Cytogenetic and molecular genetic studies were performed on a pleomorphic sarcoma removed from the left atrium of a 15-year-old girl. Histologic analysis was consistent with a storiform-pleomorphic malignant fibrous histiocytoma (MFH). Although MFH is the most common soft-tissue sarcoma of late adulthood. It is extremely rare in childhood and its existence in the pediatric population remains controversial. Cytogenetic analysis revealed several alterations previously associated with adult MFH, including abnormalities of chromosomal bands 11p11 and 19p13. Moreover, the tumor demonstrated homogeneously staining regions (HSR) and double minute chromosomes (dmin) suggestive of gene amplification. We therefore screened the case for amplification of genes localized to chromosomal bands 12q13-14, including the putative protooncogenes MDM2, CDK4, SAS, CHOP, and CLI, which are frequently amplified and overexpressed in adult MFH. Southern and Northern blot analysis confirmed the coamplification of MDM2, CDK4, SAS, and CHOP. To our knowledge, such coamplification studies of the 12q13-14 amplicon have not been previously detected in pediatric MFH. Our results provide cytogenetic and molecular genetic evidence that pediatric and adult MFH are histogenetically related entities.

译文

细胞遗传学和分子遗传学研究是从一个15岁女孩的左心房切除的多形性肉瘤。组织学分析与星形样多形性恶性纤维组织细胞瘤(MFH)一致。尽管MFH是成年后期最常见的软组织肉瘤。它在儿童时期极为罕见,其在儿科人群中的存在仍然引起争议。细胞遗传学分析揭示了以前与成人MFH相关的几种改变,包括染色体条带11p11和19p13的异常。此外,肿瘤表现出均一的染色区(HSR)和双分钟染色体(dmin),提示基因扩增。因此,我们筛选了扩增位于染色体12q13-14的基因的案例,包括推定的原癌基因MDM2,CDK4,SAS,CHOP和CLI,这些基因在成年MFH中经常被扩增和过表达。 Southern和Northern印迹分析证实了MDM2,CDK4,SAS和CHOP的共扩增。据我们所知,这种12q13-14扩增子的共扩增研究以前未在儿科MFH中检测到。我们的研究结果提供了细胞遗传学和分子遗传学证据,表明小儿和成人MFH是组织遗传学相关的实体。

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