- History or clinical evidence of central nervous system (CNS) metastases or leptomeningeal carcinomatosis, except for individuals who have previously-treated CNS metastases, are asymptomatic, and have had no requirement for steroids or anti-seizure medications for 3 months prior to first dose of study drug; screening with CNS imaging studies (CT or magnetic resonance imaging [MRI]) is required only if clinically indicated or if the subject has a history of CNS metastases