Colorectal carcinomas from Middle East. Molecular and tissue microarray analysis of genomic instability pathways

Prashant P. Bavi, Jehad Abubaker, Zeenath D. Jehan, Naif A. Al-Jomah, Abdul K. Siraj, Sayer R. Al-Harbi, Valerie L. Atizado, Alaa S. Abduljabbar, Samar J. Alhomoud, Luai H. Ashari, Fouad H. Al-Dayel, Shahab Uddin, Khawla S. Al-Kuraya, Nasser A. Alsanea

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Abstract

Objectives: To evaluate the overall incidence of microsatellite instability (MSI), hereditary non polyposis colorectal cancer, and tumor supressor gene (TP53) mutations in Saudi colorectal carcinomas. Methods: We studied the MSI pathway in Saudi colorectal cancers (CRC) from 179 unselected patients using 2 methods, MSI by polymerase chain reaction, and immunohistochemistry detection of mutL homologs 1 and mutS homologs 2 proteins. The TP53 mutations were studied by sequencing exons 5, 6, 7, and 8. Results: Of the 150 colorectal carcinomas analysed for MSI, 16% of the tumors showed high level instability (MSI-H), 19.3% had low-level instability (MSI-L) and the ramaining 64% tumors were stable. Survival of the MSI-H group was better as compared to the MSI-L or microsatellite stable group (p=0.0217). In the MSI-H group, 48% were familial MSI tumors, which could be attributable to the high incidence of consaguinity in the Saudi population. The TP53 mutations were found in 24% of the cases studied. Conclusions: A high proportion of familial MSI cases and a lower incidence of TP53 mutations are some of the hallmarks of the Saudi colorectal carcinomas, which need to be explored further.

Original languageEnglish
Pages (from-to)75-80
Number of pages6
JournalSaudi Medical Journal
Volume29
Issue number1
Publication statusPublished - 1 Jan 2008

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Bavi, P. P., Abubaker, J., Jehan, Z. D., Al-Jomah, N. A., Siraj, A. K., Al-Harbi, S. R., Atizado, V. L., Abduljabbar, A. S., Alhomoud, S. J., Ashari, L. H., Al-Dayel, F. H., Uddin, S., Al-Kuraya, K. S., & Alsanea, N. A. (2008). Colorectal carcinomas from Middle East. Molecular and tissue microarray analysis of genomic instability pathways. Saudi Medical Journal, 29(1), 75-80.