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• W1975460173 abstract "The care and management of renal transplant recipients, and especially of pediatric renal transplant recipients, is potentially complex and exacting. Balancing the amount of immunosuppression to prevent toxicity and to avoid rejection is not always straightforward. In addition, the specific needs of pediatric patients add another layer of complexity to their care. A reasonable question is whether routine protocol kidney biopsies (by definition, in patients with stable renal function) will help to optimize the management of pediatric kidney recipients, and whether the benefits justify making them the standard of care for all pediatric kidney recipients. I would argue that they do not, and that protocol biopsies should not yet be performed routinely in all patients.There is no question that obtaining renal allograft biopsies to evaluate renal dysfunction is essentially mandatory. Without a biopsy to establish the diagnosis, any therapeutic intervention is a poorly educated guess. However, the use of invasive biopsies to evaluate all children with stable renal function is another matter. It is certainly possible, even likely, that such biopsies, preferably in combination with mechanistic studies of immunologic reactivity, represent important research tools. They can reveal whether important subclinical events are occurring that can impact on long-term patient and graft survival. Such studies should be performed in selected centers with the manpower and expertise to perform protocol biopsies safely and routinely. It is even reasonable for a given center to consider them as its standard of care. At issue is whether the results from studies that have performed protocol biopsies justify their expansion to every pediatric kidney transplant program.There is a fairly substantial literature on protocol biopsies in adult renal transplant recipients, and a smaller literature on pediatric recipients. These studies show a variable incidence of subclinical acute rejection, ranging from 2.6–100%, with many reports in the 25–30% range (1–18). There is also a literature demonstrating an incidence of subclinical chronic allograft nephropathy (CAN) (6, 8, 10, 13, 14, 17–25), and a suggestion that the presence of CAN with vasculopathy is a poor prognostic factor for long-term outcome (8). However, the important issue in protocol biopsies is whether performing them will lead to management changes that will improve long-term graft survival and function. The only randomized trial that has demonstrated a benefit to diagnosing and treating subclinical acute rejection is the adult Winnipeg experience and, while it is persuasive, it is a relatively small, single center experience (3–6). The pediatric protocol biopsy experience from Winnipeg, which was not randomized, was associated with excellent three-yr graft survival and renal function, but was associated with an incidence of CAN of 86%, despite the aggressive treatment of subclinical rejection (26).While the risks of protocol biopsies are low, they are not zero. Substantial morbidity, and even mortality, has been associated with kidney transplant biopsies; fortunately, these catastrophic complications are rare (12, 27). In patients with an indication for a biopsy, the low risk is justified by the benefit of knowing the cause of the renal dysfunction. In a protocol biopsy setting, it is a reasonable question to ask whether the risk is justified. By making protocol biopsies the standard of care in all programs, there is an increased risk of a serious biopsy-related adverse event, especially in centers without the infrastructure and expertise to perform biopsies routinely and safely. There is additionally the issue of who will pay for the increased number of biopsies.While protocol biopsies may be useful in centers where there is sufficient expertise to perform them and ideally where concomitant immunologic studies can be performed, it is not clear that there is enough benefit to expand their use to every pediatric transplantation program. It would certainly be worth considering a large, multicenter randomized trial of protocol biopsies in pediatric kidney transplant recipients, along the lines of the Winnipeg trial, to see if there would be a demonstrated benefit, in terms of graft survival and function. This would be a worthwhile project for either the International Pediatric Transplantation Association (IPTA) or North American Pediatric Renal Transplant Cooperative Study (NAPRTCS) to consider, and would provide a real answer to this question." @default.
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• W1975460173 title "Protocol biopsies should not (yet) be the standard of care in pediatric renal transplant recipients" @default.
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