Department of Gastroenterology, Saint Joseph Hospital, Marseille 13008, France.
Aix-Marseille Univ, INSERM, MMG, Marseille 13385, France.
World J Gastroenterol. 2019 Sep 28;25(36):5530-5542. doi: 10.3748/wjg.v25.i36.5530.
BACKGROUND: DNA mutational analysis of pancreatic cystic fluid (CF) is a useful adjunct to the evaluation of pancreatic cysts. KRAS/GNAS or RAF/PTPRD/CTNNB1/RNF43 mutations are highly specific to precancerous or advanced neoplasia. Several studies recently demonstrated the ability of next-generation sequencing (NGS) analysis to detect DNA mutations in pancreatic CF, but few studies have performed a systematic comparative analysis between pancreatic CF and neoplastic surgical tissue (NT). The value of CF-NGS analysis indicators for determining surgical resection necessitates evaluation. AIM: To confirm whether CF genomic profiles are a reliable malignancy predictor by comparing NGS mutational analyses of CF and NT. METHODS: Patients requiring surgery for high-risk pancreatic cysts were included in a multicenter prospective pilot study. DNA from CF (collected by endoscopic ultrasound-guided fine needle aspiration (known as EUS-FNA)) and NT (collected by surgery) were analyzed by NGS. The primary objective was to compare the mutation profiles of paired DNA samples. The secondary objective was to correlate the presence of specific mutations (KRAS/GNAS, RAF/ PTPRD/CTNNB1/RNF43/POLD1/TP53) with a final cancer diagnosis. Sensitivity and specificity were also evaluated. RESULTS: Between December 2016 and October 2017, 20 patients were included in this pilot study. Surgery was delayed for 3 patients. Concordant CF-NT genotypes were found in 15/17 paired DNA, with a higher proportion of mutated alleles in CF than in NT. NGS was possible for all pancreatic CF collected by EUS-FNA. In 2 cases, the presence of a KRAS/GNAS mutation was discordant between CF and NT. No mutations were found in 3 patients with NT or pancreatic cysts with high-grade dysplasia. The sensitivity and specificity of KRAS/GNAS mutations in CF to predict an appropriate indication for surgical resection were 0.78 and 0.62, respectively. The sensitivity and specificity of RAF/PTPRD/CTNNB1 /RNF43/POLD1/TP53 mutations in CF were 0.55 and 1.0, respectively. CONCLUSION: Mutational analyses of CF and NT were highly concordant, confirming the value of NGS analysis of CF in the preoperative malignancy assessment. However, these results need to be confirmed on a larger scale.
背景:胰腺囊性液(CF)的 DNA 突变分析是评估胰腺囊肿的有用辅助手段。KRAS/GNAS 或 RAF/PTPRD/CTNNB1/RNF43 突变高度特异于癌前或高级肿瘤。最近有几项研究表明,下一代测序(NGS)分析能够检测胰腺 CF 中的 DNA 突变,但很少有研究对胰腺 CF 和肿瘤手术组织(NT)之间进行系统的比较分析。需要评估 CF-NGS 分析指标对确定手术切除的价值。
目的:通过比较 CF 和 NT 的 NGS 突变分析,确认 CF 基因组图谱是否是恶性肿瘤的可靠预测指标。
方法:本多中心前瞻性试点研究纳入了因高危胰腺囊肿而需要手术的患者。通过内镜超声引导下细针抽吸(EUS-FNA)收集 CF 及手术收集的 NT 的 DNA,进行 NGS 分析。主要目的是比较配对 DNA 样本的突变谱。次要目的是将特定突变(KRAS/GNAS、 RAF/ PTPRD/CTNNB1/RNF43/POLD1/TP53)的存在与最终癌症诊断相关联。还评估了敏感性和特异性。
结果:2016 年 12 月至 2017 年 10 月期间,本试点研究纳入了 20 例患者。其中 3 例患者手术推迟。15/17 对配对 DNA 中发现 CF-NT 基因型一致,CF 中突变等位基因的比例高于 NT。所有通过 EUS-FNA 收集的胰腺 CF 均可进行 NGS 分析。在 2 例中,CF 和 NT 之间的 KRAS/GNAS 突变存在不一致。在 3 例 NT 或高级别异型增生的胰腺囊肿患者中未发现突变。CF 中 KRAS/GNAS 突变预测手术切除指征的敏感性和特异性分别为 0.78 和 0.62。CF 中 RAF/PTPRD/CTNNB1/RNF43/POLD1/TP53 突变的敏感性和特异性分别为 0.55 和 1.0。
结论:CF 和 NT 的突变分析高度一致,证实了 CF 的 NGS 分析在术前恶性肿瘤评估中的价值。然而,这些结果需要在更大的范围内得到证实。
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