Legal Information Sold for research purposes under agreement from Pfizer Inc. Biochem/physiol Actions Crizotinib (PF-02341066) is an ATP-competitive inhibitor of the receptor tyrosine kinases (RTKs) c-Met (hepatocyte growth factor receptor) and anaplastic lymphoma kinase (ALK). It is a highly specific inhibitor of c-Met and ALK among > 120 different RTKs surveyed. Crizotinib was recently approved for treatment of a subtype of nonsmall-cell lung cancer (NSCLC) with ALK fusion mutations.