Somatic alterations contributing to metastasis of a castration-resistant prostate cancer.

Somatic alterations contributing to metastasis of a castration-resistant prostate cancer.
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DOI:
10.1002/humu.22346
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发表时间:
2013-09
期刊:
影响因子:
3.9
通讯作者:
Bova, G. Steven
Bova, G. Steven
中科院分区:
医学2区
文献类型:
--
作者:
Nickerson, Michael L.;Im, Kate M.;Misner, Kevin J.;Tan, Wei;Lou, Hong;Gold, Bert;Wells, David W.;Bravo, Hector C.;Fredrikson, Karin M.;Harkins, Timothy T.;Milos, Patrice;Zbar, Berton;Linehan, W. Marston;Yeager, Meredith;Andresson, Thorkell;Dean, Michael;Bova, G. Steven

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转移性去势抵抗性前列腺癌 (mCRPC) 是一种致命性疾病,需要区分惰性亚型和侵袭性亚型的分子标记。我们对 mCRPC 指标病例中 5 个转移性肿瘤和健康肾组织的外显子组进行了测序,以识别与疾病进展和转移相关的病变。观察到德系犹太人 (AJ) 种系创始人突变(BRCA1 中的 del185AG),并确认了 AJ 血统。 62 个体细胞变异改变了肿瘤中的蛋白质,包括癌症相关基因、TMPRSS2-ERG、PBRM1 和 TET2。大多数(n = 53)体细胞变异存在于所有转移瘤中,仅在原发肿瘤中观察到一小部分(n = 31)。整合肿瘤下一代测序 (NGS) 和 DNA 拷贝数显示 BRCA1 和 TMPRSS2-ERG 的体细胞丢失。我们对其他 mCRPC 样本中索引病例中具有有害突变的 19 个基因进行了测序,并检测到移码、两个体细胞错义改变、肿瘤杂合性丢失 (LOH) 以及 TET2 中种系错义 SNP 的组合。总之,对指示病例转移的遗传分析使我们能够根据躯体病变的连续发生来推断疾病克隆传播的年表。 TET2 在 mCRPC 中的作用值得进一步分析,并可能定义转移性疾病的一个子集。
Metastatic castration resistant prostate cancer (mCRPC) is a lethal disease and molecular markers that differentiate indolent from aggressive subtypes are needed. We sequenced the exomes of five metastatic tumors and healthy kidney tissue from an index case with mCRPC to identify lesions associated with disease progression and metastasis. An Ashkenazi Jewish (AJ) germline founder mutation, del185AG in BRCA1, was observed and AJ ancestry was confirmed. Sixty-two somatic variants altered proteins in tumors, including cancer-associated genes, TMPRSS2-ERG, PBRM1, and TET2. The majority (n=53) of somatic variants were present in all metastases and only a subset (n=31) was observed in the primary tumor. Integrating tumor next generation sequencing (NGS) and DNA copy number showed somatic loss of BRCA1 and TMPRSS2-ERG. We sequenced 19 genes with deleterious mutations in the index case in additional mCRPC samples and detected a frameshift, two somatic missense alterations, tumor loss of heterozygosity (LOH), and combinations of germline missense SNPs in TET2. In summary, genetic analysis of metastases from an index case permitted us to infer a chronology for the clonal spread of disease based on sequential accrual of somatic lesions. The role of TET2 in mCRPC deserves additional analysis and may define a subset of metastatic disease.
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