DDR2 and neoplasm: As depicted in Fig. 4A,B, the tumour growth rate of +DDR1b/+COL1 and +DDR2/+COL1 tumours was significantly faster than that of +DDR tumours without COL1 (p = 0.011 for DDR1b and p = 0.007 for DDR2) (summarized also in Supplementary Table 1).