Frequent loss of heterozygosity for chromosome 10 in uterine leiomyosarcoma in contrast to leiomyoma.

Frequent loss of heterozygosity for chromosome 10 in uterine leiomyosarcoma in contrast to leiomyoma.
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与平滑肌瘤相比,子宫平滑肌肉瘤中 10 号染色体杂合性频繁丢失。

DOI:
10.1016/s0002-9440(10)65342-4
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发表时间:
1999
期刊:
The American journal of pathology
影响因子:
--
通讯作者:
Crum,CP
Crum,CP
中科院分区:
--
文献类型:
--
作者:
Quade,BJ;Pinto,AP;Howard,DR;Peters3rd,WA;Crum,CP

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恶性子宫平滑肌瘤与良性平滑肌瘤的鉴别并不总是能够通过形态学标准来进行。平滑肌瘤通常有复杂的细胞遗传学异常;相反,平滑肌瘤有简单的或没有细胞遗传学异常。为了更好地理解这些肿瘤之间的生物学差异,我们分析了基因组不稳定性的另外两个潜在标记,杂合性丢失(洛)和微卫星不稳定性。我们通过聚合酶链反应检测了16例平滑肌瘤和13例良性平滑肌瘤的26个微卫星多态性。标记物的选择是基于先前报道的平滑肌瘤或平滑肌瘤的细胞遗传学或分子遗传学异常,并调查了7、9、10、11、12、14、15、16、18、21和X染色体。染色体15、18、21和X上的标记物的洛在平滑肌瘤中是罕见的(每条染色体6个肿瘤中的1个),并且在染色体7、9、11、12、14或16上的标记物中没有观察到。有趣的是,14例信息性平滑肌瘤中有8例(57.2%)在10号染色体上至少有一个标记存在洛缺失,45.5%(11例中有5例)涉及两条染色体臂。与平滑肌瘤相比,13例良性平滑肌瘤中未发现10号染色体的洛缺失。微卫星不稳定性在平滑肌瘤中少见,在平滑肌瘤中未检测到。临床病理学特征(例如,脱髓鞘、坏死和临床结果)似乎与10号染色体的洛丢失无关。与其他染色体相比,10号染色体上的洛缺失在平滑肌瘤中常见,而在良性平滑肌瘤中缺失。
Distinction of malignant uterine leiomyosarcomas from benign leiomyomas by morphological criteria is not always possible. Leiomyosarcomas typically have complex cytogenetic abnormalities; in contrast, leiomyomas have simple or no cytogenetic abnormalities. To understand better the biological distinction(s) between these tumors, we analyzed two other potential markers of genomic instability, loss of heterozygosity (LOH) and microsatellite instability. We examined archival materials from 16 leiomyosarcomas and 13 benign leiomyomas by polymerase chain reaction for 26 microsatellite polymorphisms. Markers were selected based on previous reports of cytogenetic or molecular genetic abnormalities in leiomyosarcomas or leiomyomas and surveyed chromosomes 7, 9, 10, 11, 12, 14, 15, 16, 18, 21, and X. LOH for markers on chromosomes 15, 18, 21, and X was infrequent in leiomyosarcomas (1 of 6 tumors for each chromosome) and not observed for markers on chromosomes 7, 9, 11, 12, 14, or 16. Interestingly, 8 of 14 (57.2%) informative leiomyosarcomas had LOH for at least one marker on chromosome 10 and involved both chromosomal arms in 45.5% (5 of 11). In contrast to leiomyosarcomas, LOH for chromosome 10 was not found in 13 benign leiomyomas. Microsatellite instability was found infrequently in leiomyosarcomas and not detected in leiomyoma. Clinicopathological features (eg, atypia, necrosis, and clinical outcome) did not appear to correlate with LOH for chromosome 10. In contrast to other chromosomes studied, LOH on chromosome 10 was frequent in leiomyosarcomas and absent in benign leiomyomas.
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发表时间: 1994-11-22
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