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Background: Adult kidney transplant recipients (KTRs) fully vaccinated against COVID‐19 have substantial morbidity and mortality related to SARS‐CoV‐2 infection compared with the general population. However, little is known regarding the safety and efficacy of the COVID‐19 vaccination series in pediatric KTRs. Methods: A multicenter, retrospective observational study was performed across nine pediatric transplantation centers. Eligible KTRs fully vaccinated against COVID‐19 were enrolled and data were collected pertaining to SARS‐CoV‐2 infection incidence and severity, graft outcomes and post‐vaccination safety profile, as well as overall patient survival. Results: A total of 247 patients were included in this investigation with a median age at transplantation of 11 years (IQR 5–15). SARS‐CoV‐2 infection was observed in 30/110 (27.27%) of fully vaccinated patients, tested post‐transplant, within the defined follow‐up period. Of these patients, 6/30 (18.18%) required hospitalization and 3/30 (12.12%) required reduction in immunosuppression, with no reported deaths. De novo donor‐specific antibodies (DSAs) were found in 8/86 (9.30%) of DSA‐tested patients with two experiencing rejection and subsequent graft loss. The overall incidence of rejection and graft loss among the total cohort was 11/247 (4.45%) and 6/247 (3.64%), respectively. A 100% patient survival was observed. Conclusions: Observationally, infectious outcomes of SARS‐CoV‐2 in fully vaccinated pediatric KTRs are excellent, with a low incidence of infection requiring hospitalization and no associated deaths. Though de novo DSAs were observed, there was minimal graft rejection and graft loss reported in the total cohort. [ABSTRACT FROM AUTHOR]

Background: Cytomegalovirus (CMV) is a significant cause of morbidity among immunocompromised patients who have undergone kidney transplantation and is known to rarely induce collapsing focal segmental glomerulosclerosis (FSGS) among adults. Methods: We present the first reported case of CMV‐induced collapsing FSGS in a pediatric patient after kidney transplant. Results: Our patient underwent a deceased donor kidney transplant due to end‐stage renal disease secondary to lupus nephritis. Approximately 4 months after transplantation, he developed signs of worsening kidney function in the setting of CMV viremia and was found to have collapsing features of FSGS on kidney transplant biopsy. He was managed with a prompt escalation of antiviral therapy along with a reduction of immunosuppression and recovered without significant complication. At follow‐up, he continued to have undetectable CMV titers, creatinine within normal limits, and no significant proteinuria. Conclusion: This report demonstrates CMV as a cause of collapsing FSGS and should be considered among pediatric transplant recipients who present with acute kidney injury, as should early assessment of APOL1 genetic status in both donor and recipient. [ABSTRACT FROM AUTHOR]

Background: Focal segmental glomerulosclerosis (FSGS) predisposes patients for risk of recurrent disease in allografts. Methods: We report a case of a recipient of an unrelated living donor renal transplant and discuss considerations for utilization of ofatumumab and eplerenone in treatment for recurrent FSGS. Results: The recipient was initially managed with scheduled plasmapheresis, intravenous immunoglobulin (IVIG), and rituximab post‐transplant during index hospitalization. With notable recurrence of FSGS noted on kidney transplant biopsy, she was initially treated with additional plasmapheresis sessions leading to downtrend in proteinuria. The patient was then transitioned to LDL‐A pheresis, which resulted again in uptrend in proteinuria. This prompted return to scheduled plasmapheresis sessions weekly, leading again to a downtrend in proteinuria. Albumin levels remained within normal range throughout her course. Following initiation of eplerenone and ofatumumab, the patient demonstrated normalization of urine protein:creatinine ratio and remission of FSGS recurrence without need for additional apheresis. Conclusions: With notable risk of recurrence of FSGS in kidney transplants leading to allograft failure, the use of ofatumumab and eplerenone in conjunction should be considered for management to induce remission. [ABSTRACT FROM AUTHOR]

Introduction: Recurrent focal and segmental glomerulosclerosis (FSGS) in kidney transplant recipients is associated with lower graft survival and increased morbidity. There are limited data to guide the decision to re‐transplant patients with transplant failure due to FSGS recurrence. We aimed to evaluate outcomes in patients re‐transplanted after having initial graft failure due to recurrent FSGS and to study physician attitudes and practice patterns. Methods: Retrospective data from 10 centers were collected on 20 patients transplanted between January 1997 and September 2018. A survey was sent to nephrologist members of the Pediatric Nephrology Research Consortium. Results: Mean patient age (years) was 9.8 ± 4.8 at first transplant and 15.9 ± 4.9 at re‐transplantation. Pre‐transplant plasmapheresis was used in 1 (5.3%) primary transplant vs. 7 (38.9%) re‐transplants (p =.03). Nephrotic syndrome recurred in 14 patients (70%) after re‐transplantation and was severe in 21.1% vs. 64.7% after first transplant (p =.04). Graft survival was significantly higher in the second transplant (p.009) with 70% having functioning grafts at a median of 25.2 months. Thirty‐one physicians from 21 centers completed the survey, 94% indicated they would re‐transplant such patients, 44.4% preferred a minimum waiting period before re‐transplantation, 36.4% preferred living donors, and 22.2% indicated having protocols for re‐transplantation at their centers. Conclusions: Consideration for re‐transplantation is high among pediatric nephrologists. Pre‐transplant plasmapheresis was more frequent in re‐transplanted patients. Nephrotic syndrome recurrence was less severe, with better graft survival. More data and a larger population are necessary to further evaluate outcome determinants and best practices in this special population. [ABSTRACT FROM AUTHOR]

Background: Medullary sponge kidney (MSK) disease predisposes patients to recurrent nephrolithiasis, which affects one in every 5000 people in the United States. Methods: We report a rare case of a pediatric recipient of a living donor MSK transplant and discuss considerations when discussing risks and benefits of accepting MSK allografts for this population. Results: The recipient was admitted due to concerns for nephrolithiasis, hydronephrosis, and urinary tract infection at 1‐month post‐transplant. The hydronephrosis was resolved by surgical removal of an encrusted ureteral stent; this was followed by supplementation with oral medications to prevent future episodes of nephrolithiasis. The recipient did not have any further episodes after this as seen at a 1‐year follow‐up. The donor has remained well through this period. Conclusions: With increasing organ shortages, the use of variety of donors may need to be considered to enlarge the organ pool. [ABSTRACT FROM AUTHOR]

In 2005, the Banff committee expanded the "borderline changes" category to include lesions with minimal (<10%) inflammation: "i0" borderline infiltrates. Clinical significance and optimal treatment of i0 borderline infiltrates are not known. Data suggest that i0 borderline infiltrates may have a more favorable prognosis than borderline infiltrates with higher grades of interstitial inflammation. In this single‐center, retrospective, observational study, we assessed 90 renal transplant recipients with i0 borderline infiltrates on biopsies indicated for graft dysfunction. We studied the impact of treatment with corticosteroids on allograft function, allograft survival, and patient survival. We found no differences between treated and untreated groups with respect to eGFR at 4 weeks and 6 months after biopsy. Follow‐up biopsies, available in 67% of patients, were negative for rejection in almost half of all cases, regardless of treatment status. The frequencies of persistent borderline infiltrates (38%) and higher‐grade T cell–mediated rejection (1A or greater, 14%) on follow‐up biopsies were similar between the two groups. There were no differences in rejection‐free allograft survival, death‐censored graft failure, or patient mortality among treated vs non‐treated i0 borderline patients. Our findings suggest that the natural history of i0 borderline infiltrates, in relatively low immunologic risk patients, is not affected by corticosteroid treatment. [ABSTRACT FROM AUTHOR]

Although there is less experience with its use in children than adults, apheresis can be a life-saving treatment modality in certain pediatric diseases. With attention to specific technical aspects of the treatment, especially circuit volume, apheresis can be safely performed in children of any age or size. Even in pediatric diseases where it is recognized as an important part of therapy, apheresis is unfortunately still underutilized in North America and there needs to be increased awareness of its role and its availability within the pediatric community. Apheresis has been used particularly in children with certain renal diseases, notably ANCA-associated nephritis, anti-GBM disease, and atypical HUS. In addition, it can improve outcomes in transplantation of children with FSGS and can be part of a pre-transplant strategy for children who are highly sensitized and at high risk for graft failure. J. Clin. Apheresis 28:36-47, 2013. © 2013 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR]