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Background: Focal segmental glomerulosclerosis (FSGS) is a common cause of end-stage kidney disease requiring kidney transplantation and can recur in the allograft in 30-80% of recipients resulting in reduced graft survival. Plasmapheresis has shown efficacy in treating some cases of recurrent FSGS but isolated plasmapheresis has not demonstrated efficacy in preventing recurrent FSGS. Rituximab has had anecdotal success in preventing recurrence in a single center study but has not been studied in combination with plasmapheresis for preventing FSGS recurrence., Methods: We are conducting a randomized, controlled, multicenter clinical trial of adult and pediatric kidney transplant recipients with primary FSGS to assess whether plasmapheresis in combination with rituximab prevents recurrent disease post-transplantation., Discussion: Rituximab combined with plasmapheresis is a promising, novel therapy to prevent recurrent FSGS, a disease with limited therapeutic options and no consensus guidelines for prevention or treatment., Clinical Trial Registration: https://clinicaltrials.gov/ct2/show/NCT03763643, identifier NCT03763643., Competing Interests: Author MR is a site PI for unrelated clinical trials funded by Chinook, Kaneka, Travere, Reata, Sanofi and a consultant for Visterra. Author PV is a site PI for unrelated clinical trials funded by Akebia, Allosure, Otsuka, Pharmacosmos and Viracor and a consultant for NS Pharma. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Rheault, Amaral, Bock, Chambers, Chavers, Ters, Garro, Gbadegesin, Govil, Harshman, Amer, Hooper, Israni, Riad, Sageshima, Shapiro, Seifert, Smith, Sung, Thomas, Wang and Verghese.)