Mesenchymal Stem Cells in the Treatment of Refractory Primary Immune Thrombocytopenia

The overall test process is as follows: screening period (V1): sign ICF, check the screening period, judge the criteria, record the baseline demographic information and the status of the subjects. Baseline period (V2): pre-transfusion assessment was performed to record the safety and other examinations of the subjects. During the treatment period (V3): according to the method and dose specified in the scheme, MSCs was treated for 5 times. Follow up period (V5): Safety and efficacy follow-up will be conducted at D14, M1, M2, M3, M6, M9, and M12 during the follow-up period.The subjects were followed up to M12 or those who met the withdrawal criteria withdrew early, whichever occurred first.