Agente antitumoral que contiene un derivado de citidina para administración continua intravenosa

Un agente antitumoral que contiene 1-(3-C-etinil-b-D-ribopentofuranosil)citosina o una sal de la misma para uso enel tratamiento del cáncer, que se ha de administrar a un paciente con cáncer por administración intravenosa continuaa una dosis de 1,30 a 8,56 mg/m2 en términos de 1-(3 -C-etinil-b-D-ribopentofuranosil)citosina por cada período deadministración de 2 a 336 horas. To provide a method for administering ECyd to a patient, which realizes a continuous therapy without expressing peripheral neurotoxicity caused by ECyd and which exhibits an excellent therapeutic effect with ensuring prolongation of the survival of the patient. The invention provides an antitumor agent containing ECyd or a salt thereof, which is administered to a cancer patient through continuous intravenous administration at a dose of 1.30 to 8.56 mg/m 2 as reduced to ECyd, for each administration period of 2 to 336 hours.