Genomic temporal heterogeneity of circulating tumour DNA in unresectable metastatic colorectal cancer under first-line treatment.

Genomic temporal heterogeneity of circulating tumour DNA in unresectable metastatic colorectal cancer under first-line treatment.
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在一线治疗下不可切除的转移性结直肠癌中循环肿瘤DNA的基因组时间异质性。

DOI:
10.1136/gutjnl-2021-324852
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发表时间:
2022-07
期刊:
GUT
影响因子:
24.5
通讯作者:
Xu, Rui-Hua
Xu, Rui-Hua
中科院分区:
医学1区
文献类型:
--
作者:
Wang, Feng;Huang, You-Sheng;Wu, Hao-Xiang;Wang, Zi-Xian;Jin, Ying;Yao, Yi-Chen;Chen, Yan-Xing;Zhao, Qi;Chen, Shifu;He, Ming-Ming;Luo, Hui-Yan;Qiu, Miao-Zhen;Wang, De-Shen;Wang, Feng-Hua;Xu, Mingyan;Li, Yu-Hong;Xu, Rui-Hua

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循环肿瘤DNA(ctDNA)测序在结直肠癌患者的临床管理中应用日益广泛。然而,治疗期间ctDNA的基因组异质性及其对临床结局的影响在很大程度上仍不明确。 我们开展了一项前瞻性队列研究(NCT04228614),研究对象为171例不可切除的转移性结直肠癌(mCRC)患者,这些患者接受一线治疗。我们前瞻性地在基线时采集患者的血液样本,有或没有同时采集肿瘤样本,并在之后持续采集,直至疾病进展或最后一次随访。 63例患者配对的基线组织和血浆样本中RAS/BRAF突变情况显示出良好的一致性(81.0%,51/63)。经过一段时间的一线治疗(基线与最后一次液体活检之间的中位时间为4.67个月),42.6%(26/61)的RAS突变患者出现RAS清除,50.0%(5/10)的BRAF突变患者出现BRAF清除,而3.6%(3/84)和0.7%(1/135)的患者在ctDNA中出现新的RAS或BRAF突变。血浆中RAS/BRAF清除的患者,其无进展生存期(PFS)和总生存期(OS)与RAS/BRAF始终为野生型的患者相似,但比RAS/BRAF始终为突变型的患者预后要好得多。出现新RAS/BRAF突变的患者,其预后与RAS/BRAF始终为突变型的患者相似,且PFS和OS比RAS/BRAF始终为野生型的患者更短。 这项前瞻性、连续性、大规模的ctDNA分析研究揭示了mCRC相关体细胞变异的时间异质性,这在临床实践中应予以特别关注,血浆RAS/BRAF突变状态的改变可导致生存结局发生巨大变化这一发现就证明了这一点。
Circulating tumour DNA (ctDNA) sequencing is increasingly used in the clinical management of patients with colorectal cancer. However, the genomic heterogeneity in ctDNA during treatments and its impact on clinical outcomes remain largely unknown. We conducted a prospective cohort study (NCT04228614) of 171 patients with unresectable metastatic colorectal cancer (mCRC) who underwent first-line treatment and prospectively collected blood samples with or without tumour samples from patients at baseline and sequentially until disease progression or last follow-up. The RAS/BRAF alterations in paired baseline tissue and plasma samples from 63 patients displayed a favourable concordance (81.0%, 51/63). After a period of first-line treatment (median time between baseline and last liquid biopsy, 4.67 months), 42.6% (26/61) of RAS-mutant patients showed RAS clearance and 50.0% (5/10) of BRAF-mutant patients showed BRAF clearance, while 3.6% (3/84) and 0.7% (1/135) of patients showed new RAS or BRAF mutations in ctDNA. Patients with plasma RAS/BRAF clearance showed similar progression-free survival (PFS) and overall survival (OS) with patients who remained RAS/BRAF wild-type, while much better outcomes than those who remained RAS/BRAF mutant. Patients who gained new RAS/BRAF mutations showed similar prognosis as those who maintained RAS/BRAF mutations, and shorter PFS and OS than those who remained RAS/BRAF wild-type. This prospective, serial and large-scale ctDNA profiling study reveals the temporal heterogeneity of mCRC-related somatic variants, which should be given special attention in clinical practice, as evidenced by the finding that the shift in plasma RAS/BRAF mutational status can yield a drastic change in survival outcomes.
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