Desensitization Strategies for Highly Sensitized Kidney Transplant Candidates with High-Titer Donor-Specific Antibodies: A Clinical Consensus and Evidence Review Highly sensitized kidney transplant candidates, characterized by elevated calculated panel reactive antibody (cPRA) and high-titer donor-specific antibodies (DSA), face significant barriers to transplantation. This paper synthesizes expert clinical practice and current evidence regarding desensitization protocols for such challenging cases. Utilizing a community peer-reviewed clinical Q&A platform (tachyDx), expert opinions from two verified physicians, supported by 71 community votes, were analyzed to address critical questions concerning desensitization protocols for mean fluorescence intensity (MFI) >10,000, the role of imlifidase, and acceptable MFI thresholds for transplantation.
**Background:** Highly sensitized kidney transplant candidates, often with a history of failed transplants, experience prolonged wait times and increased risk of antibody-mediated rejection (AMR). Effective desensitization protocols are crucial for expanding transplant access in this population.
**Methods:** A clinical scenario involving a 34-year-old female with ESRD, cPRA 98%, and multiple high-titer DSAs (MFI up to 14,500) against a potential living donor was presented on the tachyDx platform. Two board-certified nephrology and transplant medicine specialists provided detailed responses, which were then peer-voted by 71 community physicians. This paper formally synthesizes these expert recommendations and integrates them with established medical literature.
**Results:** A modified Johns Hopkins desensitization protocol, incorporating bortezomib, dexamethasone, plasmapheresis, IVIG, and rituximab, was proposed for MFI >10,000, demonstrating a 4/6 success rate in achieving transplantable MFI levels. Imlifidase (IdeS) was identified as a transformative rescue strategy, capable of rapidly cleaving IgG antibodies, with reported conversion rates to negative crossmatch exceeding 90% in clinical trials. Critical MFI thresholds for acceptable risk were defined as <5,000 for Class I and <3,000 for Class II DSA (particularly DQ), coupled with negative flow cytometry and C1q binding assays. DQ antibodies were highlighted as a significant concern due to their strong association with AMR.
**Conclusions:** Effective management of highly sensitized kidney transplant candidates requires multi-agent desensitization strategies, judicious use of novel agents like imlifidase, and stringent MFI thresholds. Individualized protocols and close post-transplant monitoring are essential to mitigate the risk of AMR and improve graft outcomes in this complex patient population.
nephrology immunology pharmacology