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Risk of metachronous colorectal cancer after colectomy for first colon cancer in Lynch syndrome: multicenter retrospective study in Japan

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Abstract

Background

We evaluated the risk of metachronous colorectal cancer (mCRC) and explored the optimal extent of colectomy in patients with Lynch syndrome (LS) and first colon cancer (fCC) in Japan, where the extent of colectomy for colon cancer (CC) is shorter than that in Western countries.

Methods

The clinicopathologic and survival data of patients with LS who developed CC were collected from a nationwide database and analyzed retrospectively. The cumulative incidence of mCRC after actual segmental colectomy was compared with that of mCRC when more extensive colectomy was assumed.

Results

There were 142 eligible patients (65 female). The median age at fCC surgery was 46.5 (range: 14–80) years. The cumulative incidence of 5-, 10-, and 20-year mCRC rate was 13.4%, 20.8%, and 53.6%, respectively. The incidence was higher in the left-sided group (splenic flexure to rectosigmoid colon, n = 54) than in the right-sided group (cecum to transvers colon, n = 88) (66.3% vs. 45.3% in 20 years, P < 0.01). Assuming that all patients would have undergone hemicolectomy or total colectomy, the estimated mCRC risk was 41.5% and 9.4% (P < 0.01, vs. actual procedures), respectively. The 20-year overall survival rate of all the patients was 83.3% without difference by fCC sidedness (P = 0.38).

Conclusions

To reduce the incidence of mCRC, patients with genetically diagnosed LS and fCC, preferentially located in the left-sided colon, may need to undergo more extended colectomy than that usually performed in Japan. However, such extended colectomy should be counterbalanced with favorable overall survival and actual risk of mCRC development.

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Acknowledgements

We thank all study participants and staff for their contributions to this project.

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Authors

Contributions

All authors contributed to the study’s conception and design. KC, YM, HI, TY, NT, and KT developed the main concept and designed the study. KC wrote the first draft of the manuscript and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Kenichi Chikatani.

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The authors declare that they have no conflicts of interest.

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Takeshi Nakajima: Affiliation has been moved to Department of Medical Ethics and Medical Genetics, Kyoto University School of Public Health, Kyoto, Japan.

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Chikatani, K., Ishida, H., Mori, Y. et al. Risk of metachronous colorectal cancer after colectomy for first colon cancer in Lynch syndrome: multicenter retrospective study in Japan. Int J Clin Oncol 28, 1633–1640 (2023). https://doi.org/10.1007/s10147-023-02412-z

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  • DOI: https://doi.org/10.1007/s10147-023-02412-z

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