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The meaning of borderline rejection in kidney transplantation. Borderline T cell-mediated rejection is a diagnostic category of the Banff schema that uses a lower diagnostic threshold. Subclinical borderline T cell-mediated rejection detected by surveillance sampling is not entirely benign. Studies demonstrate increased rates of late rejection, progressive nephron loss, functional impairment, donor-specific antibody formation, and allograft failure. It can be conceptualized as a failure to control the cellular alloimmune response. Mixed results are reported for its treatment, and randomized controlled trials are needed.