DDR2 and cancer: To further confirm the FOXQ1-DDR2 or SNAI1-DDR2 axis in cancer cells, we knocked down the FOXQ1 gene in Hs.578t cells, and the SNAIL1 gene in MDA MB157 cells since each of these cell lines displayed high expression of either FOXQ1 or SNAIL1 with comparatively low expression of the other.