Asian Pacific Journal of Cancer Prevention

  • 제17권4호
  • /
  • Pages.1917-1923
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  • 2016
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  • 1513-7368(pISSN)
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  • 2476-762X(eISSN)
아시아태평양암예방학회 (Asian Pacific Journal of Cancer Prevention)
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Screening for Lynch Syndrome in Young Colorectal Cancer Patients from Saudi Arabia Using Microsatellite Instability as the Initial Test

  • Alqahtani, Masood (School of Surgery, University of Western Australia) ;
  • Grieu, Fabienne (Department of Anatomical Pathology, Pathwest Laboratory Medicine, Queen Elizabeth II Medical Centre) ;
  • Carrello, Amerigo (Department of Anatomical Pathology, Pathwest Laboratory Medicine, Queen Elizabeth II Medical Centre) ;
  • Amanuel, Benhur (Department of Anatomical Pathology, Pathwest Laboratory Medicine, Queen Elizabeth II Medical Centre) ;
  • Mashour, Miral (Department of Pathology and Laboratory Medicine, King Fahad Specialist Hospital-Dammam) ;
  • Alattas, Rabab (Department of Pathology and Laboratory Medicine, King Fahad Specialist Hospital-Dammam) ;
  • Al-Saleh, Khalid (College of Medicine, Anatomical Pathology, Adult Oncology, King Khaled University Hospital King Saud University) ;
  • Alsheikh, Abdulmalik (College of Medicine, Anatomical Pathology, Adult Oncology, King Khaled University Hospital King Saud University) ;
  • Alqahtani, Sarah (Primary Health Care Department of Eastern Province, Ministry of Health) ;
  • Iacopetta, Barry (School of Surgery, University of Western Australia)
  • 발행 : 2016.06.01
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초록

Background: Lynch Syndrome (LS) is a familial cancer condition caused by germline mutations in DNA mismatch repair genes. Individuals with LS have a greatly increased risk of developing colorectal cancer (CRC) and it is therefore important to identify mutation carriers so they can undergo regular surveillance. Tumor DNA from LS patients characteristically shows microsatellite instability (MSI). Our aim here was to screen young CRC patients for MSI as a first step in the identification of unrecognized cases of LS in the Saudi population. Materials and Methods: Archival tumor tissue was obtained from 284 CRC patients treated at 4 institutes in Dammam and Riyadh between 2006 and 2015 and aged less than 60 years at diagnosis. MSI screening was performed using the BAT-26 microsatellite marker and positive cases confirmed using the pentaplex MSI analysis system. Positive cases were screened for BRAF mutations to exclude sporadic CRC and were evaluated for loss of expression of 4 DNA mismatch repair proteins using immunohistochemistry. Results: MSI was found in 33/284 (11.6%) cases, of which only one showed a BRAF mutation. Saudi MSI cases showed similar instability in the BAT-26 and BAT-25 markers to Australian MSI cases, but significantly lower frequencies of instability in 3 other microsatellite markers. Conclusions: MSI screening of young Saudi CRC patients reveals that approximately 1 in 9 are candidates for LS. Patients with MSI are strongly recommended to undergo genetic counselling and germline mutation testing for LS. Other affected family members can then be identified and offered regular surveillance for early detection of LS-associated cancers.

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참고문헌

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피인용 문헌

  1. A new hereditary colorectal cancer network in the Middle East and eastern mediterranean countries to improve care for high-risk families pp.1573-7292, 2017, https://doi.org/10.1007/s10689-017-0018-6
  2. Screening for Lynch syndrome in young Saudi colorectal cancer patients using microsatellite instability testing and next generation sequencing pp.1573-7292, 2017, https://doi.org/10.1007/s10689-017-0015-9
  3. Molecular characteristics of colorectal cancer in a Middle Eastern population in a single institution vol.38, pp.4, 2018, https://doi.org/10.5144/0256-4947.2018.251