【AI详解】Preserved genetic diversity in organoids cultured from biopsies of human colorectal cancer metastases.

文献信息

一句话小结

本研究通过从14名转移性结直肠癌患者的活检样本中成功培养肿瘤类器官，验证了其保持肿瘤遗传多样性的潜力，且类器官与原始肿瘤在遗传特征上高度一致。研究结果表明，患者来源的肿瘤类器官可作为个性化抗癌治疗的有效体外检测平台，具有重要的临床应用价值。

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DNA测序 · 活检衍生的肿瘤类器官 · 结直肠癌 · 拷贝数分析 · 个性化医疗

摘要

肿瘤类器官是癌细胞的三维培养物。它们可以从每个患者的肿瘤中提取，从而为个性化治疗提供了一种有吸引力的体外检测方法。使用患者来源的肿瘤类器官进行此目的要求从活检衍生的类器官能够保持体内肿瘤的遗传多样性。在本研究中，从14名转移性结直肠癌患者处获取了肿瘤活检样本，旨在(i) 测试从转移性活检标本中培养类器官的可行性，以及(ii) 比较患者来源的肿瘤类器官与原始肿瘤活检的遗传多样性。遗传分析使用SOLiD测序技术对1977个与癌症相关的基因进行了分析。通过CopywriteR从测序数据生成拷贝数谱。我们在此展示，从转移性结直肠癌患者的肿瘤活检中建立类器官培养的成功率为71%。遗传分析显示，类器官反映了其来源的转移情况。90%的体细胞突变在类器官与同一患者的活检之间是共享的，而类器官与相应原始肿瘤的DNA拷贝数谱的相关性为0.89。最重要的是，在肿瘤或类器官培养中独有的突变均不在驱动基因或适合药物靶向的基因之中。这些发现支持进一步探讨患者来源的类器官作为个性化抗癌治疗的体外平台。

英文摘要

Tumor organoids are 3D cultures of cancer cells. They can be derived from the tumor of each individual patient, thereby providing an attractive ex vivo assay to tailor treatment. Using patient-derived tumor organoids for this purpose requires that organoids derived from biopsies maintain the genetic diversity of the in vivo tumor. In this study tumor biopsies were obtained from 14 patients with metastatic colorectal cancer (i) to test the feasibility of organoid culture from metastatic biopsy specimens and (ii) to compare the genetic diversity of patient-derived tumor organoids and the original tumor biopsy. Genetic analysis was performed using SOLiD sequencing for 1,977 cancer-relevant genes. Copy number profiles were generated from sequencing data using CopywriteR. Here we demonstrate that organoid cultures can be established from tumor biopsies of patients with metastatic colorectal cancer with a success rate of 71%. Genetic analysis showed that organoids reflect the metastasis from which they were derived. Ninety percent of somatic mutations were shared between organoids and biopsies from the same patient, and the DNA copy number profiles of organoids and the corresponding original tumor show a correlation of 0.89. Most importantly, none of the mutations that were found exclusively in either the tumor or organoid culture are in driver genes or genes amenable for drug targeting. These findings support further exploration of patient-derived organoids as an ex vivo platform to personalize anticancer treatment.

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主要研究问题

1. 如何评估肿瘤类器官在保持遗传多样性方面的有效性？
2. 患者来源的肿瘤类器官在个性化抗癌治疗中有哪些具体应用？
3. 在进行肿瘤类器官培养时，如何优化培养条件以提高成功率？
4. 除了结直肠癌，其他类型癌症的肿瘤类器官是否也能保持遗传多样性？
5. 对于未能在肿瘤类器官中检测到的突变，可能的生物学意义是什么？

核心洞察

研究背景和目的

肿瘤器官oid是从癌细胞建立的三维培养系统，可以从每个患者的肿瘤中获得，从而为个性化治疗提供了一种有吸引力的体外实验平台。本研究旨在验证从转移性结直肠癌患者的活检中培养肿瘤器官oid的可行性，并比较患者衍生的肿瘤器官oid与原始肿瘤活检的遗传多样性，以确保培养的器官oid能够保持肿瘤的遗传特征。

主要方法/材料/实验设计

• 研究设计：前瞻性观察研究。
• 入排招募标准：14名转移性结直肠癌患者参与研究，所有患者均签署了知情同意书，接受2至4次18号针的活检。
• 分组与随机化方式：无随机化，所有患者均为研究对象。
• 干预措施：从活检中提取细胞，采用Matrigel进行培养，使用优化的生长介质促进肿瘤细胞的生长。
• 主要与次要结局指标：
  • 主要结局指标：肿瘤器官oid的培养成功率、肿瘤活检与器官oid的遗传多样性比较。
  • 次要结局指标：突变和拷贝数分析的相关性。
• 统计分析方法：采用SOLiD测序技术分析1,977个癌症相关基因的突变，使用CopywriteR生成拷贝数剖面，计算肿瘤活检和器官oid之间的相关性。

关键结果和发现

• 成功培养肿瘤器官oid的比例为71%（10/14例）。
• 进行遗传分析的8名患者中，90%的体细胞突变在肿瘤活检和相应的器官oid中是共享的。
• 肿瘤活检与器官oid的DNA拷贝数剖面之间的相关性为0.89（范围0.77–0.96）。
• 发现的突变中，没有仅在肿瘤或器官oid中存在的突变是与药物靶向相关的驱动基因突变。

主要结论/意义/创新性

本研究表明，从转移性结直肠癌的活检中可以成功建立肿瘤器官oid，并且这些器官oid能够在遗传上代表其来源的转移性肿瘤。这为将患者衍生的肿瘤器官oid转化为临床应用提供了支持，作为个性化治疗的体外筛选平台。

研究局限性和未来方向

• 研究局限性：由于活检中肿瘤细胞比例较低，可能导致对拷贝数异常和体细胞突变的检测不准确。此外，肿瘤的异质性和培养条件的选择可能会影响结果。
• 未来方向：建议进行临床试验，以验证肿瘤器官oid在个性化抗癌治疗中的预测价值，并探索如何提高从活检中提取的肿瘤细胞的质量和数量。

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引用本文的文献

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