DDR1 and breast carcinoma: Similarly, the overexpression of DDR1 in MDA-MB-231 cells suppressed cell growth by restoring COL1/DDR1/BIK1-induced apoptosis, suggesting that the low expression level of full length DDR1 observed in basal-like breast carcinoma confers them with a capacity to resist collagen-induced cell growth suppression and apoptosis.