Blood:粒单核细胞白血病的综合分子分析结果

2018-02-06 MedSci MedSci原创

粒单核细胞白血病(JMML)是一种罕见的侵袭性骨髓增生异常的/骨髓增生性肿瘤,好发于婴儿和幼儿期,特点是粒-单核细胞过度增殖。80%以上的患者的体细胞和生殖细胞的RAS通路基因带有突变(如PTPN11、NF1、NRAS、KRAS和CBL),既往研究已鉴定出几种与预后不良相关的生物标志物。但是,有10-20%的患者的分子病理机制以及相关生物标志物的相互关系尚未得以明确。为解析这些问题,Norihir

粒单核细胞白血病(JMML)是一种罕见的侵袭性骨髓增生异常的/骨髓增生性肿瘤,好发于婴儿和幼儿期,特点是粒-单核细胞过度增殖。80%以上的患者的体细胞和生殖细胞的RAS通路基因带有突变(如PTPN11、NF1、NRAS、KRAS和CBL),既往研究已鉴定出几种与预后不良相关的生物标志物。

但是,有10-20%的患者的分子病理机制以及相关生物标志物的相互关系尚未得以明确。为解析这些问题,Norihiro Murakami等人对来源于150位JMML患者的样本组织进行综合分子分析。通过RNA测序在16例(18%)不携带经典RAS通路突变的患者中的3位患者中,发现了ALK/ROS1酪氨酸激酶融合(DCTN1-ALK、RANBP2-ALK和TBL1XR1-ROS1)。

克唑替尼(Crizotinib),一种ALK/ROS1抑制剂,在体外可显着抑制ALK/ROS1融合炎性的JMML细胞增殖。因此,研究人员给一位化疗耐药性的携带RANBP2-ALK融合的患者注射了克唑替尼,该患者随后获得完全性分子缓解。此外,克唑替尼还可以抑制携带经典RAS通路突变的JMML细胞增殖。

对全基因组甲基化分析发现了一种类似于急性髓系白血病(AML)的“超甲基化”特征,与预后不良相关的遗传性标记有显着的相关性,如PTPN11/NF1基因突变、两个或多个遗传突变、AML型表达谱和LIN28B表达。

综上所述,研究人员在无静电RAS通路基因突变的JMML患者中发现了复发激活的ALK/ROS1融合,并揭示了JMML的生物标志物的相互关系。克唑替尼是一种有希望用于治疗JMML的候选药物,特别是针对携带ALK-/ROS1-融合的患者。

原始出处:

Norihiro Murakami,et al.Integrated molecular profiling of juvenile myelomonocytic leukemia.Blood  2018  :blood-2017-07-798157;  doi: https://doi.org/10.1182/blood-2017-07-798157

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    2018-02-07 天地飞扬

    了解一下.谢谢分享!

    0

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    2018-02-07 虈亣靌

    好文章大家共同分享

    0