ROS1-IN-1 (Compound 31) is a highly effective and specific inhibitor of the ROS1 kinase, displaying a remarkable inhibitory concentration (IC 50) of 0.097 μM [1].
PF-06463922 acetate is a potent, selective brain-penetrable inhibitor of both anaplastic lymphoma kinase (ALK) and c-ros Oncogene 1 (ROS1) with strong activity against all known ALK and ROS1 mutants identified in patients with crizotinib-resistant disease. PF-06463922 is in clinical trials for the treatment of non–small cell lung cancer (NSCLC).