P1693LONG-TERM OUTCOME OF KIDNEY TRANSPLANTATION IN PLASMA CELLS DYSCRASIAS

Background and Aims Survival of patients with Multiple Myeloma (MM), Light Chain Amyloidosis (LCA) and Monoclonal Gammopathies of renal significance (MGRS) on chronic renal replacement therapy (RRT) is poor. The gold standand treatment of plasma cell dyscrasias (PCD) is high-dose chemotherapy followed by Autologous Stem Cell Transplantation (ASCT) which can induce complete remission and longer survival than chemotherapy alone. Kidney transplantation (KT) after ASCT could represent an option for patients with PCD and End Stage Renal Disease (ESRD). There is no evidence about the time of follow up required from MM remission and KT. Method We present a case series of 5 patients who underwent KT after ASCT and remission of MM among 2,500 transplant recipients followed at the Nephrology Dialysis and Renal Transplantation Unit of S.Orsola University Hospital from 1967 untill now. As in case of recovery from solid cancers, the feasibility of KT after MM was considered when no signs of relapse were assessed. In our cohort 3 patients were affected by Light Chain Deposition Disease (LCDD), 1 patient presented Myeloma Cast Nephropathy (MCN) and one patient Light Chain Amyloidosis (LCA). They all required RRT and underwent KT after ASCT. Results Time between ASCT and KT ranged from 3 and 11 years and clinical outcome was very different. The mean follow up period ranged from 2 to 4 years. In the first case (LCDD) KT was performed 11 years after ASCT, the graft failure occurred 6 years later because of chronic allograft nephropathy requiring RRT. In the second case (LCDD) patient received KT 3 years after ASCT. He developed Bence-Jones proteinuria requiring specific therapy with Dexametasone and Bortezomib determining progressive graft failure. In the third case (LCDD) KT was performed 4 years after ASCT and the 4 year follow up is negative for relapse of MM or ESRD. The fourth patient presented MCN and received KT 8 years after ASCT. MCN relapsed 6 years later; it caused ESRD requiring RRT. In the last patient (LCA) KT was performed 4 years after ASCT. No recurrence occurred in a 2-year follow up. Conclusion MM is the most frequent malignancy in dialytic population; the need for KT in MM remains high. ASCT improves the quality of life and offers higher survival in patients with myeloma/MGRS/amyloidosis-related ESRD. Therefore the combination of chemotherapy/ASCT and KT is pivotal to pursue renal restoring. Since high risk of recurrence larger study are required to clarify the better follow up period after MM remission and KT.