Abstract
Introduction
Individualized dosing is an established approach in intravenous immunoglobulin (IVIg) treatment for inflammatory neuropathies. There is less experience in effective dosing strategies for subcutaneous (SC) immunoglobulin.
Methods
We conducted a retrospective cohort study of patients with inflammatory neuropathies transferring from IVIg to SCIg in two UK peripheral nerve services. I-RODS and grip strength were used to measure outcome. Dose and clinical progress were documented at 1 year and at last review.
Results
44/56 patients remained on maintenance SCIg beyond 1 year (mean 3.3 years, range 1–9 years) with stable clinical outcomes. Clinical deteriorations were corrected by small increases in SCIg dose in 20 patients at 1 year, a further 9 requiring subsequent further up-titrations. Sixteen tolerated dose reduction. Mean dose change was + 2.4% from baseline. Two patients required IVIg bolus rescue (2 g/kg). Three patients successfully discontinued Ig therapy. Nine patients returned to IVIg due to clinical relapse or patient preference. Overall tolerance was good.
Discussion
Dose titration to clinical response is an effective approach in SCIg maintenance therapy.
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Data availability
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
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Acknowledgements
MK gratefully received funding from a patient’s bequest. Professor Reilly is grateful to the Medical Research Council (MRC), MRC Centre grant (G0601943), and the National Institutes of Neurological Diseases and Stroke and office of Rare Diseases (U54NS065712) for their support. Dr Lunn and Dr Carr are also supported by the National Institute for Health Research University College London Hospitals Biomedical Research.
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Dr. Lunn was a Primary Investigator in studies for CSL Behring, UCB Pharma, Novartis, and Octapharma. He has also received ad hoc consulting fees from CSL Behring, UCB and an honorarium from Terumo BCT. Dr. Carr reports Grifols sponsorship for attendance at meeting and honorarium from CSL and Lupin for an advisory role. Dr Lavin reports sponsorship from CSL Behring and honorarium from CSL Behring and Grifols. Dr Kapoor reports Grifols sponsorship for attendance at meeting. The remaining authors have no conflicts of interest.
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Kapoor, M., Keh, R., Compton, L. et al. Subcutaneous immunoglobulin dose titration to clinical response in inflammatory neuropathy. J Neurol 268, 1485–1490 (2021). https://doi.org/10.1007/s00415-020-10318-3
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DOI: https://doi.org/10.1007/s00415-020-10318-3