Idylla™ MSI FFPE Reference Set is intended as commutable, qualitative control material for microsatellite instability (MSI) markers in FFPE format based on human cell lines. It consists of MSI FFPE MSI-H control with all MSI markers at a frequency of 1x LOD for the Idylla™ MSI Test (refer to Idylla™ MSI Test package insert) and MSI FFPE MSS control with 0% frequency for all MSI markers. This Reference set enables monitoring of the performance, procedures and workflow of laboratory tests using FFPE in combination with the automatic workflow of the Idylla™ platform (Biocartis NV).