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Haploidentical transplantation for hematologic malignancies: where do we stand?

Ephraim J Fuchs¹

¹Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD 21287, USA. fuchsep@jhmi.edu

Hematology. American Society of Hematology. Education Program

|December 13, 2012

Summary

Human leukocyte antigen (HLA)-haploidentical stem cell transplantation (haplo-SCT) faces challenges from T-cell responses. Strategies now improve haplo-SCT safety, making it a viable alternative donor transplantation option.

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Area of Science:

Immunology
Hematology
Transplantation Medicine

Background:

The primary barrier to HLA-haploidentical stem cell transplantation (haplo-SCT) is the host and donor T-cell response to allogeneic HLA molecules.
This response increases risks of graft failure, graft-versus-host disease (GVHD), and nonrelapse mortality.

Purpose of the Study:

To mitigate host-versus-graft and graft-versus-host responses in haplo-SCT.
To preserve essential immune functions against infection and malignancy post-transplant.
To enhance the safety and applicability of haplo-SCT.

Main Methods:

Supplementing T cell-depleted grafts with controlled alloreactive T cells (e.g., pathogen-specific T cells).
Selectively eliminating alloreactive T cells from T cell-replete grafts.

Main Results:

Significant advancements have been made in both T-cell manipulation strategies.
The safety profile of haplo-SCT now approaches that of transplantation with umbilical cord blood or HLA-matched sibling grafts.
HLA-haploidentical donors are widely available, offering a potential donor for nearly all patients needing allogeneic SCT.

Conclusions:

Haplo-SCT is becoming a safe and accessible alternative donor transplantation method.
Further prospective studies comparing haploidentical SCT with unrelated donor SCT are needed.
Identifying the most effective alternative donor transplantation approach is crucial.