Journal of Surgery Concepts & Practice >

2024 , Vol. 29 >Issue 02: 148 - 155

DOI: https://doi.org/10.16139/j.1007-9610.2024.02.10

Original article

Consistency analysis of mismatch repair protein expression and microsatellite stability in colorectal cancer

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  • Department of Outpatient, Fudan University Shanghai Cancer Center; Department of Oncology, Shanghai Medical College, Fudan University; b. Department of Endoscopy, Fudan University Shanghai Cancer Center; Department of Oncology, Shanghai Medical College, Fudan University; c.Department of Colorectal Surgery, Fudan University Shanghai Cancer Center; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China

Received date: 2024-02-24

  Online published: 2024-07-01

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Abstract

Objective To investigate the consistency between mismatch repair proyeins expressions detected by immunohistochemistry (IHC) and microsatellite instability(MSI) identified by next-generation sequencing (NGS), and evaluate the correlation of these results with the clinical characteristics of Chinese colorectal cancer (CRC). Methods Using IHC and NGS to identify mismatch repair (MMR) and MSI status in CRC, and assessing the consistency between these different detection methods. Results The concordance rate of MSI status detected by IHC and NGS was 98.36%, indicating good agreement (Kappa=0.856). Certain pathogenic or likely pathogenic germline variants were present in the pMMR/MSI-H subtype. The co-deficiency of MLH1 and PMS2 was most common in the dMMR/MSS subtype. Patients with inconsistent typing were more likely to have early-onset right-sided colon cancer (P<0.01) and the tumor with relatively poor differentiation. Conclusions The consistency of MSI status detected by IHC and NGS is very high, 98% or more. To avoid the misdiagnosis of MSI status affecting clinical decision-making for treatment plans, it is imperative to ensure the accuracy of MSI analysis, particularly in poorly differentiated early-stage right-sided colon cancers.

Key words： Colorectal cancer(CRC); Mismatch repair(MMR); Microsatellite instability(MSI); Next-generation sequencing(NGS); Immunohistochemistry(IHC)

Cite this article

ZHU Hui, CAI Jidong, LI Minghan, YANG Wentao, XU Ye . Consistency analysis of mismatch repair protein expression and microsatellite stability in colorectal cancer[J]. Journal of Surgery Concepts & Practice, 2024 , 29(02) : 148 -155 . DOI: 10.16139/j.1007-9610.2024.02.10

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