Abstract
Background
Lynch syndrome (LS) increases the risk of many types of cancer, mainly colorectal cancer (CRC). The purpose of this study was to assess the prevalence of mismatch repair (MMR) deficiency in patients under the age of 50 with advanced adenomatous polyps, aiming at an early diagnosis of LS.
Methods
This retrospective, cross-sectional study included eligible patients with advanced adenomas diagnosed ≤ 50 years of age registered between April 2014 and February 2017 at three pathology centers in Mashhad. Pathological records were reviewed, and colon tissue specimens were analyzed by immunohistochemistry (IHC) staining to identify proteins which serve as markers for LS as they are related to loss of MMR gene (MLH1, MSH2, MSH6, and PMS2) expression.
Results
Of 862 consecutive patients, a total of 50 adenomas (54% males, 46% females of mean age 41.24 ± 6.5) met the eligibility criteria. Of the adenomas examined, 20 (40%) had a tubulovillous component, 34 (68%) had high-grade dysplasia, and 30 (60%) had were larger than 10 mm protrusions. None of the patients had loss of MMR protein expression.
Conclusion
No individual with MMR genetic disorder was identified by IHC screening of early-onset advanced colorectal adenomas. This strategy is therefore not an effective strategy for detecting MMR mutation carriers.
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Availability of Data and Material
Data will be available upon request.
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Acknowledgements
The authors would like to thank all study participants.
Funding
This study was funded by Mashhad University of Medical Sciences (Grant number 951047).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Benyamin Hoseini, Ladan Goshayeshi, and Mahla Rahmani Khorram.
The first draft of the manuscript was written by Mahla Rahmani Khorram and Fatemeh Maghool and then edited by Benyamin Hoseini. All authors commented on previous versions of the manuscript and approved the final manuscript.
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Ethical Approval and Consent to Participate
Ethical approval was obtained from the ethics committee of Mashhad University of Medical Sciences (IR.MUMS.fm.REC.1396.240), and the study has been performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Informed consent was obtained from all participants before interviewing and/or testing.
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Khorram, M.R., Goshayeshi, L., Maghool, F. et al. Prevalence of Mismatch Repair-Deficient Colorectal Adenoma/Polyp in Early-Onset, Advanced Cases: a Cross-Sectional Study Based on Iranian Hereditary Colorectal Cancer Registry. J Gastrointest Canc 52, 263–268 (2021). https://doi.org/10.1007/s12029-020-00395-y
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DOI: https://doi.org/10.1007/s12029-020-00395-y