SB505124 is a selective inhibitor of TGFβR for ALK4, ALK5 with IC50 of 129 nM and 47 nM in cell-free assays, respectively, also inhibits ALK7, but does not inhibit ALK1, 2, 3, or 6.

KRCA-0008 is a potent, selective ALK inhibitor with IC50 of 12 nM (wt ALK).

Ceritinib dihydrochloride is a selective, orally bioavailable and ATP-competitive inhibitor of ALK tyrosine kinase(IC50 of 200 pM), and also inhibits IGF-1R, InsR, and STK22D (IC50 values of 8, 7, and 23 nM, respectively).