Donor selection in allogeneic stem cell transplantation

Area of Science:

• Hematology
• Immunogenetics
• Transplantation Science

Background:

• Advances in human leukocyte antigen (HLA) characterization and donor pool expansion have increased donor availability for allogeneic hematopoietic stem cell transplantation.
• New platforms for haploidentical transplantation further broaden donor options.

Purpose of the Study:

• To analyze donor types, HLA and non-HLA factors influencing donor selection, and comparative outcomes in hematologic malignancies.
• To review the current landscape of donor selection in allogeneic hematopoietic stem cell transplantation.

Main Methods:

• Review of recent literature on HLA typing, donor selection algorithms, and comparative outcome studies.
• Analysis of retrospective studies comparing different donor types and their impact on transplantation success.

Main Results:

• HLA typing advances incorporate more loci and alleles (e.g., HLA A, B, C, DRB1, DQB1, DPB1) into donor selection.
• A consensus favors matched sibling donors, followed by matched unrelated donors, with alternative donors (haploidentical, mismatched unrelated, cord blood) gaining traction.
• Factors like donor age, patient condition, transplant urgency, and cost are challenging the traditional donor selection hierarchy.

Conclusions:

• The choice of donor in hematopoietic stem cell transplantation is complex, balancing HLA matching with clinical and logistical factors.
• Understanding the unique characteristics and outcomes associated with each donor type is crucial for optimizing patient treatment.
• Ongoing research and comparative studies are essential to refine donor selection strategies for hematologic malignancies.