Characterisation of retinoblastomas without RB1 mutations: genomic, gene expression, and clinical studies

Characterisation of retinoblastomas without RB1 mutations: genomic, gene expression, and clinical studies
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DOI:
10.1016/s1470-2045(13)70045-7
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发表时间:
2013-04-01
期刊:
影响因子:
51.1
通讯作者:
Gallie, Brenda L.
Gallie, Brenda L.
中科院分区:
医学1区
文献类型:
--
作者:
Rushlow, Diane E.;Mol, Berber M.;Gallie, Brenda L.

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背景 视网膜母细胞瘤是一种儿童视网膜癌,具有肿瘤抑制基因。先前的研究表明,RB1 视网膜母细胞瘤抑制基因的两个等位基因的突变会引发疾病。我们的目的是表征没有可检测到的 RB1 突变的非家族性视网膜母细胞瘤肿瘤。方法在 1068 个单侧非家族性视网膜母细胞瘤肿瘤中,我们将没有 RB1 突变证据 (RB1(+/+)) 的肿瘤与两个等位基因均携带突变的肿瘤 (RB1(-/-)) 进行比较。我们分析了基因组拷贝数、RB1 基因表达和蛋白质功能、视网膜基因表达、组织学特征和临床数据。结果 在 1068 个单侧视网膜母细胞瘤肿瘤中,有 29 个(2.7%)未报告有 RB1 突变 (RB1(+/+))。 29 个 RB1(+/+) 肿瘤中有 15 个具有高水平 MYCN 癌基因扩增(28-121 个拷贝;RB1(+/+) MYCNA),而测试的 93 个 RB1(-/-) 原发肿瘤中没有一个显示 MYCN 扩增(p
Background Retinoblastoma is the childhood retinal cancer that defined tumour-suppressor genes. Previous work shows that mutation of both alleles of the RB1 retinoblastoma suppressor gene initiates disease. We aimed to characterise non-familial retinoblastoma tumours with no detectable RB1 mutations.Methods Of 1068 unilateral non-familial retinoblastoma tumours, we compared those with no evidence of RB1 mutations (RB1(+/+)) with tumours carrying a mutation in both alleles (RB1(-/-)). We analysed genomic copy number, RB1 gene expression and protein function, retinal gene expression, histological features, and clinical data.Findings No RB1 mutations (RB1(+/+)) were reported in 29 (2.7%) of 1068 unilateral retinoblastoma tumours. 15 of the 29 RB1(+/+) tumours had high-level MYCN oncogene amplification (28-121 copies; RB1(+/+) MYCNA), whereas none of 93 RB1(-/-) primary tumours tested showed MYCN amplification (p