Erschienen in:
07.08.2015 | Original Article
Lower prevalence of Lynch syndrome in colorectal cancer patients in a Japanese hospital-based population
verfasst von:
Kensuke Kumamoto, Hideyuki Ishida, Okihide Suzuki, Yusuke Tajima, Noriyasu Chika, Koki Kuwabara, Keiichiro Ishibashi, Katsuharu Saito, Koji Nagata, Hidetaka Eguchi, Junichi Tamaru, Takeo Iwama
Erschienen in:
Surgery Today
|
Ausgabe 6/2016
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Abstract
Purpose
The aim of this study was to investigate the prevalence of Lynch syndrome among Japanese patients with surgically resected colorectal cancer at a single institution.
Methods
Of 616 colorectal cancer patients who underwent surgical operation in our institution from January 2005 to August 2010, immunohistochemistry analyses for mismatch repair proteins (MLH1, MSH2, MSH6, and PMS2) and microsatellite instability (MSI) testing for surgically resected, formalin-fixed paraffin-embedded colorectal cancer specimens from 138 colorectal cancer patients under 60 years of age were undertaken. Hypermethylation of the MLH1 promoter and BRAF mutation were analyzed where necessary.
Results
Seven patients were identified as candidates for genetic testing by mismatch repair protein loss (n = 7) or MSI-H (n = 6). Methylation of MLH1 was detected in one case. Three patients were diagnosed with Lynch syndrome, comprising 2.2 % of the total colorectal cancer patients younger than 60 years of age.
Conclusion
The prevalence of Lynch syndrome among hospital-based diagnosed cancer patients may therefore be lower than expected in Japan compared with Western populations.