The purpose of this study is verify the safety and efficacy of Human Umbilical Cord Mesenchymal Stem Cells (UC-MSC) therapy for patients with Spinocerebellar Ataxia, and in addition, explore the possible mechanisms of UC-MSC therapy in Spinocerebellar Ataxia.
Clinical and genomic test diagnoses as spinocerebellar ataxias (SCA) (include SCA 1, SCA 2, SCA 3, SCA 6), SARA (Scale for Assessment and Rating of Ataxia) score is 2-5, can complete 8-meter walking test（8MW）
Do not receive stem cells treatment in 6 months
Participants sign the consent form based on the experiment process and statement
Cardiac, renal, hepatic insufficiency; total bilirubin is 1.5 times higher than normal value, aspartate transaminase（AST）or alanine aminotransferase（ALT）is 2.5 times higher than normal value
Hemogram: total white blood cells <3.0 * 10^9 cells/L, blood platelet <75 * 10^9/L, hemoglobin <100g/L
pneumonia, or severe infection
With severe allergic history