Brain metastasis development and poor survival associated with carcinoembryonic antigen (CEA) level in advanced non-small cell lung cancer: a prospective analysis by Castillo Patricia, Mendoza-Posada Daniel, Martinez Luis, Aviles-Salas Alejandro, Kuri Roberto, Saavedra-Perez David, Arrieta Oscar, Astorga Alma, Guzman Enrique, De la Garza Jaime

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