在使用HLA-EMMA的9/10个非相关捐赠者的儿科干细胞移植中,允许的HLA不匹配:EBMT天生的错误工作组的研究
Erik G J von Asmuth1, Fleur Hiensch1, Sebastiaan Heidt2,3
1Willem Alexander Children's Hospital, Leiden University Medical Center, Leiden, The Netherlands.
Blood advances
|July 10, 2024
概括
在不匹配的无血缘捐赠者 (MMUD) 造血干细胞移植 (HSCT) 中识别允许的不匹配是至关重要的. 氨基酸匹配在宿主与移植方向的α螺旋上预测了有利的结果,类似于匹配的无关献体.
科学领域:
- 免疫遗传学 免疫遗传学
- 移植免疫学 移植免疫学
- 造血干细胞移植 造血干细胞移植
背景情况:
- 使用不匹配的无血缘捐赠者 (MMUD) 的全源造血干细胞移植 (HSCT) 与匹配的无血缘捐赠者 (MUD) 移植相比,与较差的结果有关.
- 目前的HLA匹配策略可能无法完全捕捉MMUD HSCT中免疫兼容性的细微差别.
- 识别允许有利结果的特定HLA不匹配对于扩大HSCT可访问性至关重要.
研究的目的:
- 为了确定使用基于氨基酸序列的算法来确定HLA表位组匹配是否可以在儿科MMUD HSCT中识别允许的不匹配.
- 为了比较允许不匹配的MMUD HSCT和MUD HSCT之间的移植结果.
- 在一个独立的队列中验证发现.
主要方法:
- 分析了70个儿科9/10 MMUD HSCT和157个10/10 MUD的单中心队列.
- 根据整个HLA蛋白,α螺旋和β片的氨基酸序列,对宿主与移植 (HvG) 和移植与宿主 (GvH) 方向进行了评估.
- 无事件生存率 (EFS) 和总生存率 (OS) 在各组之间进行了比较;结果在独立的EBMT注册表队列中得到了验证.
主要成果:
- 与允许不匹配的HVG (总HVG) 和α螺旋HVG (αHVG) 患者的EFS与其他MMUD相比显著优越.
- 在αHvG匹配的MMUD中,EFS和OS的比率与10/10MUD中的比率相当.
- EFS不受β表匹配或GvH方向匹配的影响.
结论:
- 在HLAα螺旋上对HVG氨基酸匹配有效地识别了9/10MMUD HSCT中允许的不匹配.
- 通过这种方法识别的允许不匹配与有利的移植结果相关,接近MUD HSCT.
- 这种基于表位的匹配策略可能会改善MMUD HSCT的供体选择和结果.
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