DDR1 and neoplasm: While, as expected, Ki67 expression was significantly higher in TP53‐mutant tumours compared to those tumours with a wild‐type TP53 gene (p = 0.0024, data not shown), we noted that DDR1 expression was negatively correlated with Ki67 expression in TP53 wild‐type tumours, but not in TP53‐mutant tumours (Figure 4C).