In VivoEffects of Porcine and Rabbit Antithymocyte Globulin in Patients with Severe Aplastic Anemia

Background:Severeaplastic anemia (SAA) is a bone marrow failure disorder mediated by T lymphocytes, resulting in severe deficiency of hematopoietic stem cells. Horse antithymocyte globulin (H-ATG) plus cyclosporin was the first-line therapy for SAA patients in the absence of an HLA-matched sibling 1. The inhibitory effect of Rabbit-ATG (R-ATG) on lymphocytes is more deeply than that of H-ATG, and the recovery of CD4 T cells is slower, resulting in poor efficacy in SAA patients 2. Porcine ATG (P-ATG) and R-ATG are two available immunosuppressive choices in China mainland, the first-line formulation of ATG remains unknown.