- For Cohorts A and B, documented tumor progression (based on radiological imaging) after receiving at least one prior approved platinum-based chemotherapy regimen for advanced stage/metastatic NSCLC. An alternate chemotherapeutic agent/regimen is an acceptable substitute in the event that the subject was intolerant to, or ineligible to receive platinum based chemotherapy. Subjects enrolled in Cohort B cannot have more than 3 prior systemic treatments for advanced stage/metastatic NSCLC (neoadjuvant and adjuvant therapies are not counted in number of prior regimens and maintenance therapy is not counted as a separate regimen). Subjects in Cohort C will be required to have not received prior systemic anti-cancer therapies for metastatic disease (i.e., dabrafenib/trametinib will be 1st line treatment for metastatic disease);