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    Outcomes of HLA-mismatched HSCT with TCR?ß/CD19 depletion or post-HSCT cyclophosphamide for inborn errors of immunity
    (2024) Lum, Su Han; Albert, Michael H.; Gilbert, Patrick; Sirait, Tiarlan; Algeri, Mattia; Muratori, Rafaella; Fournier, Benjamin; Laberko, Alexandra; Karakükcü, Musa; Ünal, Ekrem; Ayas, Mouhab F.; Yadav, Satya Prakash; Fışgın, Tunç; Elfeky, Reem; Fernandes, Juliana Folloni; Faraci, Maura; Cole, Theresa; Schulz, Ansgar S.; Meisel, Roland; Zecca, Marco; Ifversen, Marienne; Biffi, Alessandra; Diana, Jean-Sebastien; Vallee, Tanja C.; Giardino, Stefano; Ersoy, Gizem Zengin; Moshous, Despina; Gennery, Andrew R.; Balashov, Dmitry; Bonfim Carmem M. S.; Locatelli, Franco; Lankester, Arjan C.; Neven, Benedicte; Slatter, Mary A.
    HLA-mismatched transplants with either in vitro depletion of CD3+TCRαβ/CD19 (TCRαβ) cells or in vivo T-cell depletion using post-transplant cyclophosphamide (PTCY) have been increasingly used for patients with inborn errors of immunity (IEI). We performed a retrospective multicenter study via the EBMT registry on 306 children with IEI undergoing first transplant between 2010-2019 from an HLA-mismatched donor using TCRαβ (n=167) or PTCY (n=139). Median age at HSCT was 1.2 years (range, 0.03-19.6 years). The 3-year overall survival (OS) was 78% (95% confidence interval (CI), 71-84%) after TCRαβ and 66% (57-74%) after PTCY (p=0.013). Pre-HSCT morbidity score (hazard ratio (HR) 2.27, 1.07-4.80, p=0.032) and non-Busulfan/Treosulfan conditioning (HR 3.12, 1.98-4.92, p<0.001) were the only independent predictors of unfavorable OS. The 3-year event-free survival (EFS) was 58% (50-66%) after TCRαβ and 57% (48-66%) after PTCY (p=0.804). Cumulative incidence of severe acute GvHD was higher after PTCY (15%, 9-21%) than TCRαβ (6%, 2-9%, p=0.007), with no difference in chronic GvHD (PTCY, 11%, 6-17%; TCRαβ, 7%, 3-11%, p=0.173). The 3-year GvHD-free EFS was 53% (44-61%) after TCRαβ and 41% (32-50%) after PTCY (p=0.080). PTCY had significantly higher rates of veno-occlusive disease (14.4% versus TCRαβ 4.9%, p=0.009), acute kidney injury (12.7% versus 4.6%, p=0.032) and pulmonary complications (38.2% versus 24.1%, p=0.017). Adenoviraemia (18.3% versus PTCY 8.0%, p=0.015), primary graft failure (10%, versus 5%, p=0.048), and second HSCT (17.4% versus 7.9%, p=0.023) were significantly higher in TCRαβ. In conclusion, this study demonstrates that both approaches are suitable options in IEI patients, although characterized by different advantages and outcomes.