For example, Bonneville et al. [208] found that only 0.3% (3/909; 95% CI: 0.1–1.0%) of glioblastoma were MMR deficient using MSI analysis, but Tepeoglu et al. [233] found, in contrast, that 9.9% (7/71; 95% CI: 4.1–19.3%) were MMR deficient using IHC. Here, MRC1 is linked to glioblastoma.