EGFR and cancer: The Src homology 2 domain-containing protein Grb2 binds to the tyrosine-phosphorylated ErbB1 molecule and activates at least three signalling pathways, Ras-Raf-MEK-ERK, phosphoinositide 3-kinase (PI3K)-AKT, and JAK-STAT signalling pathways, for cell proliferation, survival, and migration, and their continuous abnormal activation eventually leads to cancer cell tumourigenesis, invasiveness, and metastasis1–5,27–32.