P

Thomas Bräutigam
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引用次数: 0

摘要

使用小核心活检的胰腺癌基因组分析在精准医学中发挥了越来越突出的作用。然而,如果不适当保存,来自胰腺组织的核酸(NA)由于高内在核酸酶水平而容易降解。PAXgene固定(PreAnalytix,瑞士)代表了一种新的不含福尔马林的组织保存方法。我们试图比较paxgene固定石蜡包埋(PFPE)和福尔马林固定石蜡包埋(FFPE)保存的胰腺癌组织的NA和组织形态学保存。19例患者从胰十二指肠切除术标本中获得前瞻性组织,并由四位胃肠病理学家评估。提取的NA通过Nanodrop和Qubit进行定量,并通过qPCR、靶向下一代测序(NGS)和rna测序来评估质量。我们的结果表明,当盲目评估形态学质量时,四位病理学家认为PFPE玻片足以用于诊断目的。PFPE组织能够产生更少碎片化和更容易扩增的DNA。PFPE组织在靶向NGS分析中显示出显著改善的质量控制(QC)指标,包括中位数绝对对差(MAPD)评分。我们的研究结果支持使用PAXgene固定剂处理胰腺癌标本,其潜在的好处是提高了低产量活检标本中更多可扩增DNA的产量,并理想地用于基于扩增子的NGS检测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
P
Genomic profiling of pancreatic cancer using small core biopsies has taken an increasingly prominent role in precision medicine. However, if not appropriately preserved, nucleic acids (NA) from pancreatic tissues are known to be susceptible to degradation due to high intrinsic levels of nucleases. PAXgene fixation (PreAnalytix, Switzerland) represents a novel formalin-free tissue preservation method. We sought to compare the NA and histomorphological preservation of pancreatic cancer tissues preserved with PAXgene-fixed paraffin-embedding (PFPE) and formalinfixed paraffin-embedding (FFPE). Tissues from 19 patients were obtained prospectively from pancreaticoduodenectomy specimens and evaluated by four gastrointestinal pathologists. The extracted NA were quantified by Nanodrop and Qubit and assessed for quality by qPCR, targeted next-generation sequencing (NGS) assay, and RNA-sequencing. Our results demonstrated that, when assessed blindly for morphological quality, the four pathologists deemed the PFPE slides adequate for diagnostic purposes. PFPE tissues enable greater yields of less fragmented and more amplifiable DNA. PFPE tissues demonstrated significantly improved quality control (QC) metrics in a targeted NGS assay including Median Absolute Pair-wise Difference (MAPD) scores. Our results support the use of PAXgene fixative for the processing of specimens from pancreatic cancers with the potential benefits of improved yields for more amplifiable DNA in low-yield biopsy specimens and its ideal use for amplicon-based NGS assays.
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