Bilbao et al. [16] screened the MCPH1 gene for mutations within mononucleotide coding tracts in exons 4, 5 and 8 in 41 MSI (microsatellite instability)-positive and 62 MSI-negative endometrial tumors and found mutations in only five MSI-positive tumors. The gene discussed is MCPH1; the disease is endometrium neoplasm.