Four of the chordoma cell lines, U‐CH1, U‐CH7, UM‐Chor1 and MUG‐Chor1, responded to EGFR inhibition with EC50 concentrations < 1 μm, whereas U‐CH2, U‐CH10 and JHC7 were largely resistant (Table 3). This evidence concerns the gene EGFR and chordoma.