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Poster display session

2056 - Clinical Utility of Quasi-Monomorphic Variation Range (QMVR) on the Determination of Microsatellite Instability (MSI) Status in Patients (pts) with Colorectal Cancer (CRC): GI-SCREEN-CRC-MSI sub-study 01

Date

09 Sep 2017

Session

Poster display session

Topics

Translational Research;  Colon and Rectal Cancer

Presenters

Wataru Okamoto

Citation

Annals of Oncology (2017) 28 (suppl_5): v158-v208. 10.1093/annonc/mdx393

Authors

W. Okamoto1, H. Bando2, T. Fukui3, T. Yamanaka4, K. Akagi5, T. Yoshino2

Author affiliations

  • 1 Biobank Translational Research Support Section, Translational Research Management Division, Clinical Research Support Office, National Cancer Center Hospital East, 277-8577 - Kashiwa/JP
  • 2 Department Of Gastroenterology And Gastrointestinal Oncology, National Cancer Center Hospital East, 277-8577 - Kashiwa/JP
  • 3 Biomedical Business Department, FALCO Biosystems, 613-0036 - Kyoto/JP
  • 4 Department Of Biostatistics, Yokohama City University School of Medicine, 236-0004 - Yokohama/JP
  • 5 Division Of Molecular Diagnosis, Saitama Cancer Center, Saitama/JP
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Resources

Abstract 2056

Background

The current analysis for the determination of Microsatellite Instability (MSI) status in tumors requires matched normal DNA as references. Five quasi-monomorphic markers (NR-21, BAT-26, BAT-25, NR-24, and MONO-27) of the Promega panel are known to have few variant alleles in both Caucasian and Asian patients (pts). For that reason, the peak of PCR products from normal DNA are confined within the Quasi-Monomorphic Variation Range (QMVR), of which Japanese pts with metastatic colorectal cancer (mCRC) are almost the same as those of Caucasian (Patil DT, et al., 2012 and Bando H. ASCO-GI 2017).

Methods

The purposes of this clinical evaluation study are to establish the QMVR in Japanese pts with mCRC and to evaluate the clinical utility of the QMVR in the determination of MSI status without matched normal DNA. The primary endpoint is the concordance of MSI status between the standard method using DNA from tumor plus matched normal samples and testing method using DNA from only tumor samples. The new MSI kits including the Promega MSI panel were manufactured under the Quality Management System (QMS) for in vitro diagnostics (IVDs). As the decision algorithm, tumors exhibiting 2 or more markers outside the QMVR were classified as MSI-H, cases with 1 marker or without any marker outside the QMVR were classified as non MSI-H (MSI-L/MSS).

Results

Totally 435 pts with mCRC were enrolled. Median age was 66 years old and 248 (57.0%) pts were male. 368 (84.6%) primary and 67 (15.4%) metastatic specimens were used. There were 11 (2.5%) MSI-H cases by the standard method and the sensitivity of the testing method was 100% while the specificity of the testing method was also 100%. Thereby the two methods was completely concordant. Among the five quasi-monomorphic markers, 3 and 2 cases were discordant in NR-21 and BAT-25, respectively. In BAT-26, NR-24, and MONO-27, all cases were completely concordant.

Conclusions

By using the QMVR, MSI status of Japanese pts with mCRC can be determined without matched normal DNA, and the QMVR might be applicable to Caucasian pts.

Clinical trial identification

UMIN000024144 Release date: March 26, 2016

Legal entity responsible for the study

FALCO Biosystems Co, Ltd.

Funding

FALCO Biosystems Co, Ltd.

Disclosure

W. Okamoto: Research funding from MSD. T. Fukui: Employment with FALCO Biosystems Co, Ltd. T. Yoshino: Research funding from GlaxoSmithKline K.K. and Boehringer-Ingelheim GmbH. All other authors have declared no conflicts of interest.

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