A significant population of Anaplastic Lymphoma Kinase (ALK) plus Non-small cell lung cancer patients exist that have progressed on or who were intolerant of second generation anaplastic lymphoma kinase inhibitor (e.g. ceritinib or alectinib). Brigatinib has demonstrated activity in patients who have progressed on crizotinib, but the activity of brigatinib in patients who have progressed on ceritinib, alectinib, or other second generation anaplastic lymphoma kinase inhibitors is unknown. Based on the preclinical data. 3, brigatinib is the only known anaplastic lymphoma kinase inhibitor with potent activity against known secondary anaplastic lymphoma kinase mutations suggesting it may retain activity as third-line treatment of anaplastic lymphoma kinase plus disease.