Gliomas are the most frequent and the most aggressive type of brain cancer. In the clinics, in order to choose a treatment for the patient, clinicians divide these tumors in 4 grades, according to the severity of the cancer: grade I, II, III or IV. Now researchers suggest a more accurate classification, with seven subtypes of tumors. Each of them defines a specific prognosis and also relate to different responses to treatment. The new classification results from the broadest analysis of brain tumors done to date, by scientists from 6 countries. 1,122 samples from TCGA (The Cancer Genome Atlas) Biobank were used in the study. The research was coordinated by Houtan Noushmehr, from University of Sao Paulo - USP (Brazil); Antonio Iavarone, from Columbia University (United States); and Roel Verhaak, from MD Anderson Cancer Center (United States). Analysis included: DNA methylation, copy number of genes, genetic mutations, RNA expression, codeletion of 1p19q chromosome, telomere length and I
