Safety and Efficacy of the Bispecific T-Cell Engager (BiTE) as Conditioning Regimen for ABO-incompatible Living Donor Kidney Transplantation

Inclusion Criteria:

1. Age ≥18 years old and ≤65 years old, regardless of gender
2. End-stage renal disease (ESRD) diagnosed clinically and pathologically, estimated glomerular filtration rate (eGFR) <15 mL/min/1.73m², or undergoing maintenance dialysis (hemodialysis or peritoneal dialysis) for ≥3 months
3. Plan to receive ABO-incompatible living donor kidney transplantation (ABOi-LDKT), and the matching has been approved by the organ transplantation ethics committee and technical committee of the hospital
4. Pre-existing anti-donor ABO blood group antibody titer (IgG+IgM) ≥1:16 (determined by standard tube method or microcolumn gel method)
5. able to understand study procedures, provide written informed consent, and be willing and able to comply with the study visit schedule and laboratory examination requirements

Exclusion Criteria:

1. patients allergic to the components of rituximab, teritumumab and berintuomab;
2. Hematologic diseases or myelosuppression (ANC < 1.0×10⁹/L, PLT < 75×10⁹/L);
3. multi-organ recipients, such as patients undergoing or having bone marrow transplantation or other organ transplantation at the same time;
4. acute active infection (including HBV, HCV, HIV, uncontrolled bacterial/fungal infection);
5. Severe cardiac dysfunction (NYHA class III-IV)
6. known or suspected hereditary complement deficiency
7. abnormal liver function: aspartate aminotransferase (AST) or alanine aminotransferase (ALT) or glutamyl transpeptidase (GGT) > 3 times the upper limit of normal (ULN); Or alkaline phosphatase (ALP) or total bilirubin values greater than 1.5 times the upper limit of normal (ULN).
8. Central nervous system diseases: epilepsy, psychosis, organic encephalopathy syndrome, cerebrovascular accident, encephalitis or central nervous system vasculitis, visual impairment, cranial neuropathy requiring intervention, etc.
9. complicated with other uncontrolled malignant tumors;
10. women who are pregnant, breastfeeding or planning to become pregnant;
11. patients with poor compliance before and after surgery, or unable to cooperate with treatment and research due to other mental diseases;
12. Patients who were not eligible for the study for other reasons according to the investigator's judgment.