MRC1 and neoplasm: Out of 17 patients with a confirmed pathogenic variant in one of the MMR genes, 5 patients had available MSI and/or IHC testing results in tumor tissue (see Table 1), and in those 5 cases, MSI and/or IHC testing results perfectly correlated with NGS and/or MLPA results (lack of certain protein expression in tumor tissue corresponds to the mutation in the gene).