AlloHeme is a blood-based monitoring test developed by the CareDx laboratory that utilizes NGS technology coupled with a proprietary algorithm to predict the likelihood of a relapse in post-allo-HCT AML/MDS patients. The technology analyzes 405 single nucleotide polymorphisms (SNPs) selected from across all somatic chromosomes between the donor and the recipient. Pre-transplant DNA is obtained from donor and/or recipient to identify specific donor and recipient SNPs (baseline samples). Post-transplant blood samples are obtained and compared to the baseline sample profiles to precisely calculate the percentage chimerism of recipient cells in the blood samples using a proprietary quantitative method and unique dual indexing that optimizes recipient DNA at trace levels. This approach enables highly accurate and reproducible chimerism measurement with a limit of detection down to 0.02%. The AlloHeme test leverages a proprietary algorithm that integrates this multi-analyte longitudinal chimerism data with post-transplant time points to predict the likelihood of a clinical relapse for AML/MDS patients following an allo-HCT.

Inclusion Criteria:

1. Adults aged 18 years or above.
2. The participant must have one of the following diseases: AML or MDS (including CMML) and be eligible for allogeneic hematopoietic stem cell transplant. For participants with active disease (> 5% blasts) before HCT, the treating physician must have the intent to perform a bone marrow examination at day 30 post-HCT as SOC patient management to confirm complete remission (<5% blasts).
3. Participant must receive an allo-HCT from an HLA-matched related or unrelated donor, an HLA-mismatched donor, or a haploidentical donor.
4. Participant can be enrolled before, at, or up to 1-month post-allo-HCT as long as the participant is in complete remission (CR) at Day 30 and that a recipient pre-transplant or donor sample is available for baseline genotyping (reference). If the reference sample is unavailable or fails testing, the buccal swab collected at Day 30 may be used as the reference sample.
5. Myeloablative or reduced intensity/non-myeloablative conditioning except T-cell depleting therapies (Ex-vivo T cell depletion, CD34 selected graft, use of anti-thymocyte globulin or alemtuzumab).
6. Any graft versus host disease (GVHD) prophylaxis regimen.
7. Willing and able to provide written informed consent.
8. Willing and able to comply with study visits and procedures, including scheduled sample collections and clinical assessments

Exclusion Criteria:

1. History of prior allo-HCT or any prior solid organ transplant.
2. Syngeneic donor (identical twin).
3. T cell depleted transplant (Ex-vivo T cell depletion, CD34 selected graft, use of antithymocyte globulin or alemtuzumab in the conditioning regimen)
4. Cord blood graft.
5. Pregnancy
6. Any condition that, in the investigator's opinion, would interfere with the participant's ability to comply with study procedures or jeopardize their safety.
7. Concurrent participation in an interventional or maintenance clinical trial for post allo-HCT relapse prevention; co-enrollment with other trials, such as those intended for GVHD / infection prevention or improving supportive care, is allowed.

AML, MDS, CMML

This will be discussed and updated at a later time.