Amongst these, some were predicted potentially deleterious by in silico algorithms and occurred in DNA repair genes, including BRCA1, BRCA2, MLH1, PMS2 and RAD54L. Coincidentally, tumours of patients from these two histological subtypes exhibited higher incidences of karyotypic aberrations, suggesting plausible roles for DNA repair pathway deficiency. This evidence concerns the gene PMS2 and neoplasm.