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ALK Inhibitor TPX-0131 is an orally available, compact macrocyclic structure-based inhibitor of the receptor tyrosine kinase (RTK) anaplastic lymphoma kinase (ALK), with potential antineoplastic activity. Upon oral administration, ALK inhibitor TPX-0131 binds within the ATP binding boundary and inhibits ALK wild-type tyrosine kinase, ALK fusion proteins and numerous ALK point mutations, including acquired resistance mutations, such as the solvent front mutation (SFM) G1202R and compound mutations L1196M/G1202R, L1198F/G1202R, L1196M/L1198F, and C1156Y/G1202R. Inhibition of ALK leads to the disruption of ALK-mediated signaling and the inhibition of cell growth in ALK-expressing tumor cells. ALK belongs to the insulin receptor superfamily and plays an important role in nervous system development. ALK is not expressed in healthy adult human tissue but ALK dysregulation and gene rearrangements are associated with a variety of tumor cell types. Compared to other ALK inhibitors, TPX-0131 is able to inhibit ALK resistance mutations associated with acquired resistance to other ALK inhibitors.