Abstract
A number of practical problems need to be addressed before any form of cell therapy can be widely applied in patients with multiple sclerosis. The choice of cell type is one considered elsewhere in this issue; others include the question of axon loss, that of continuing inflammatory disease activity, the mode of delivery of cells (bearing in mind the presence of innumerable lesions scattered throughout the CNS), the problem of measuring directly or indirectly the impact (if any) of an intervention, the timing of any treatment and perhaps above all the safety of the patient. All converge on the one increasingly relevant underlying question: when should stem cell treatments begin to be tested in patients? Here we review the progress in various of these practical problems in order to explain how we have arrived at the conclusion that the clinical science has progressed to a stage where the 'translation threshold' can be safely and appropriately crossed, and therefore why we have already commenced in Bristol a small pilot/feasibility study of autologous bone marrow cell treatment in patients with multiple sclerosis.
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