Nature:全基因组分析芳香化酶抑制剂治疗乳腺癌的疗效差异

2012-06-12 范泽玲 生物通

       由华盛顿大学圣路易斯分校领衔的研究团队发表了题为“Whole-genome analysis informs breast cancer response to aromatase inhibition”的文章,通过分析患有晚期乳腺癌患者的DNA序列,发现了不同癌症的标记,这将有助于预测雌激素降低治疗的疗效,并深入解析乳腺癌

       由华盛顿大学圣路易斯分校领衔的研究团队发表了题为“Whole-genome analysis informs breast cancer response to aromatase inhibition”的文章,通过分析患有晚期乳腺癌患者的DNA序列,发现了不同癌症的标记,这将有助于预测雌激素降低治疗的疗效,并深入解析乳腺癌为何能快速增殖并扩散。相关成果公布在Nature杂志上。

       文章通讯作者,华盛顿大学医学院基因组研究所主任Elaine Mardis 说,“这是首次利用癌症基因组研究成果,分析未知癌症突变,用以找到与治疗疗效和其它临床特征相关的突变”,“如果这项研究成果在更大规模中得到了验证,那么我们认为基因组信息就能成为临床医师,在多种治疗方案中进行选择的一个重要数据。”

       乳腺癌是女性最常见的恶性肿瘤之一,这种疾病通常发生在乳房腺上皮组织,发病率占全身各种恶性肿瘤的7-10%,是一种严重影响妇女身心健康甚至危及生命的最常见恶性肿瘤之一。

       这项研究选取了77位绝经后,第二阶段或第三阶段雌激素受体阳性乳腺癌患者(此类患者是最常见的乳腺癌形式),雌激素能刺激这些肿瘤的生长,因此这些女性患者需要接受芳香化酶抑制剂的治疗,以降低体内雌激素的含量。这些药物能缩小乳腺癌肿瘤的大小,帮助许多女性免除了切乳手术。但是这种治疗方法只在某些患者身上有效,对此医生们并不了解其中的原因。

       为了解答这一疑问,研究人员比对了患者肿瘤样品,以及健康细胞中的DNA,从中试图寻找只出现在癌细胞中的突变,利用这种方法,研究人员发现了患者癌细胞中的所有突变,而不仅仅是某些预期会出现的突变。

       研究的肿瘤样品来自两项肿瘤样品芳香化酶抑制剂临床试验之一,研究人员收集了患者肿瘤的详细信息,其中包括其是否对手术前,为期四个月的芳香化酶抑制剂治疗作出应答。其中29个肿瘤样品来自对芳香化酶抑制剂治疗发生抵抗的患者样品,48个样品来自作出反应的患者肿瘤样品。

       研究人员发现对雌激素降低药物作出应答的肿瘤样品,相对来说突变较少,而那些抵抗治疗的患者则突变率更高,基因组更加复杂。

       研究人员在肿瘤样品中发现了18个显著的突变基因,这些基因比预期的更常发生改变,其中一些是已知的重要乳腺癌基因,但是还有一些是出乎意料之外的,比如参与白血病的基因。

       为了分析这18个基因的临床意义,研究人员扩大了实验范围,加入了另外的240位雌激素受体阳性乳腺癌患者,她们对芳香化酶抑制剂治疗也有相关记录。

       结果研究人员在许多患者癌症中发现了几个相对常见,与治疗应答有关的基因——大约20%的肿瘤样品发生了一种重要抑癌基因:TP53的突变,这些突变关系着芳香化酶抑制剂疗效差,以及更易扩散的快速扩增肿瘤。带有TP53突变的患者也更加容易患者一种称为luminal B的乳腺癌亚型,这种亚型预后效果差。

       相反,出现在16%的患者中的另外一种突变:MAP3K1,以及其姊妹基因MAP2K4,则与芳香化酶抑制剂治疗疗效好相关联。带有这些基因的患者肿瘤生长速度较慢,并且不会扩散,常属于luminal A乳腺癌,预后效果好。

       还有一个称为GATA3的基因,也似乎与好的芳香化酶抑制剂治疗疗效有关,而MALAT1,一个长链非编码RNA则指向不良疗效。

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    2021-11-20 湘雅科教

    已阅,受益匪浅。

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    2012-12-18 liye789132251
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    2013-03-02 jklm09
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