IDH1 and thrombotic microangiopathy: To investigate the efficacy of Iptacopan in transplantation-associated thrombotic microangiopathy (TA-TMA) after allogeneic hematopoietic stem cell transplantation (allo-HSCT), we report the case of a 43-year-old male with Acute Myeloid Leukemia, Myelodysplasia-Related (AML-MR, with IDH1 and STAG2 mutations) who developed TA-TMA after allo-HSCT.