主要皮肤外围T细胞淋巴瘤具有TFH表型,具有不同的克隆B细胞和血细胞群和DNMT3A突变
Sahil Chaudhary1, Jinbo Fan1, Ifeyinwa E Obiorah1
1Department of Pathology and Laboratory Medicine, University of Virginia Health, Charlottesville, Virginia, USA.
Journal of cutaneous pathology
|January 29, 2026
概括
这项研究详细介绍了一种罕见的原发性皮肤外围T细胞淋巴瘤,其T毛囊辅助体表型 (pcTFH-PTCL) 与不同的B细胞克隆共存. 这些发现凸显了双系皮肤淋巴瘤的诊断挑战.
科学领域:
- 皮肤病学 皮肤病学
- 血液学 血液学 血液学
- 在瘤学瘤学.
背景情况:
- 主要皮肤外围T细胞淋巴瘤与T毛囊辅助体表型 (pcTFH-PTCL) 是罕见的.
- 在pcTFH-PTCL中,并发的克隆B系繁殖不常见,这给诊断带来了挑战.
研究的目的:
- 呈现一种罕见的pcTFH-PTCL病例,同时存在不同的B细胞和血细胞群.
- 调查双系血统参与皮肤淋巴瘤的克隆关系和遗传基础.
主要方法:
- 皮肤活检的组织病理学检查.
- 针对T细胞和B细胞标记物的免疫类型定型 (CD4,PD-1,ICOS,BCL6).
- T细胞受体 (TCR) 和免疫球蛋白重链 (IGH) 基因重排研究.
- 整体外基因组测序 (WES) 用于突变分析.
主要成果:
- 确定了一个pcTFH-PTCL病例,具有CD4+,TFH标志物阳性T细胞和相同的TCR基因重组.
- 多个病变显示出不同的B系组件与明显的IGH重组,表明独立的B细胞克隆.
- 整个外基因组测序揭示了来自不同部位的T细胞克隆中的致病性DNMT3A p.Arg882Cys突变.
结论:
- 这种病例突显出一种罕见的pcTFH-PTCL,具有持久的T细胞克隆和不同的克隆B细胞和血细胞群.
- 来自TFH的瘤可能会促进B细胞扩张,使皮肤淋巴瘤的诊断和治疗复杂化.
- 双系克隆性具有显著的诊断和治疗复杂性.
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