Abstract
Background
Lynch-like syndrome (LLS) has recently been proposed as a third type of microsatellite instability (MSI) tumor after Lynch syndrome (LS) and sporadic MSI colorectal cancer (CRC) without either a germline variant of mismatch repair (MMR) genes or hypermethylation of the MLH1 gene. The present study aimed to clarify and compare the clinicopathological characteristics of LLS with those of the other MSI CRC subtypes.
Methods
In total, 2634 consecutive patients with CRC who underwent surgical resection and subsequently received universal tumor screening (UTS), including MSI analysis were enrolled between January 2008 and November 2019. Genetic testing was performed in patients suspected of having Lynch syndrome.
Results
UTS of the cohort found 146 patients with MSI CRC (5.5%). Of these, excluding sporadic MSI CRC, 30 (1.1%) had a diagnosis of LS, and 19 (0.7%) had no germline pathogenic variants of the MMR gene. The CRC type in the latter group was identified as LLS. LLS occurred significantly more often in young patients, was left-sided, involved a KRAS variant and BRAF wild-type, and had a higher concordance rate with the Revised Bethesda Guidelines than sporadic MSI CRC. No significant differences were observed in terms of the clinicopathological factors between LLS and LS-associated MSI CRC; however, LLS had a lower frequency of LS-related neoplasms compared with LS.
Conclusions
Distinguishing clinically between LS and LLS was challenging, but the incidence of neoplasms was higher in LS than in LLS, suggesting the need for different screening and surveillance methods for the two subtypes.
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Acknowledgements
The authors thank all the patients and their families and Mr. James R. Valera for his assistance with editing this manuscript.
Funding
This work was funded by Japan Society for the Promotion of Science (Grant nos. 21K07187 ,18K07314, 21K16437).
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Sakiko Nakamori: Acquisition of data, analysis and interpretation of data, drafting the article, final approval of the version to be published, and agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Misato Takao, Akinari Takao, Soichiro Natsume, Daisiuke Nakano, Kazushige Kawai, Takuhiko Inokuchi, Makiko Urushibara, Shin-ichiro Horiguchi, and Hideyuki Ishida: Acquisition of data, critically revising the article, final approval of the version to be published, and agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Takeru Iijima and Ekumi Kojika: Analysis and interpretation of data, critically revising the article, and agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Tatsuro Yamaguchi: Conception and design, acquisition of date, drafting the article, final approval of the version to be published, and agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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Approval of the research protocol by an Institutional Reviewer Board: The present study was approved by the ethical review board at Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital.
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Nakamori, S., Takao, M., Takao, A. et al. Clinicopathological characteristics of Lynch-like syndrome. Int J Clin Oncol 29, 944–952 (2024). https://doi.org/10.1007/s10147-024-02527-x
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DOI: https://doi.org/10.1007/s10147-024-02527-x