Long-term Clinical Outcomes of Hematopoietic Stem Cell Transplantation in Multiple Sclerosis
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Abstract
Objective To determine whether autologous hematopoietic stem cell transplantation (aHSCT) is able to induce durable disease remission in people with multiple sclerosis (MS), we analyzed the long-term outcomes after transplantation in a large cohort of patients with MS.
Methods To be included, a minimum dataset (consisting of age, MS phenotype, Expanded Disability Status Scale [EDSS] score at baseline, information on transplantation technology, and at least 1 follow-up visit after transplantation) was required.
Results Two hundred ten patients were included (relapsing-remitting [RR] MS 122 [58%]). Median baseline EDSS score was 6 (1–9); mean follow-up was 6.2 (±5.0) years. Among patients with RRMS, disability worsening–free survival (95% confidence interval [CI]) was 85.5% (76.9%–94.1%) at 5 years and 71.3% (57.8%–84.8%) at 10 years. In patients with progressive MS, disability worsening–free survival was 71.0% (59.4%–82.6%) and 57.2% (41.8%–72.7%) at 5 and 10 years, respectively. In patients with RRMS, EDSS significantly reduced after aHSCT (p = 0.001; mean EDSS change per year −0.09 [95% CI −0.15% to −0.04%]). In patients with RRMS, the use of the BCNU+Etoposide+Ara-C+Melphalan (BEAM) + anti-thymocyte globulin (ATG) conditioning protocol was independently associated with a reduced risk of no evidence of disease activity 3 failure (hazard ratio 0.27 [95% CI 0.14–0.50], p < 0.001). Three patients died within 100 days from aHSCT (1.4%); no deaths occurred in patients transplanted after 2007.
Conclusions aHSCT prevents disability worsening in the majority of patients and induces durable improvement in disability in patients with RRMS. The BEAM + ATG conditioning protocol is associated with a more pronounced suppression of clinical relapses and MRI inflammatory activity.
Classification of Evidence This study provides Class IV evidence that for people with MS, aHSCT induces durable disease remission in most patients.
Glossary
- aHSCT=
- autologous hematopoietic stem cell transplantation;
- ATG=
- anti-thymocyte globulin;
- CI=
- confidence interval;
- CY=
- cyclophosphamide;
- DMT=
- disease-modifying therapy;
- EDSS=
- Expanded Disability Status Scale;
- HR=
- hazard ratio;
- MS=
- multiple sclerosis;
- NEDA=
- no evidence of disease activity;
- RRMS=
- relapsing-remitting MS
Footnotes
Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
Coinvestigators are listed in appendix 2 at the end of the article.
Class of Evidence: NPub.org/coe
- Received May 11, 2020.
- Accepted in final form October 23, 2020.
- © 2021 American Academy of Neurology
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