Concerning DDR kinase inhibitors, the compound 7f is representative of a range of 2-amino-2,3-dihydro-1H-indene-5-carboxamide derivatives; compounds 2a, 4a, and 4b belong to a family of pyrazolourea-containing compounds; and DDR1-IN-1 and DDR1-IN-2 exhibit notable inhibitory effects on DDR1 and DDR2 kinase activity in cancer (93–95). This evidence concerns the gene DDR1 and cancer.