels (multivariate Cox proportional hazards hazard ratio [HR] = 0.86, 95% CI 0.75–0.98, p = 0.03). The risk of reduced IgG level <6 g/L increased with age (HR = 1.36, 95% CI 1.05–1.75, p = 0.01). Discussion: In PwMS receiving RTX, reduced IgG level was frequent and interacted with the risk of infection.