for people ages 18-65 (full criteria)
at UC Davis UCLA
study started
estimated completion



This study will compare the safety and efficacy between patients receiving an engineered donor graft ("Orca-T", a T-cell-Depleted Graft With Additional Infusion of Conventional T Cells and Regulatory T Cells) or standard-of-care (SOC) control in participants undergoing myeloablative allogeneic hematopoietic cell transplant transplantation (MA-alloHCT) for hematologic malignancies. This posting represents the Phase III component of Precision-T. The Precision-T Ph1b component is described under NCT04013685.

Official Title

A Randomized Phase III Trial for Patients With Advanced Hematologic Malignancies Undergoing Allogeneic Hematopoietic Cell Transplantation With Either Orca-T, a T-cell-Depleted Graft With Additional Infusion of Conventional T Cells and Regulatory T Cells, or Standard-of-Care Allogeneic Graft


Cross reference NCT04013685


Acute Myeloid Leukemia Acute Lymphoid Leukemia Mixed Phenotype Acute Leukemia Undifferentiated Leukemia High-risk Myelodysplastic Syndrome Acute Leukemia Therapy-Related Myelodysplastic Syndrome hematopoietic stem cell transplantation Myelodysplastic syndromes matched related donor matched unrelated donor myelodysplastic syndrome Leukemia Preleukemia Hematologic Neoplasms Leukemia, Lymphoid Precursor Cell Lymphoblastic Leukemia-Lymphoma Syndrome Acute Disease Orca-T


You can join if…

Open to people ages 18-65

  • Matched to a related or unrelated donor who is an 8/8 match for HLA-A, -B, -C, and DRB1
  • Diagnosed with one of the following diseases:
  • Acute myeloid, lymphoid or mixed phenotype leukemia in complete remission (CR) or CR with incomplete hematologic recovery (CRi), with or without the presence of known minimal residual disease
  • Myelodysplastic syndromes (MDS) that are high to very high risk or therapy-related/secondary MDS
  • Planned to undergo MA-alloHCT including one of the following myeloablative conditioning regimens:
  • TBI/Cy
  • TBI/Etoposide
  • BFT
  • Cardiac ejection fraction at rest ≥ 45% or shortening fraction of ≥ 27% by echocardiogram or radionuclide scan (MUGA)
  • Diffusing capacity of the lung for carbon monoxide (DLCO) (adjusted for hemoglobin) ≥ 50%
  • Negative serum or urine beta-HCG test in females of childbearing potential
  • ALT/AST < 3 times ULN
  • Recipients in screening must screen negative for SARS-CoV-2 RNA using a PCR-based test
  • Disease Risk Index (DRI) overall risk categorization of intermediate or high
  • Total bilirubin ≤ upper limit of normal (ULN)
  • Estimated glomerular filtration rate (eGFR) ≥ 60 mL/minute

You CAN'T join if...

  • Prior allogeneic HCT
  • Currently receiving corticosteroids or other immunosuppressive therapy. Topical corticosteroids or oral systemic corticosteroid doses less than or equal to 10 mg/day are allowed.
  • Planned donor lymphocyte infusion (DLI)
  • Planned pharmaceutical in vivo or ex vivo T cell depletion
  • Recipient positive anti-donor HLA antibodies against a mismatched allele in the selected donor
  • Karnofsky performance score < 70%
  • Hematopoietic cell transplantation-specific Comorbidity Index (HCT-CI) > 4
  • Uncontrolled bacterial, viral or fungal infections at time of enrollment
  • Seropositive for HIV-1 or -2, HTLV-1 or -2, Hepatitis B sAg, Hepatitis C antibody
  • Known allergy or hypersensitivity to, or intolerance of, tacrolimus
  • Documented allergy or hypersensitivity to iron dextran or bovine, murine, algal or Streptomyces avidinii proteins
  • Any uncontrolled autoimmune disease requiring active immunosuppressive treatment
  • Concurrent malignancies or active disease within 1 year, except non-melanoma skin cancers that have been curatively resected
  • Psychosocial circumstances that preclude the patient being able to go through transplant or participate responsibly in follow up care
  • Women who are pregnant or breastfeeding
  • Women of childbearing potential (WOCBP) or men who have sexual contact with WOCBP unwilling to use effective forms of birth control or abstinence for one year after transplantation


  • Ronald Regan UCLA Medical Center not yet accepting patients
    Los Angeles California 90095 United States
  • UC Davis not yet accepting patients
    Sacramento California 95817 United States
  • City of Hope not yet accepting patients
    Duarte California 91010 United States
  • Stanford Health Care accepting new patients
    Stanford California 94305 United States


accepting new patients at some sites,
but this study is not currently recruiting here
Start Date
Completion Date
Orca Biosystems, Inc.
Phase 3 research study
Study Type
Expecting 174 study participants
Last Updated