Case Report: Allogeneic hematopoietic stem cell transplantation in a patient with triple-allele expression at both HLA-B and HLA-C loci

This case highlights an extremely rare immunogenetic configuration in which triple-allele expression at two HLA class I loci directly influenced donor selection for allo-HSCT. Comprehensive interpretation of HLA typing results, including family analysis and protein-level expression, is essential when such atypical findings are encountered.