Recurrence and Outcomes of Lupus Nephritis After Renal Transplantation: Analysis of Nine Cases and Review of the Literature

<b>Background and Objectives:</b> Recurrence of lupus nephritis (LN) after kidney transplantation is a major clinical concern in patients with systemic lupus erythematosus (SLE) who progress to end-stage renal disease (ESRD). Reported rates of post-transplant LN recurrence vary widely and are influenced by patient characteristics, immunosuppressive regimens, and indications for allograft biopsy. <b>Patients and Methods:</b> Medical records of adult LN patients treated at the University Hospital in Kraków, Poland, during the years 2012-2022 were retrospectively reviewed to identify individuals who progressed to ESRD and received a kidney transplant. Data collected included patient demographics as well as clinical, laboratory, transplant-related, and dialysis-related information. <b>Results:</b> Among 1039 patients with SLE, LN was diagnosed in 351 (33.8%), and 28 (8.0%) progressed to ESRD, of whom n = 9 (32.1%) underwent kidney transplantation. All patients received deceased-donor grafts, with a median time from ESRD to transplantation of 3 years (range 1-8) and a median post-transplant follow-up of 6 years (3-20). Maintenance immunosuppression consisted predominantly of glucocorticosteroids, mycophenolate mofetil, and tacrolimus in 77.8% of patients, with basiliximab induction was used in 2 of 2 patients with available data. Biopsy-proven LN recurrence occurred in 22.2% (2/9) of recipients. Graft loss was observed in 22.2% (2/9), while overall mortality reached 33.3% (3/9), including one peri-transplant death and one death due to infectious complications. Hematological manifestations were present in 100% of patients, hypercholesterolemia in 100%, and arterial hypertension in 88.9%, while anti-dsDNA antibodies were detected in 77.8%. LN relapse occurred despite standard immunosuppressive therapy and in the absence of consistent clinical or immunological predictors. <b>Conclusions:</b> LN recurrence occurred in 2 of 9 patients (22.2%). Patients with LN after kidney transplantation require careful long-term monitoring and individualized immunosuppressive management, considering baseline risk profile and relevant clinical with immunological factors.