Influence of hepatic Graft-Versus-Host-Disease (GVHD) on the pharmacokinetics of ciclosporin in a case of acute myeloid leukemia treated at the EHU Oran

Acute myeloid leukemia (AML) is a malignant blood disease that affects hematopoietic cells in the bone marrow. The best treatment for AML is allogeneic hematopoietic stem cell transplantation (HSC). To prevent and treat the main complication of allogeneic marrow transplant, graft versus host disease (GVHD), it is necessary to combine immunosuppressive therapy which includes ciclosporin (CsA). The objective of our work is to study the influence of hepatic GVHD on the pharmacokinetics of cyclosporin in an AMLcase. This is an allografted patient (CSH), presented to our Pharmacovigilance department at the EHU of Oran in Algeria, with the aim of carrying out therapeutic pharmacological monitoring (TPM) of ciclosporin. We proceeded to assay for residual ciclosporinaemia from D1 of the allogeneic transplant. The patient presented a fluctuation of the trough concentrations, the explanation of which was an onset of acute hepatic GVHD, confirmed by biopsy with an elevated hepatic function, which represents an incidence varying between 10 and 50% in patients receiving transplant from a genoidentical donor. Without forgetting the great inter-individual and intra-individual variability of the response to ciclosporin, the environmental and pathological factors and the numerous drug interactions which can be the cause of modification of the pharmacokinetics and the pharmacodynamics of this drug. In conclusion, the pharmacological monitoring of cyclosporin, which is the treatment of choice to prevent or treat GVHD, is mandatory due to its low therapeutic index and high inter- and intra-individual variability.