肺大细胞神经内分泌癌的突变分析:APC基因突变确定了一个良好的预后因素
Mengqian Li1, Ying Zhang1, Ping Zhou1
1Department of Pathology, West China Hospital, Sichuan University, Chengdu, China.
Lung cancer (Amsterdam, Netherlands)
|May 25, 2024
概括
大细胞神经内分泌癌 (LCNEC) 经常出现TP53和RB1突变. 野生型RB1与LCNEC中的APC变化与较低的瘤突变负担和更好的整体存活率相关.
科学领域:
- 在瘤学瘤学.
- 基因组学就是基因组学.
- 肺部医学 肺部医学
背景情况:
- 肺大细胞神经内分泌癌 (LCNEC) 是一种具有鲜为人知的遗传驱动因素的侵袭性癌症.
- 在LCNEC中,基因突变,组织学和患者结局之间的关联尚不清楚.
- 非典型的癌类瘤 (AC) 代表了一种不那么具有攻击性的神经内分泌肺瘤.
研究的目的:
- 研究LCNEC的临床病理学,免疫组织化学和基因组特征.
- 识别特定的基因变异及其与组织病理学特征和预后的相关性.
- 为了比较LCNEC与非典型的癌 (AC).
主要方法:
- 对19个LCNEC和9个AC患者样本进行了临床病理学,免疫组织化学和基因组分析.
- 突变分析的重点是TP53,RB1,APC和MCL1.
- 小组分析将LCNEC与APC突变 (LCNEC-APCMT) 与没有 (LCNEC-APCWT) 的基因组进行了比较.
主要成果:
- 在LCNEC中发现TP53 (89.5%),RB1 (42.1%),APC (31.6%) 和MCL1 (31.6%) 的高突变频率,AC中罕见的变化.
- APC的变化主要发生在16号外子中,并且仅限于LCNEC与野生类型RB1.1之间.
- 与LCNEC-APC的MT相比,LCNEC-APC的MT表现出较低的瘤突变负担 (TMB),较轻的细胞异型,下调的神经内分泌标记物,以及改变下游APC基因表达.
结论:
- 在LCNEC中,APC变化很常见,特别是在野生型RB1.1的瘤中.
- 有APC突变的LCNEC (LCNEC-APCMT) 显示出不同的基因组和分子配置文件.
- 与LCNEC-APC WT相比,LCNEC-APC MT可能与更好的整体存活率 (OS) 有关.
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