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Clinicopathological analysis of colorectal cancers with PIK3CA mutations in Middle Eastern population

Oncogene volume 27, pages 3539–3545 (2008)Cite this article

Abstract

Activation of the phosphatidylinositol 3′-kinase (PI3K)/AKT pathway results in an increase in cell proliferation and survival. Somatic mutations within the PI3K catalytic subunit, PIK3CA are common cause of increasing PI3K activity and are believed to be oncogenic in many cancer types. Few reports addressed the association between PIK3CA mutations and tumor progression specifically in microsatellite instable (MSI) colorectal cancer (CRC). In the present study, we have evaluated PIK3CA mutational status in a series of 410 Middle Eastern CRC and 13 colon cell lines to study the prevalence of PIK3CA mutations in MSI cases, PTEN expression in CRC and possibility of therapeutic targeting of this set of patients. PIK3CA mutations were found in four of the cell lines tested and 51 colorectal carcinomas (12.2%). Three of these four mutated cell lines were MSI. PTEN was inactivated in 66.1% of the CRC. Furthermore, we observed a strong association between PIK3CA mutations and MSI status (P=0.0046) while PTEN loss was more frequent in microsatellite stable (MSS) CRC (P=0.043). A high prevalence of genetic alterations in PI3K/AKT pathway in Saudi cohort of CRC, predominance of PIK3CA mutations in the MSI subgroup and their possible involvement in development/progression of this subset of CRC are some of the significant findings of our study.

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Author notes

  1. J Abubaker and P Bavi: These two authors contributed equally to this work.

Authors and Affiliations

  1. Department of Human Cancer Genomic Research, King Fahad National Center for Children's Cancer and Research, Riyadh, Saudi Arabia

    J Abubaker, P Bavi, S Al-Harbi, M Ibrahim, A K Siraj, S Uddin & K S Al-Kuraya

  2. Department of Colorectal Surgery, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia

    N Al-Sanea, A Abduljabbar, L H Ashari & S Alhomoud

  3. Department of Pathology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia

    F Al-Dayel

Authors
  1. J Abubaker
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  2. P Bavi
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  3. S Al-Harbi
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  4. M Ibrahim
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  5. A K Siraj
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  6. N Al-Sanea
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  7. A Abduljabbar
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  8. L H Ashari
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  9. S Alhomoud
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  10. F Al-Dayel
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  11. S Uddin
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  12. K S Al-Kuraya
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Corresponding author

Correspondence to K S Al-Kuraya.

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Abubaker, J., Bavi, P., Al-Harbi, S. et al. Clinicopathological analysis of colorectal cancers with PIK3CA mutations in Middle Eastern population. Oncogene 27, 3539–3545 (2008). https://doi.org/10.1038/sj.onc.1211013

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  • DOI: https://doi.org/10.1038/sj.onc.1211013

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