first hand experience
Is no scientific measurement. First hand experience is your experience.
A treatment in medicine needs to prove its safety & efficacy (wherever possible) in double-blind randomized placebo controlled studies/clinical trials which can be reproduced multiple times by independent researchers yielding the same results with an adequate sample size of patients that match defined criteria. Thoroughly backened by prior theory and/or understanding of action of the supposed treatment. In case of stem cells probably a combined multidisciplinary approach of neuroscience, bioengineering and chemistry.
Single case reports lack ALL of the above features. This does not discredit them. People may share the same experience in many aspects of life.
But I think it is vitally important to understand the basics of how a drug or other treatment is tested in order to make a educated choice concerning wether or not they want to invest their resources into a novel or controversial approach in order to treat their condition. Unfortunately there are people out there that take advantage of other peoples desperation. Especially when it comes to conditions that are regarded as incurable.