Abstract
Background
Colorectal polyp burden is crucial for the management of patients with familial adenomatous polyposis (FAP). However, accurate evaluation of polyp burden is difficult to standardize. This study aimed to examine the possible utility of genotype-oriented management of colorectal neoplasms in patients with FAP.
Methods
Clinicopathological data from genetically proven patients with FAP was analyzed using the database of a nationwide retrospective Japanese multicenter study. The cumulative incidence of CRC was evaluated between different genotype groups. Genotype-1 were defined as germline variants on attenuated FAP-associated regions (codons 1–177, alternative splice site of exon 10 (codon 312), 1581–2843) and Genotype-2 as the other variants. Weibull and Joinpoint analyses were performed to determine the annual percentage changes in CRC risk.
Results
Overall, 69 men and 102 women were included. Forty-eight patients underwent colorectal resection for the first CRC, and five patients underwent resection for first cancer in the remnant anorectal segment after prophylactic surgery. The 70-year cumulative incidence of CRC in all patients was 59.3%. Patients with Genotype-1 (n = 23) demonstrated a lower risk of CRC stages II–IV than those with Genotype-2 (n = 148, P = 0.04). The risk of stage II–IV CRC was estimated to increase markedly at the age of 49 years in the Genotype-1 patients and 34 years in the Genotype-2 patients, respectively.
Conclusions
Different interventional strategies based on genotypes may be proposed for the clinical management of patients with FAP. This policy needs to be validated in further prospective studies focusing on long-term endoscopic intervention and optimal age at prophylactic (procto)colectomy.
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Acknowledgements
We would like to express our gratitude to Dr. Takeo Iwama and Dr. Kazushige Kawai for their useful advice.
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HI, AC, NT, AT, KS, KA, KT, TN, and YA designed and conceptualized the study. YM, NC, TI, KA, KC, YT, MK, SS, MT, and SN collected data. YM, HI, and TY analyzed the data. HI, YM, and TY interpreted data and drafted the manuscript. TY, YM, and HI revised the APC variants. All the authors have read and approved the final manuscript.
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Mori, Y., Ishida, H., Chika, N. et al. Usefulness of genotyping APC gene for individualizing management of patients with familial adenomatous polyposis. Int J Clin Oncol 28, 1641–1650 (2023). https://doi.org/10.1007/s10147-023-02419-6
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DOI: https://doi.org/10.1007/s10147-023-02419-6