[Analysis of discordant results between multiplex fluorescence PCR-capillary electrophoresis for microsatellite instability (MSI) detection and immunohistochemistry (IHC) for mismatch repair (MMR) protein expression in gastrointestinal adenocarcinoma].

Colorectal adenocarcinoma demonstrated higher concordance between PCR-capillary electrophoresis and IHC than gastric adenocarcinoma.Discordant results require systematic evaluation including technical review, specimen quality control, and supplemental NGS analysis to resolve discrepancies.