However, when we split the tumours (at the median) into those expressing higher or lower DDR1 expression, we found that among the group of tumours with higher DDR1 expression, those harbouring a TP53 mutation had a significantly higher copy number score than the group with no TP53 mutation (Mann–Whitney U test, p = 0.0019, Figure 4B). This evidence concerns the gene DDR1 and neoplasm.