Abstract:
:The frequency of deficient mismatch repair (dMMR) or microsatellite instability-high colorectal cancer (CRC) is estimated to be ~15% of all patients with CRC; however, the patients reported are limited to surgical cases, and the frequency of patients exhibiting stage 0 disease is not considered, despite the currently increasing use of endoscopic techniques to cure a number of these patients. In the present study, the DNA MMR status for stage 0 patients with CRC treated using endoscopic submucosal dissection or endoscopic mucosal resection was analyzed via immunohistochemical staining of four types of proteins, namely MutL homolog 1 (MLH1), MutS homolog 2 (MSH2), MSH6 and PMS1 homolog 2 MMR system component, in adenocarcinoma specimens. Notably, none of the endoscopically resected specimens exhibited dMMR among the 41 patients diagnosed with stage 0 CRC. Since tumors harboring dMMR progress more rapidly than tumors with chromosomal instability, the present results highlight the importance of tumor resection during very early phases that exist before the promoter region of MLH1 becomes hypermethylated, resulting in a loss of DNA MMR function.
journal_name
Oncol Lettjournal_title
Oncology lettersauthors
Sugiyama T,Iwaizumi M,Kaneko M,Tani S,Yamade M,Hamaya Y,Furuta T,Miyajima H,Osawa S,Baba S,Maekawa M,Sugimoto Kdoi
10.3892/ol.2020.11799subject
Has Abstractpub_date
2020-09-01 00:00:00pages
2435-2441issue
3eissn
1792-1074issn
1792-1082pii
OL-0-0-11799journal_volume
20pub_type
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