Treatment and clinical outcomes of 30 patients who relapsed after allogeneic hematopoietic cell transplantation for myelodysplastic syndrome. Abbreviations: AML, acute myeloid leukemia; BSC, best supportive care; CR, complete remission; DLI, donor lymphocyte infusion; HCT, hematopoietic cell transplantation; HMA, hypomethylating agent; LDAC, low-dose cytarabine; SD, stable disease; TRM, treatment-related mortality.