Department of Tumor Biology;
N.N.Petrov Institute of Oncology;
St.-Petersburg 197758;
Russia;
Department of Medical Genetics;
St.-Petersburg Pediatric Medical University;
Saint-Petersburg 194100;
Russia;
Department of Oncology;
I.I.Mechnikov North-Western Medical University;
Saint-Petersburg 191015;
Russia;
Colorectal cancer; Anti-epidermal growth factor receptor therapy; KRAS; NRAS; BRAF; HER2; Microsatellite instability; MUTYH; Hereditary cancer;