Abstract
Hematopoietic stem cell transplantation (HSCT) from an HLA haploidentical family donor is an option for patients who do not have a full HLA matched donor and lack the time to find an unrelated one [1,2]. Furthermore, it may facilitate a powerful graft versus leukemia/lymphoma (GVL) effect to help combat hematological malignancies by directly targeting the mismatched HLA expressed on leukemia/lymphoma cells [3]. On the contrary, leukemia/lymphoma cells escape from the surveillance of the donor-derived GVL effect by losing the target HLA (mismatched HLA in GVH direction). This mechanism has been called loss of heterozygosity (LOH) in the HLA gene region on chromosome 6 [4,5]. Taking the above into account, in this case report, we present a case of lymphoma with monosomy 6, which means natural LOH of HLA, and suggest that selection of a haploidentical family donor matched with the missing HLA haplotype seems to be very effective.
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