Cancer is a great challenge for medical sciences. The fight against this disease is a priority for the World Health Organization (WHO) since 2005. The annual international incidence for primary tumors of the central nervous system (CNS) and spinal cord varies according to the sources and the series. As an average, it is between 4.2 and 12.8 cases per 100 000 inhabitants. Only in the USA, 119 674 malignant brain or spinal cord primary tumors were diagnosed in the period from 2010 to 2014, which represented an annual incidence between 7.1 and 7.4 per 100 000 inhabitants. In the year 2017, it was published that of 23800 new cases of malignant brain tumors and others of the CNS diagnosed, 16700 died of this cause. The mortality rate of the malignant primary brain tumors is close to the incidence rate, circumstance that highlights the great aggressiveness of those tumors. They represent 2% of cancer deaths.