FN1 and colorectal carcinoma: In addition, the abundance of Lachnospiraceae_NK4A136_group with elevated expression in the CRC + Fn group was positively correlated with Odoribacter and Butyricicoccus with elevated expression in the CRC + Fn + Cys group, suggesting a reciprocal promotion of harmful bacteria between the CRC + Fn and CRC + Fn + Cys groups.