KRAS and colorectal carcinoma: At the species level, Roseburia sp 11SE38, Clostridium bolteae, Harryflintia acetispora, Alistipes sp cv1, et al. were observed to have a higher abundance in CRC patients with KRAS mutations while Bifidobacterium longum, Bifidobacterium dentium, and Bifidobacterium kashiwanohense had a higher abundance in patients without this mutation (Fig. 5a).