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Clinicopathological features and outcomes of kidney allografts in plasma cell-rich acute rejection: A case series.
Nephrology 2018 July
Plasma cell-rich acute rejection (PCAR) is a rare type of acute rejection in renal transplantation. Despite aggressive immunotherapy, approximately 40-60% of patients develop graft loss within 1 year after an episode of PCAR. However, the reason for this outcome remains obscure. This study retrospectively identified six patients with PCAR diagnosed between 2009 and 2015 at a single university hospital. Clinicopathological data were collected. Five of the six patients were male, and mean age at the onset of PCAR was 49.0 ±14.5 years. None of the patients showed overall poor adherence to medication. Mean time to diagnosis was 302 ±234 days post-transplantation. All patients had preceding or concurrent viral infection. Four patients developed PCAR alone and two patients developed PCAR with antibody-mediated rejection. One of the six patients showed both severe tubulointerstitial and microvascular inflammation (total of Banff tubulitis 't' + interstitial inflammation 'i' + glomerulitis 'g' + peritubular capillaritis 'ptc' scores >10). This patient had progressive worsening of graft function and re-initiated dialysis at 74 months after a PCAR episode. In addition, three of the six patients had long-term recurrence of PCAR. With the recurrence of PCAR, patients with both moderate tubulointerstitial and microvascular inflammation (total of Banff 't' + 'i' + 'g' + 'ptc' scores >6) had progressive worsening of graft function. In summary, the present results suggest that concurrent moderate to severe tubulointerstitial and microvascular inflammation may lead to poor outcomes of graft function after a PCAR episode.
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