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Kim N, Kim SM, Lee BJ, Choi BI, Yoon HS, Kang SH, Kim SH, Joo MK, Park JJ, Kim C. Detection of Microsatellite Instability in Colorectal Cancer Patients With a Plasma-Based Real-Time PCR Analysis. Front Pharmacol 2021; 12:758830. [PMID: 34955830 PMCID: PMC8694627 DOI: 10.3389/fphar.2021.758830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 11/19/2021] [Indexed: 11/13/2022] Open
Abstract
A microsatellite instability (MSI) test is crucial for screening for HNPCC (Hereditary nonpolyposis colorectal cancer; Lynch syndrome) and optimization of colorectal cancer (CRC) treatment. Mismatch repair (MMR) deficiency is a predictor for good response of immune checkpoint inhibitors in various malignancies. In this study, we evaluated the results of a newly developed plasma-based real-time PCR kit for the detection of MSI in CRC patients. We assessed a peptide nucleotide acid (PNA) probe-mediated real-time PCR test (U-TOP MSI Detection Kit Plus) that determines MSI status by using amplicon melting analysis of five markers (NR21, NR24, NR27, BAT25, and BAT26) from plasma. Eighty-four CRC patients (46 dMMR and 38 pMMR) with colorectal cancer were analyzed. The concordance rate of MSI status assessment between the plasma kit and IHC was 63.0% in dMMR patients (29/46), but in the pMMR evaluation, a 100% (38/38) concordance rate was observed. In the evaluation of the performance of a custom tissue U-TOP MSI Detection Kit and plasma kit in 28 patients, sensitivity, specificity, PPV (positive predictive value) and NPV (negative predictive value) of plasma kit were 68.4, 100, 100, and 44.4%, respectively, with the tissue U-TOP MSI Detection Kit. Our results demonstrate the feasibility of a non-invasive and rapid plasma-based real-time PCR kit (U-TOP MSI Detection Kit Plus) for the detection of MSI in colorectal cancer.
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Affiliation(s)
- Namjoo Kim
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Sung Min Kim
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Beom Jae Lee
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
- *Correspondence: Beom Jae Lee,
| | - Byung il Choi
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Hee Sook Yoon
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Sang Hee Kang
- Department of Surgery, Korea University Guro Hospital, Seoul, South Korea
| | - Seung Han Kim
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Moon Kyung Joo
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Jong-Jae Park
- Department of Gastroenterology, Korea University Guro Hospital, Seoul, South Korea
| | - Chungyeul Kim
- Department of Pathology, College of Medicine, Korea University, Seoul, South Korea
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