Cetuximab, an anti-epidermal growth factor receptor (EGFR) antibody, has been widely used fortherapy of several kinds of malignant diseases. However, the anticancer effect is incomplete. The purpose of this study was to examine the synergism between the herbal drug, Polysaccharide K, and Cetuximab against gastrointestinal cancer cell lines in vitro and in vivo.Two gastrointestinal cancer...