Antineoplastic Agents, Phytogenic/administration & dosage; Antineoplastic Agents, Phytogenic/therapeutic use; Antineoplastic Agents/administration & dosage; Antineoplastic Agents/therapeutic use; Antineoplastic Combined Chemotherapy Protocols/administration & dosage; Antineoplastic Combined Chemotherapy Protocols/therapeutic use; Astrocytoma/drug therapy; Brain Neoplasms/drug therapy; Carboplatin/administration & dosage; Carboplatin/therapeutic use; Etoposide/administration & dosage; Etoposide/therapeutic use; Glioblastoma/drug therapy; Neoplasm Recurrence, Local/drug therapy; Adolescent; Adult; Aged; Antineoplastic Agents/adverse effects; Antineoplastic Agents, Phytogenic/adverse effects; Antineoplastic Combined Chemotherapy Protocols/adverse effects; Astrocytoma/mortality; Brain Neoplasms/mortality; Carboplatin/adverse effects; Child; Child, Preschool; Etoposide/adverse effects; Female; Glioblastoma/mortality; Humans; Male; Middle Aged; Neoplasm Recurrence, Local/mortality; Outcome Assessment, Health Care; Survival Rate