The Safety and Efficacy Study of Avatrombopag Switch in TPO-RA Refractory AA

This study was a single-arm, multicenter, phase Π clinical study. Patients admitted to the enrollment unit center with a confirmed diagnosis of TDNSAA/VSAA/SAA, treated with IST (p/r-ATG+CSA) in combination with TPO-RA (including eltrombopta or hydtrombopta) for at least 3 months with no hematologic response at 6-month follow-up, and who were not suitable or unwilling to undergo hematopoietic stem cell transplantation (HSCT), were to another novel TPO-RA avatrombopta, 40-60 mg (weight \<80 kg), in addition to maintaining the original immunosuppressive therapy ( CSA or equivalent immune potency drugs), switch to another new TPO-RA avatropa 40-60 mg (40 mg daily for weight \<80 kg; 60 mg daily for weight \>80 kg) orally once daily for at least 3 months and follow up for 3 months to determine the hematologic response and to assess the safety of the drug.Selection of study population Severe aplastic anemia patients with poor efficacy of IST combined with TPO-RA Patients should be judged for inclusion and exclusion criteria. Number of subjects: 35 effective cases, 39 patients should be included according to the dropout rate of 10%.