A Study of Mesenchymal Stem Cell in the Treatment of Autism Spectrum Disorder

Inclusion Criteria: * Male or female ≥6 years old * Body weight ≥ 17 kg * Meets the diagnostic criteria for Autism Spectrum Disorder (ASD) as defined by the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), and confirmed by the Autism Diagnostic Interview-Revised (ADI-R) and the Autism Diagnostic Observation Schedule-2 (ADOS-2) * Has either not received any psychotropic medication in the three months prior to enrollment or has been on a stable regimen of psychotropic medication for at least three months * The subject and/or their legal guardian(s) agree to participate in the trial and provide signed informed consent. Exclusion Criteria: * Inability of the subject or their guardian to sufficiently understand instructions in Chinese * Active infection (viral, bacterial, fungal, or mycobacterial) * A confirmed diagnosis of Rett syndrome, childhood disintegrative disorder, fragile X syndrome, or other genetic/metabolic diseases that may impact cognitive development * History of epileptic seizures within 6 months prior to enrollment * History of suicide attempts/self-harm, presentation of suicidal ideation, or being judged as the risk of suicidal by the investigator * Severe hematologic diseases or active malignancy * Severe hepatic or renal disease * Participation in a drug clinical trial within 3 months prior to enrollment (unless beyond the protocol-defined wash-out period) or participation in any other stem cell study within the past year * A positive skin test result * Any other condition which, in the opinion of the investigator, would make the subject unsuitable for participation in this study