Adverse events (Event number; Type; Frequency: Yes, No; Intensity: Mild, Moderate, Severe, Severe life-threatening disability and death related to adverse events; Duration: days or hours; Causal relationship: remote, possible, likely, very likely; Result: Fully resolved Resolved with sequelae, in improving conditions, conditions still present and unchanged, worsening, Death; Treatment indicated: type and dosage of medication, treatment time). Measuring time: 30 minutes and hour, 2, 4, 8 and 12 hours after administration of each dose of CIGB-300. Percent maximum uptake (maximum percentage is the fraction of injected activity that is captured or incorporated by an organ or tumor and is determined as: Activity (tmax) * 100/Actividad Injected, where tmax is the time it reaches the maximum incorporation). Measuring time: in the first 5, 15 and 30 minutes later in the hours 1, 2, 3, 5, 7, 12, 16 and 24, after administration of the 1st and 5th cycle CIGB-300, depending on the dose. Fraction of incorporation (is the total fraction of injected activity that is incorporated into an organ or tumor and is determined as total activity incorporated / injected activity). Measuring time: in the first 5, 15 and 30 minutes later in the hours 1, 2, 3, 5, 7, 12, 16 and 24, after administration of the 1st and 5th cycle CIGB-300, depending on the dose. Fraction of elimination (total fraction of injected activity that is eliminated by an organ or tumor and is determined as total activity eliminated / injected activity). Measuring time: in the first 5, 15 and 30 minutes later in the hours 1, 2, 3, 5, 7, 12, 16 and 24, after administration of the 1st and 5th cycle CIGB-300, depending on the dose. Average time biological uptake (is the average time that the activity taken to an organ or tumor increases to half of its value and is determined as: ln (2)/k, where k is the constant of biological incorporation). Measuring time: in the first 5, 15 and 30 minutes later in the hours 1, 2, 3, 5, 7, 12, 16 and 24, after administration of the 1st and 5th cycle CIGB-300, depending on the dose. Average time biological removal (is the average time that the activity taken to an organ or tumor decreased to half its value and is determined as: ln (2)/k where k is the biological elimination constant). Measuring time: in the first 5, 15 and 30 minutes later in the hours 1, 2, 3, 5, 7, 12, 16 and 24, after administration of the 1st and 5th cycle CIGB-300, depending on the dose.