Laboratory of Clinical Chemistry;
University of Ioannina Medical School;
45500 Ioannina;
Greece;
Laboratory of Biochemistry;
University Hospital of Ioannina;
Leoforos S.Niarchou;
45500 Ioannina;
Greece;
Hepatogastroenterology Unit of Internal Medicine;
University Hospital of Ioannina;
Leoforos S.Niarchou;
45500 Ioannina;
Greece;
Laboratory of Pathology;
University Hospital of Ioannina;
Leoforos S.Niarchou;
45500 Ioannina;
Greece;
Promoter methylation; Microsatellite instability; Human DNA mismatch repair gene mutator L homologue 1; O-6-methylguanine DNA methyltransferase; Cyclin-dependent kinase inhibitor 2A;