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Hematopoietic Stem Cell Transplantation in People With Active Secondary Progressive Multiple Sclerosis
Giacomo Boffa1, Alessio Signori1, Luca Massacesi1
1From the Department of Neurology, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (G.B., E.S., G.L.M., M.I.), University of Genoa; Biostatistics Unit (A.S., M.P.S.), Department of Health Sciences, University of Genoa; Department of Neurosciences Drugs and Child Health (L. Massacesi, A.M.), University of Florence; and Department of Neurology 2 (L. Massacesi, A.M., A.M.R.), Careggi University Hospital, Florence; Department of Neurology (S.C.), A.R.N.A.S. CIVICO, Palermo; Department NEUROFARBA (M.P.A.), Section Neurological Sciences University of Florence; IRCCS Fondazione Don Carlo Gnocchi, (M.P.A) Florence; Department of Neurology (C.G.), Ospedale San Camillo-Forlanini, Rome; Neurology Unit (L. Moiola, M.F.), Neurorehabilitation Unit (F.M.), Neurophysiology Service (F.M.), Neuroimaging Research Unit, Division of Neuroscience (F.M.), IRCCS San Raffaele Scientific Institute, Milan, Italy; Vita-Salute San Raffaele University (F.M.), Milan; Department Biomedical Metabolic and Neural Sciences (S.M.), University of Modena and Reggio Emilia, Modena, Italy; Department of Neuroscience, Neurology Unit (S.M., P.S.), Azienda Ospedaliera Universitaria, Modena; Neurosciences and Reproductive and Odontostomatological Sciences (V.B.M.), University "Federico II," Naples; Department of Biomedicine, Neurosciences and Advanced Diagnostics (G.S.), University of Palermo; Department of Medical and Surgical Sciences and Advanced Technologies (F.P.), AOU Policlinico-San Marco, University of Catania; MS Centre, Neurology Unit (G.D.L.), SS. Annunziata University Hospital, Chieti; Department of Advanced Medical and Surgical Sciences (G.L.), 2nd Division of Neurology, University of Campania "Luigi Vanvitelli," Naples; Centro Sclerosi Multipla (M.Z.), ASST della Valle Olona, Ospedale di Gallarate, Italy; IRCCS Neuromed (A.C.), Pozzilli (IS); Department of Human Neuroscience (A.C., R.N.) and Dipartimento di Neuroscienze, Salute Mentale e Organi di Senso (NESMOS) (S.R.) Sapienza University, Rome; S.Andrea Multiple Sclerosis Center (R.N.), Sapienza University, Rome; S.Andrea Hospital (S.R.), Rome; Department of Medical and Surgical Sciences (U.A.), Magna Greacia University of Catanzaro; Unit of Neurosciences, Department of Medicine and Surgery (F.G.), University of Parma; Department of Neurosciences (S.G.), San Camillo-Forlanini Hospital, Rome; Department of Neuroscience and Rehabilitation (L.M.C.), Azienda Ospedaliero-Universitaria di Ferrara; IRCCS Istituto delle Scienze Neurologiche di Bologna (A.L.); Dipartimento di Scienze Biomediche e Neuromotorie (A.L.), Università di Bologna; Department of Basic Medical Sciences, Neurosciences and Sense Organs (P.I., M.T.), University of Bari Aldo Moro; Department of Medical Science and Public Health (E.C), University of Cagliari, Cagliari; Multiple Sclerosis Center, Binaghi Hospital, ASL Cagliari; Department of Cellular Therapies and Transfusion Medicine (R.S.), Careggi University Hospital, Florence; Ematologia e Terapie Cellulari (E.A.), Ospedale Policlinico IRCCS San Martino (M.P.S.), Genoa; Istituti Clinici Scientifici Maugeri (G.L.M.), Pavia; Ospedale Policlinico IRCCS San Martino (M.I.), Genoa, Italy.
Background And Objectives:
Uncontrolled evidence suggests that autologous hematopoietic stem cell transplantation (AHSCT) can be effective in people with active secondary progressive multiple sclerosis (SPMS). In this study, we compared the effect of AHSCT with that of other anti-inflammatory disease-modifying therapies (DMTs) on long-term disability worsening in active SPMS.
Methods:
We collected data from the Italian Bone Marrow Transplantation Study Group and the Italian Multiple Sclerosis Register. Patients were considered eligible if treatment had been started after the diagnosis of SPMS. Disability worsening was assessed by the cumulative proportion of patients with a 6-month confirmed disability progression (CDP) according to the Expanded Disability Status Scale (EDSS) score. Key secondary endpoints were the EDSS time trend after treatment start and the prevalence of disability improvement over time. Time to first CDP was assessed by means of proportional hazard Cox regression models. A linear mixed model with a time × treatment group interaction was used to assess the longitudinal EDSS time trends. Prevalence of improvement was estimated using a modified Kaplan-Meier estimator and compared between groups by bootstrapping the area under the curve.
Results:
Seventy-nine AHSCT-treated patients and 1975 patients treated with other DMTs (beta interferons, azathioprine, glatiramer-acetate, mitoxantrone, fingolimod, natalizumab, methotrexate, teriflunomide, cyclophosphamide, dimethyl fumarate, and alemtuzumab) were matched to reduce treatment selection bias using propensity score and overlap weighting approaches. Time to first CDP was significantly longer in transplanted patients (hazard ratio [HR] = 0.50; 95% CI = 0.31-0.81; p = 0.005), with 61.7% of transplanted patients free from CPD at 5 years. Accordingly, EDSS time trend over 10 years was higher in patients treated with other DMTs than in AHSCT-treated patients (+0.157 EDSS points per year compared with -0.013 EDSS points per year; interaction p < 0.001). Patients who underwent AHSCT were more likely to experience a sustained disability improvement: 34.7% of patients maintained an improvement (a lower EDSS than baseline) 3 years after transplant vs 4.6% of patients treated by other DMTs (p < 0.001).
Discussion:
The use of AHSCT in people with active SPMS is associated with a slowing of disability progression and a higher likelihood of disability improvement compared with standard immunotherapy.
Classification Of Evidence:
This study provides Class III evidence that autologous hematopoietic stem cell transplants prolonged the time to CDP compared with other DMTs.
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