2022 ASCO:复发或难治性B细胞非霍奇金淋巴瘤中CD20和CD19表达缺失,一项回顾性队列研究

2022-06-04 紫菀款冬 MedSci原创

分析探讨复发或难治性B细胞非霍奇金淋巴瘤中,CD20和CD19表达缺失的影响。

背景:CD20靶向治疗如利妥昔单抗,广泛用于B细胞非霍奇金淋巴瘤(NHL)。用抗CD20药物进行再治疗很常见,但之前的研究表明,在一部分复发或难治性疾病患者中, CD20 表达缺失。对于复发或难治性疾病,人们对替代靶点、特别是 CD19的兴趣也越来越大。CD19丢失的发生率已经在CAR后T细胞治疗患者中进行了探讨,但在其他方面没有描述。假设由于 CD20 和 CD19 靶向治疗的扩大使用,CD 标志物丢失可能高于以前的报告。

方法:该研究是一项回顾性队列分析,对象是2006年至2022年来自加利福尼亚州洛杉矶某医疗中心的229名 B 细胞 NHL 患者。回顾性分析了 B 细胞 NHL 病例的图表,并收集了有关人口统计学、诊断、治疗和复发的数据。CD20 和 CD19 表达分析通过免疫组织化学和/或流式细胞术在诊断和每次复发时尽可能进行。该研究的主要终点是复发时 CD 标志物表达丧失的比率

结果:229名患者的队列包括54.1%的弥漫性大B细胞淋巴瘤(DLBCL)、14.4%的滤泡性淋巴瘤(FL)、8.3%的高级别B细胞淋巴瘤(HGBCL)、7.0%的边缘区淋巴瘤(MZL)、4.8%的套细胞淋巴瘤(MCL)和11.2%的其他患者。总的来说,28.8%(66/229)的患者有复发或难治性疾病。

在所有复发中,CD20表达丢失率为7.9%(5/63),其中两名患者在第一次复发时转化(1名FL复发为HGBCL,1名为MZL),两名患者在第二次复发时(1名FL复发为DLBCL,1名MZL复发为DLBCL),一名患者在第五次复发(1名MZL)。所有5名CD20 表型转换的患者都接受了利妥昔单抗治疗,3名患者接受了两轮或以上的抗CD20治疗。

CD20表达缺失后的中位OS为4个月(95% CI 3.3 – 4.7 个月)。所有在复发时进行 CD19 检测的患者 (14/14) 均保持 CD19 阳性。

结论:这项回顾性研究表明,复发时 CD20 表达丢失率为 7.9%,低于先前报道的11-60%的比率。CD20表达缺失似乎与转化为高级别淋巴瘤、低总生存期和边缘区组织学有关复发期间CD19表达的保守性支持在复发或难治性环境中使用新型抗CD19靶向治疗。只要有可能,在使用CD靶向治疗之前,应在复发时进行重复活检。该研究与抗CD20药物和新型CD19靶向疗法在B细胞 NHL 管理中的广泛应用具有显着的临床相关性。

原始出处:

Joseph Patrick Marshalek,, et al. CD20 and CD19 expression loss in relapsed or refractory b-cell non-Hodgkin lymphoma: A retrospective cohort.

https://meetings.asco.org/abstracts-presentations/210050

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    2022-07-26 aliceclz
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    2023-05-15 quxin068
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    2022-06-04 dingxiaobo
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    2022-06-04 freve
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