PLoS Genet:三阴性乳腺癌与同源重组缺陷有关!

2017-06-27 Emma MedSci原创

三阴性乳腺癌(TNBC)是指癌组织免疫组织化学检查结果为雌激素受体(ER)、孕激素受体(PR)和原癌基因Her-2均为阴性的乳腺癌。临床表现为一种侵袭性病程,其远处转移风险较高,内脏转移机会较骨转移高,脑转移几率也较高,预后较其他类型差。

三阴性乳腺癌(TNBC)是指癌组织免疫组织化学检查结果为雌激素受体(ER)、孕激素受体(PR)和原癌基因Her-2均为阴性的乳腺癌。临床表现为一种侵袭性病程,其远处转移风险较高,内脏转移机会较骨转移高,脑转移几率也较高,预后较其他类型差。目前除了聚ADP-核糖聚合酶抑制剂之外,对于这种类型的癌症来说,几乎没有有效的治疗选择。

研究人员通过高覆盖全基因组测序和转录组以及全外显子测序,分析TNBC遗传改变的综合表征,结果显示,BRCA1基因的沉默损害了一些TNBC亚群同源重组途径,表现出与BRCA1突变相似的肿瘤表型且拥有许多连续重复的结构变化(SVs)。SVs与致癌事件发生相关,如MYC、NOTCH2或NOTCH3的扩增,还影响RB1、PTEN和KMT2C等肿瘤抑制基因的表达。克隆分析表明癌症发生早期,BRCA1启动子中TP53发生突变和CpG二核苷酸甲基化。并且研究人员确定了TGFA增强子区域,SVs影响TGFA增强子区域,导致编码表皮生长因子受体的高亲和力配体之一的TGFA致癌基因的表达增强。研究人员还定位了可以转化3T3小鼠成纤维细胞的多种致癌基因,这表明TNBC肿瘤的发生可能经历了可以定位的独特引发事件,这对TNBC的临床治疗和预后具有重要意义。

原始出处:
Masahito Kawazu , et al. Integrative analysis of genomic alterations in triple-negative breast cancer in association with homologous recombination deficiency. PLoS Genet. 2017 Jun 21;13(6):e1006853. doi: 10.1371/journal.pgen.1006853.

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    2018-02-06 canlab
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    2018-03-21 cy0324
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