A Pilot Study of Darzalex Faspro (Daratumumab and Hyaluronidase-fihj) Before Standard Desensitization and Allogeneic Peripheral Blood Stem Cell Transplantation in Adult Patients at High-risk for Primary Graft Failure Secondary to Donor Specific Antibodies
This research is being done to investigate the safety and effectiveness of Darzalex Faspro (daratumumab and hyaluronidase-fihj) (a monoclonal antibody that targets plasma cells that make antibodies) and whether it can lower donor specific antibodies (DSA) levels to low enough levels to permit patients to proceed with allogeneic peripheral blood transplant (alloBMT). Those being asked to participate have high DSA levels that puts those being asked to participate at high risk of rejecting the available donor's blood stem cells and making those being asked to participate ineligible to receive a stem cell transplant.
• Participates must meet all other institutional criteria for the planned reduced intensity conditioning allogeneic peripheral blood stem cell transplant (RIC alloHSCT) as defined in Johns Hopkins BMT Policy; all potential non-cord blood donor sources are included: matched related, haploidentical, matched unrelated, mismatched unrelated.
• Participants must be ≥18 years of age.
• Participants must have adequate organ function for undergoing RIC allogeneic peripheral blood stem cell transplant, and for undergoing a clinical trial.
• a. Hematologic. i. White blood cell (WBC). ANC ≥ 500/mm3 (growth factor support allowed). ii. Hemoglobin. No specific cut-off. (PRBC transfusion allowed). iii. Platelets. Platelets ≥ 10,000/mm3 (platelet transfusion allowed). b. Liver. Bilirubin ≤ 3.0 mg/dL (unless due to Gilbert's syndrome or hemolysis), and Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST) \< 5x Upper limit of normal (ULN) c. Renal. Serum creatinine ≤ 2.0 mg/dL. d. Cardiac. Left ventricular ejection fraction ≥ 35%. e. Pulmonary. FEV1 ≥ 50%.
• Subjects are eligible if there are high levels of Donor Specific Antibody levels based on protocol specific scoring system regardless of prior attempts at standard desensitization.
• Participants must have a no other readily available suitable alternative donor.
• All potential Participants must be pre-approved by BMT faculty consensus.
• Participants must have adequate willingness to participate in a clinical trial.