KRAS and neoplasm: In the univariate analysis (Table 1), the risk of dying was significantly higher in patients with ECOG 1-2 Index (hazard ratio (HR), 2.49), N1-2 tumours (HR, 2.84), tumours of mucinous histologic type (HR, 2.54), low grade of differentiation (HR, 2.36), MT-KRAS tumours (HR, 2.18), and high PCI (HR, 7.43).