EGFR and inflammatory bowel disease: Cooperating with the gut microbiome, the Vitamin D-VDR axis plays the key roles in intestine inflammation, certainly in IBD, through multiple signaling pathways including NF-κB, Mitogen-activated protein kinase (MAPK), Toll-like receptor (TLR), epidermal growth factor receptor (EGFR), etc. (Wu et al. 2010; Yoon and Sun 2011).