MUC5AC and colorectal cancer: Rather, mucin degradation by A. muciniphila can promote intestinal inflammation and pathogen colonization (Ganesh et al. 2013; Ng et al. 2013), and its colonization is linked to tumorigenesis in the FabplCre;Apc15lox/+ colorectal cancer mouse model (Dingemanse et al. 2015).