Increase of allosensitization after a kidney graft failure: Predictors and effect on retransplantation outcomes.

Patients who are candidates for a second kidney transplant (SKT) frequently have a higher level of panel reactive antibodies (PRA). We assessed the allosensitisation change after a first graft failure (GF), its predictors and impact on retransplantat outcomes. We retrospectively selected 140 adult patients who received a SKT. Recipient and donor characteristics were analyzed. We defined the delta PRA (dPRA) as the difference between peak PRA before the SKT and first one (cohort median value=+10%). Logistic regression analysis was used to determine risk factors for dPRA≥10% and acute rejection (AR) in the SKT. Univariable and multivariable Cox analysis was applied to assess independent predictors of second GF. Risk factors for dPRA≥10% at SKT were AR (OR=2.57; P=0.022), first graft survival <1 year (OR=2.47; P=0.030) and ABDR HLA mismatch (OR=1.38 per each mismatch; P=0.038). AR in the SKT was associated with dPRA≥10% (OR=2.79; P=0.047). Induction with a lymphocyte-depleting agent had a protective effect (OR=0.23; P=0.010). SKT survival was lower (P=0.008) in patients with a dPRA≥10% (75.6%, 60.5% in dPRA≥10%; 88.6%, 88.6% in dPRA<10% patients at 5 and 10 years, post-transplant respectively). Multivariable Cox regression showed that dPRA≥10% (HR=2.38, P=0.042), delayed graft function (HR=2.82, P=0.006) and AR (HR=3.30, P=0.001) in the SKT were independent predictors of retransplant failure. This study shows that an increased allosensitisation at retransplant was associated with the degree of HLA mismatch and led to poorer outcomes. De-emphasis of HLA matching in current allocation policies may be undesirable, particularly in patients with a higher chance of needing a SKT.

A case series of de novo inflammatory bowel disease after kidney transplantation.

Diarrhea, which is common after transplantation, may be due to infections and immunosuppressive therapy. Inflammatory bowel disease (IBD) de novo or as an exacerbation of pre-existent disease is a rare complication after kidney transplantation with pre-existing disease having a less aggressive clinical course than the de novo disease. Cytomegalovirus mismatch, prescription of tacrolimus instead of cyclosporine or mycophenolate mofetil rather than azathioprine as well as low-dose corticosteroid treatments have been linked to an increased incidence of IBD. This series of renal transplant recipients with de novo IBD showed a higher incidence and more aggressive course than that previously described, possibly related to increased use of tacrolimus with minimization of steroids.

Nineteen years of experience utilizing anti-T-Lymphocyte globulin induction in pediatric kidney transplantation.

BACKGROUND: The optimal immunosuppressive therapy in kidney transplantation remains controversial. Since 1990, we included, in our department, anti-T-Lymphocyte globulin Fresenius® (ATG-F) in a sequential immunosuppressive therapy in pediatric recipients of deceased donor kidneys. We analysed retrospectively the complications and long-term outcomes. MATERIAL/METHODS: Ninety eight kidney transplants were performed in 91 children and adolescents between November 1990 and October 2009, using deceased donor source grafts. In 86.8% of the recipients ATG-F was used as antibody induction and in 12.2% of the recipients no ATG-F induction was used. RESULTS: Overall graft survival rates at 1, 5, 10 and 15 years were 91.8%, 86.1%, 75.9% and 61.9% respectively. In the ATG-F group the graft survival at 1, 5, 10 and 15 years was 93%, 89.1%, 79%, 62.4% and in group without ATG-F it was 83.3%, 66.7%, 55.6% at 1, 5, 10 years respectively (p=0.27). The overall incidence of infection was 1.6/patient in the first year post-transplantation and almost all were of mild or moderate intensity. A papillary thyroid carcinoma was diagnosed in one patient and no lymphoid malignancies were observed during the observational period. All patients were alive at the end of follow-up, except one who died of cardiovascular disease, 7 months after graft loss. CONCLUSIONS: These results indicate that ATG-F induction in pediatric kidney transplantation using deceased donor kidneys is associated with good graft and patient survival rates, and with low levels of complications.