KRAS and colorectal carcinoma: Mucinous colorectal carcinomas have higher incidence of high degree of microsatellite instability (MSI-H) (Kakar et al, 2004; Song et al, 2005; Ogino et al, 2006; Tanaka et al, 2006; Sarli et al, 2008), K-ras mutation (Zhang et al, 1999; Bazan et al, 2002; Ogino et al, 2006), BRAF mutation (Song et al, 2005; Li et al, 2006; Ogino et al, 2006; Tanaka et al, 2006), and less expression of p53 (Zhang et al, 1999; Ogino et al, 2006) than do non-mucinous colorectal cancer.