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Differential expression of MYC in H. pylori-related intestinal and diffuse gastric tumors

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Abstract

Evidence suggests that the carcinogenic process guided by Helicobacter pylori is related to the expression of cell cycle and apoptosis proteins as BCL-2, BAX, and MYC. However, the literature is conflicting regarding the expression frequency in the histological subtypes and did not consider cagA gene presence. To investigate the expression of these proteins considering the histological subtypes of gastric cancer associated with H. pylori (cagA), a total of 89 cases were used. H. pylori infection and cagA status were determined by PCR. Immunodetection was performed for MYC, BCL-2, and BAX proteins. H. pylori was found in 95.5% of the patients, among them, 65.8% were cagA(+). Nuclear MYC was detected in 36.4%, BAX in 55.7%, while BCl-2 in just 5%. Nuclear MYC staining was significantly lower in the intestinal than diffuse subtype (p = 0.008) and was related with the presence of H. pylori cagA(+). Additionally, most of the few cases cytoplasmic MYC positive were in the intestinal subtype. In diffuse tumors, although most nuclear MYC positive cases were cagA(+), it was not significant. No difference was observed between BCL-2 or BAX expression considering the presence of cagA gene in the histological subtypes. It seems that MYC could be relevant for the diffuse tumorigenic pathway associated with H. pylori and possibly influenced by the presence of cagA gene, while in intestinal tumors, the tumorigenic pathway does not occur through the MYC expression.

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The authors declare that they have no conflicts of interest.

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Authors and Affiliations

  1. Department of Pathology and Forensic Medicine, Microbiology and Pathologic Section, Federal University of Ceará State, 60183-630, Fortaleza, Brazil

    Isabelle Joyce de Lima Silva-Fernandes, Markênia Kélia Santos Alves, Valeska Portela Lima, Marcos Antônio Pereira de Lima, Márcia Valéria Pitombeira Ferreira & Silvia Helena Barem Rabenhorst

  2. Santa Casa de Misericórdia Hospital Fortaleza, Fortaleza, Brazil

    Marcos Aurélio Pessoa Barros

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  1. Isabelle Joyce de Lima Silva-Fernandes
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  2. Markênia Kélia Santos Alves
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  3. Valeska Portela Lima
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Correspondence to Isabelle Joyce de Lima Silva-Fernandes.

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Silva-Fernandes, I.J.L., Alves, M.K.S., Lima, V.P. et al. Differential expression of MYC in H. pylori-related intestinal and diffuse gastric tumors. Virchows Arch 458, 725–731 (2011). https://doi.org/10.1007/s00428-011-1085-y

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  • DOI: https://doi.org/10.1007/s00428-011-1085-y

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