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Correspondence |

How Safe Could Intrathecal Transplantation of Mesenchymal Stem Cells Be Considered in Multiple Sclerosis?—Reply

Dimitrios Karussis, MD, PhD; Adi Vaknin-Debminsky, MD, PhD; Oded Abramsky, MD, PhD; Ibrahim Kassis, PhD; Panayiota Petrou, MD; Tamir Ben Hur, MD, PhD
Arch Neurol. 2011;68(7):955-956. doi:10.1001/archneurol.2011.162.
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Karacostas and colleagues express their concerns about safety issues arising from our trial with MSCs in MS and ALS.1 Our detailed responses to each question raised follow.

Concerning general safety issues, in our phase I/II study, our main goal was to investigate the feasibility and short-term safety of the treatment modality. We were able to rule out any short-term toxicity, as shown by the 6-month follow-up. Additionally, as mentioned in the manuscript, we followed up the patients for up to 3 years and were not confronted with any exceptional clinical change. We performed yearly MRI scans in all patients that did not reveal any unexpected pathology (up to at least 3 years) and continued to show stabilization and suppression of the disease (follow-up data not yet published). We definitely share the concerns regarding unknown long-term toxicities, especially because previous experience with other treatments of MS (natalizumab, linomide) has shown that small-scale trials are not sensitive enough to rule out all possible adverse effects. This is clearly underlined in our conclusions that “ . . . larger studies are warranted to establish the long term safety and efficacy of this modality. . . . ”

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July 1, 2011
Dimitris Karacostas, MD, PhD; George Hadjigeorgiou, MD, PhD; Panos Ioannidis, MD, PhD; Ioannis Milonas, MD, PhD
Arch Neurol. 2011;68(7):955-956. doi:10.1001/archneurol.2011.161.
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