MO971LYMPHOPROLIFERATIVE DISEASE AFTER KIDNEY TRANSPLANTATION: DESCRIBING OUR EXPERIENCE

Abstract

Abstract Background and Aims Post-transplant lymphoproliferative disorders (PTLD) are one of the most common malignancies in kidney transplant (KT) recipients. Immunosuppressive therapy and Epstein Barr Virus (EBV) play a main role in their pathogenesis. Method In this study we retrospectively analyze the characteristics, clinical evolution and treatments of a group of KT recipients performed between 1986 and 2020 in a single center. Results We included 31 patients (64.5% males). Polycystic kidney disease was the most frequent cause of renal failure. Before KT a 6.5% of the patients presented another malignancy, 10% were EBV seronegative and one received immunosuppressive therapy secondary to his primary disease. Mean age at KT was 43±12 years. 68% of the KT came from brain-dead donors. The most frequent immunosuppressive regime consisted in tacrolimus, mycophenolic acid and prednisone (61.3%). Basiliximab and Timoglobulin were used in the same proportion for the induction therapy (22.6%). Before PTLD appearance the immunosuppressive therapy was reduced in the 54.8% of the recipients. 13% of them presented acute allograft rejection. The majority of PTLD were diagnosticated between 2016 and 2020. Median time to develop PTLD was 13 years. 54.3% of the patients presented with extranodal involvement. Although all the patients positivized EBV serology, 60% of them had undetectable EBV viral load. The main therapeutical strategy after PTLD consisted in a reduction of the immunosuppressive therapy. In this way, 28.6% of the recipients was treated with monotherapy with a calcineurin inhibitors and 21.5% with monotherapy with a mTOR inhibitor. In other hand 16.7% received a combination of tacrolimus with a mTOR inhibitor. Rejections were not observed in our group and all the patients presented a preserved kidney function at the end of follow up. Four recipients died because of PTLD. The remaining 27 presented a complete response or stabilization of the disease. Conclusion Most of the PTLD were detected between 2016-2020. The time from transplantation to PTLD appearance was long, being EBV viral load negative in the majority of the cases. Graft survival after chemotherapy and reduction of immunosuppressive therapy was excellent, with a low risk of rejection and a good prognosis for hematologic disease. It is possible that a reduction in immunosuppression in selected patients could prevent the development of PTLD.