Risks of stem cell treatment for autism include site infection, meningitis, tumors in brain or at injection site, fever, seizure, anaphylaxis, and death

Documented harms (all of those side effects are documented in this context) and so far at best inconclusive evidence based on small studies of questionable quality

Obviously there is a need to explore novel treatments in some areas but don’t endorse using autistic children to play pincushion because you’re not aware of the very real, documented, and potentially dire risks