Blood:MYC变异和17p缺失提示B淋巴细胞白血病预后极差

2019-09-17 MedSci MedSci原创

前体B淋巴细胞白血病(B-PLL)是一种罕见的血液疾病,其潜在的致癌机制尚不明确。Elise Chapiro等人对34位B-PLL患者进行细胞学和分子评估,揭示了该疾病的多个疾病特异性的特征和潜在的治疗靶点。

中心点:

B-PLL与MYC变异(转位或扩增)和17p(TP53)缺失密切相关

携带MYC变异和17p(TP53)缺失的B-PLL病例的预后最差

摘要:

前体B淋巴细胞白血病(B-PLL)是一种罕见的血液疾病,其潜在的致癌机制尚不明确。Elise Chapiro等人对34位B-PLL患者进行细胞学和分子评估,揭示了该疾病的多个疾病特异性的特征和潜在的治疗靶点。

73%的患者具有复杂的核型(≥3个异常),45%的患者具有高度复杂的核型(≥5个异常).最常见的染色体异常是涉及MYC的易位(t[MYC])(62%)、缺失(del)17p(38%)、18号染色体-三体(tri)(30%)、del13q(29%)、tri3(24%)、tri12(24%)和del8p(23%)。34位患者中有26位(76%)表现为MYC异常,这是由于相互排斥的易位或获得所致。

全外显子组测序显示,TP53、MYD88、BCOR、MYC、SF3B1、SETD2、CHD2、CXCR4和BCLAF1经常发生突变。大部分B-PLL采用IGHV3或IGHV4亚型(89%),且表现出明显的IGHV基因突变(79%)。

研究人员确定了三个不同的细胞遗传学风险组:低风险组(无MYC变异)、中风险组(MYC变异但无del17p)和高风险组(MYC变异和del17p)。体外药物应答谱表明B细胞受体或BCL2抑制剂联合OTX015(靶向MYC的抑制剂)治疗可显著降低携带他t(MYC)的B-PLL细胞的存活能力。

总而言之,本研究表明细胞遗传学分析是一个可效诊断和预测B淋巴细胞白血病的工具。靶向MYC或可成为该疾病的治疗靶点。

原始出处:

Elise Chapiro, et al.Genetic characterization of B-cell prolymphocytic leukemia: a prognostic model involving MYC and TP53.Blood 2019 :blood.2019001187; doi: https://doi.org/10.1182/blood.2019001187

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    2019-09-19 guihongzh
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