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  • Oncogenomics
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Gene expression analysis of early and advanced gastric cancers

Oncogene volume 26, pages 4284–4294 (2007)Cite this article

Abstract

Gastric carcinoma is one of the major causes of cancer mortality worldwide. Early detection results in excellent prognosis for patients with early cancer (EGC), whereas the prognosis of advanced cancer (AGC) patients remains poor. It is not clear whether EGC and AGC are molecularly distinct, and whether they represent progressive stages of the same tumor or different entities ab initio. Gene expression profiles of EGC and AGC were determined by Affymetrix technology and quantitative polymerase chain reaction. Representative regulated genes were further analysed by in situ hybridization (ISH) on tissue microarrays. Expression analysis allowed the identification of a signature that differentiates AGC from EGC. In addition, comparison with normal gastric mucosa indicated that the majority of alterations associated with EGC are retained in AGC, and that further expression changes mark the transition from EGC to AGC. Finally, ISH analysis showed that representative genes, differentially expressed in the invasive areas of EGC and AGC, are not differentially expressed in the non-invasive areas of the same tumors. Our data are more directly compatible with a progression model of gastric carcinogenesis, whereby EGC and AGC may represent different molecular stages of the same tumor. Finally, the identification of an AGC-specific signature might help devising novel therapeutic strategies for advanced gastric cancer.

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Acknowledgements

We thank D Nicosia, A Hurtado, G Jodice, the Sequencing and the Affymetrix Services at IFOM for technical assistance. This work was supported by a grant from Cariplo Foundation to GC, and by AIRC (Italian Association for Cancer Research), the European Community (VI Framework), the Italian Ministries of Health, and of Education and University, the Monzino Foundation and the Ferrari Foundation to PPDF.

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Author notes

  1. M Vecchi and P Nuciforo: These two authors contributed equally to this work.

Authors and Affiliations

  1. IFOM Fondazione Istituto FIRC di Oncologia Molecolare, Milan, Italy

    M Vecchi, P Nuciforo, S Confalonieri, G Serio, M Quarto, M Capra & P P Di Fiore

  2. Dipartimento di Medicina, Pathology Unit, Ospedale San Paolo e Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Chirurgia e Odontoiatria, Università degli Studi di Milano, Milan, Italy

    S Romagnoli, C Pellegrini, G Coggi & S Bosari

  3. Dipartimento Scienze Chirurgiche, Università degli Studi di Milano e Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Milan, Italy

    G C Roviaro & E Contessini Avesani

  4. Dipartimento di Chirurgia e Specialità Chirurgiche, AO San Paolo, Milan, Italy

    C Corsi

  5. Dipartimento di Oncologia Sperimentale, Istituto Europeo di Oncologia, Milan, Italy

    P P Di Fiore

  6. Dipartimento di Medicina, Chirurgia e Odontoiatria, Università di Milano, Milan, Italy

    P P Di Fiore

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  1. M Vecchi
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  2. P Nuciforo
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Correspondence to P P Di Fiore or S Bosari.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Vecchi, M., Nuciforo, P., Romagnoli, S. et al. Gene expression analysis of early and advanced gastric cancers. Oncogene 26, 4284–4294 (2007). https://doi.org/10.1038/sj.onc.1210208

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