PMID: 7529549Oct 1, 1994Paper

Origin and biology of a testicular Wilms' tumor

Genes, Chromosomes & Cancer
A J GillisL H Looijenga

Abstract

A pure triphasic testicular Wilms' tumor, without teratomatous elements, was studied using multiple techniques. Carcinoma in situ (CIS), the characteristic precursor of testicular germ cell tumors of adults (TGCTs), was found in the adjacent parenchyma. Flow cytometric analysis showed a single hypotriploid tumor stem line. Karyotyping of the tumor revealed some numerical and structural abnormalities, including an i(12p), the chromosomal marker of TGCTs. In situ hybridization supported the karyotypic findings, and showed a similar numerical distribution in CIS and the tumor. Molecular analysis of the tumor illustrated that all short arms of chromosome 12, including i(12p), were of maternal origin. No 12q deletions were detected. In spite of complete loss of the paternal 11p13 band, the zinc finger regions and exons 2 and 6 of the WT1 gene contained no aberrations. Therefore, this tumor suppressor gene is not inactivated due to aberrations in the studied regions. In addition, all four WT1 alternative transcripts were expressed in the tumor. No aberrations were found in chromosomal bands 11p15.5, 16q22.1, and 16q24. Both parental alleles of the human imprinted genes H19 and IGF2 were expressed in the tumor. This is the first repor...Continue Reading

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Sep 16, 1998·The American Journal of Surgical Pathology·H MichaelT M Ulbright
Apr 24, 2004·The American Journal of Surgical Pathology·Robert E EmersonLiang Cheng
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