Antithymocyte Globulin Treatment for Chronic Lung Allograft Dysfunction in Lung Transplant Recipients: Experience From a National Reference Transplant Center.

BACKGROUND: Chronic lung allograft dysfunction (CLAD) is the leading cause of mortality after the first year of transplantation and treatments can have little impact on CLAD progression in some cases. The objective of this study was to evaluate the effectiveness and safety of antithymocyte globulin (ATG) in lung transplant recipients with CLAD. METHODS: We reviewed all patients from our center that had undergone a lung transplant between 2008 and 2019 and selected those with CLAD who were treated with ATG. The closest lung function (forced expiratory volume in the first second) to the ATG administration was recorded, as well as the values 3, 6, and 12 months before and after treatment. We followed and recorded survival during the 12 months after treatment. RESULTS: A total of 13 patients with CLAD received ATG treatment. A favorable positive response to treatment (improvement or stabilization on lung function) was achieved in half of the patients. Most patients (71%) who responded well to ATG were in CLAD stage 1 to 2. The fall slope of forced expiratory volume in the first second is better after treatment. The median survival was 27 months, and we found a trend toward better survival in early CLAD stages 1 to 2. There were also differences in survival between rapid decliners and nonrapid decliners. CONCLUSIONS: ATG treatment could play a role in patient with CLAD who do not respond to conventional therapies. The effect of cytolytic therapy with ATG is clearly better in those patients in early stages, with little effect in those in CLAD stage 3.

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