Management of Tumor Necrosis Factor α Inhibitor Therapy After Renal Transplantation: A Comparative Analysis and Associated Outcomes.

Background: Biologic agents inhibiting the tumor necrosis factor α pathway (TNFα-Is) are used to treat systemic inflammatory diseases. The best management of these agents after renal transplantation is unknown.

Objective: Evaluate peritransplant use of TNFα-Is and associated outcomes.

Methods: Retrospective, single-center study of adult renal-transplant-recipients (RTRs) transplanted between 1/1/1998-12/31/2017, who received TNFα-Is for inflammatory disease prior to transplant. Qualifying patients were divided into 2 cohorts: patients who resumed TNFα-Is after transplant and those who did not. Outcomes were evaluated.

Results: A total of 5256 renal transplants occurred in the study window; 14 patients met inclusion criteria. Primary indication for TNFα-I was Crohn's-disease (CD; 57.1%). Infliximab was utilized most frequently (50%). Seven RTRs resumed TNFα-I posttransplant; mean time to resumption of 10.6±4.35 months (median=6 months), 85.7% for CD. Immunosuppression was modified in 2 patients (28.6%) in response to restarting TNFα-I therapy. Seven RTRs did not resume TNFα-Is following transplant; the majority of these had rheumatic diseases. There was no significant difference in time to first bacterial or fungal infection, rejection, or patient survival between the 2 groups. Last measured estimated glomerular-filtration-rate was similar between groups (TNFα-I: 41 ± 14.2 vs 48.6 ± 8.6, P = 0.25). No patient had cytomegalovirus infection; however, 42.8% of each cohort had documented BK virus infection. Malignancy occurred more frequently in the cohort that resumed TNFα-Is (42.8% vs 14.3%, P = 0.24); however, this was not statistically significant. Conclusion and Relevance: TNFα-I therapy prior to renal-transplant is relatively uncommon. The decision to continue therapy after transplant must balance risks of infection and malignancy against inflammatory disease recurrence. A multidisciplinary treatment approach is necessary as use of TNFα-I affects immunosuppressive management and appears to affect transplant outcomes. Future studies are needed to further clarify the role of TNFα-I therapy use in RTRs with inflammatory disorders focusing on its correlation with both BK and malignancy.