Background
Approximately 15% of colorectal cancers (CRC) display high level of microsatellite instability (MSI-H) due to either hereditary predisposition (Lynch syndrome, LS) or somatic hypermethylation of MLH1. They carry a significantly different prognosis and responses to treatments compared with microsatellite stable (MSS) or low microsatellite instability (MSI-L) CRC. We
investigated therapeutically important biomarkers, which may underlie different treatment options for CRC.