Interrelationship between chromosome 8 aneuploidy, C-MYC amplification and increased expression in individuals from northern Brazil with gastric adenocarcinoma

Date
2006-10-14Author
Calcagno, Danielle Queiroz [UNIFESP]
Leal, Mariana Ferreira [UNIFESP]
Seabra, Aline Damaceno
Khayat, Andre Salim
Chen, Elizabeth Suchi [UNIFESP]
Demachki, Samia
Assumpção, Paulo Pimentel [UNIFESP]
Girao Faria, Mario Henrique
Rabenhorst, Silvia Helena Barem
Ferreira, Márcia Valéria Pitombeira
Cardoso Smith, Marilia de Arruda [UNIFESP]
Burbano, Rommel Rodriguez [UNIFESP]
Type
ArtigoISSN
1007-9327Is part of
World Journal Of GastroenterologyDOI
10.3748/WJG.v12.i34.5544Metadata
Show full item recordAbstract
AIM: To investigate chromosome 8 numerical aberrations, C-MYC oncogene alterations and its expression in gastric cancer and to correlate these findings with histopathological characteristics of gastric tumors.METHODS: Specimens were collected surgically from seven patients with gastric adenocarcinomas. Immunostaining for C-MYC and dual-color fluorescence in situ hybridization (FISH) for C-MYC gene and chromosome 8 centromere were performed.RESULTS: All the cases showed chromosome 8 aneuploidy and C-MYC amplification, in both the diffuse and intestinal histopathological types of Lauren. No significant difference (P < 0.05) was observed between the level of chromosome 8 ploidy and the site, stage or histological type of the adenocarcinomas. C-MYC high amplification, like homogeneously stained regions (HSRs) and double minutes (DMs), was observed only in the intestinal-type. Structural rearrangement of C-MYC, like translocation, was observed only in the diffuse type. Regarding C-MYC gene, a significant difference (P < 0.05) was observed between the two histological types. The C-MYC protein was expressed in all the studied cases. In the intestinal-type the C-MYC immunoreactivity was localized only in the nucleus and in the diffuse type in the nucleus and cytoplasm.CONCLUSION: Distinct patterns of alterations between intestinal and diffuse types of gastric tumors support the hypothesis that these types follow different genetic pathways. (C) 2006 The WJG Press. All rights reserved.
Citation
World Journal Of Gastroenterology. Beijing: W J G Press, v. 12, n. 38, p. 6207-6211, 2006.Collections
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