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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The clinical and pathological significance of borderline T cell-mediated rejection.
American Journal of Transplantation 2019 May
The pathological diagnosis of borderline rejection (BL-R) denotes possible T cell-mediated rejection (TCMR), but its clinical significance is uncertain. This single-center, cross-sectional cohort study compared the functional and histological outcomes of consecutive BL-R diagnoses (n = 146) against normal controls (n = 826) and acute TCMR (n = 55) from 551 renal transplant recipients. BL-R was associated with the following: contemporaneous renal dysfunction, acute tubular necrosis, and chronic tubular atrophy (P < .001); progressive tubular injury with fibrosis by longitudinal sequential histology (45.3% at 1 year); increased subsequent acute rejection (39.4%), allograft failure (P < .001), and patient mortality (P = .007). BL-R detected by biopsy indicated for impaired function was followed by suboptimal functional recovery (46.3%), persistent inflammation (27.2%), and acute rejection episodes (50.0%) despite antirejection treatment in 83.3%. By 1 year after BL-R, the incidence of new-onset microvascular inflammation (9.3%), C4d staining (22.3%), transplant glomerulopathy (13.3%), and de novo donor-specific antibodies (31.5%) exceeded normal controls (P < .05-.001). BL-R inflammation in protocol biopsy persisted in 28.0% and progressed to acute rejection in 32.6%; however, it resolved in 61.6% of the untreated cases. In summary, BL-R is a heterogeneous diagnostic grouping, ranging from mild inconsequential inflammation to clinically significant TCMR, which is capable of immune-mediated tubular injury resulting in inferior functional, immunological, and histological consequences.
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